chore(deps): update tiptap monorepo to v3.30.2

Signed-off-by: Sebastian <krupinski01@gmail.com>

.gitignore

@@ -22,6 +22,7 @@ coverage/
 .DS_Store
 .vscode/
 .idea/
+.ideas/
 
 # Logs
 *.log

lib/CompositionManager.php

@@ -5,23 +5,40 @@ declare(strict_types=1);
 namespace KTXM\Mail;
 
 use InvalidArgumentException;
+use KTXC\Module\ModuleManager;
+use KTXF\Event\EventDispatcherInterface;
+use KTXF\Mail\Collection\CollectionBaseInterface;
+use KTXF\Mail\Collection\CollectionRoles;
 use KTXF\Mail\Object\Address;
 use KTXF\Mail\Object\AddressInterface;
 use KTXF\Mail\Object\MessagePart;
 use KTXF\Mail\Object\MessagePropertiesMutableInterface;
+use KTXF\Mail\Service\ServiceEntityMutableInterface;
+use KTXF\Mail\Service\ServiceBaseInterface;
 use KTXF\Mail\Service\ServiceEntitySubmitInterface;
 use KTXF\Mail\Submission\EntitySubmitResult;
-use KTXF\Resource\Identifier\EntityIdentifierInterface;
+use KTXF\Resource\BinaryResource;
+use KTXF\Resource\Identifier\CollectionIdentifier;
+use KTXF\Resource\Identifier\EntityIdentifier;
 use KTXF\Resource\Identifier\ResourceIdentifier;
 use KTXF\Utile\UUID;
 use KTXM\Mail\Stores\CompositionStore;
 use KTXM\MailManager\Manager as MailManager;
+use KTXM\DocumentsManager\Manager as DocumentsManager;
+use Psr\Container\ContainerInterface;
+use RuntimeException;
+use Throwable;
 
 class CompositionManager {
 
+    private const DOCUMENTS_MODULE_HANDLE = 'documents_manager';
+
     public function __construct(
+        private readonly ContainerInterface $container,
+        private readonly ModuleManager $moduleManager,
         private readonly CompositionStore $compositionStore,
         private readonly MailManager $mailManager,
+        private readonly EventDispatcherInterface $events,
     ) {}
 
     public function stage(string $tenantId, string $userId, string $identifier, string $action, array $sender, array $message, ?string $source = null): array {
@@ -38,11 +55,19 @@ class CompositionManager {
             'sender' => $sender,
             'message' => $message,
             'attachments' => [],
+            'remote' => [
+                'status' => 'dirty',
+                'entity' => null,
+                'error' => null,
+            ],
         ];
 
-        $this->compositionStore->compositionSave($tenantId, $userId, $identifier, $snapshot);
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $saveComposition = function () use ($tenantId, $userId, $identifier, $action, $source, $snapshot): array {
+            if ($action !== 'forward') {
+                return $snapshot;
+            }
 
-        if ($action === 'forward') {
             $sourceIndentifier = ResourceIdentifier::fromString($source);
             if ($sourceIndentifier === null) {
                 throw new InvalidArgumentException('Invalid source identifier');
@@ -75,7 +100,7 @@ class CompositionManager {
                     data: $data,
                 );
                 // supplement the attachment metadata with source information
-                $meta['origin'] = 'source';
+                $meta['origin'] = 'message';
                 $meta['source'] = $source;
                 $meta['partId'] = $attachment->getId();
                 $meta['blobId'] = $attachment->getBlobId();
@@ -88,73 +113,300 @@ class CompositionManager {
                 $meta['size'] = $attachment->getSize() ?? $meta['size'];
                 $snapshot['attachments'][$meta['identifier']] = $meta;
             }
-            // update the snapshot with the staged attachments
-            $this->compositionStore->compositionSave($tenantId, $userId, $identifier, $snapshot);
-        }
 
-        return $snapshot;
+            return $snapshot;
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $snapshot = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $identifier,
+            $saveComposition,
+        ) ?? $snapshot;
+        $event = new CompositionSavedEvent($tenantId, $userId, $identifier, (int)$snapshot['revision']);
+        $this->events->dispatch($event);
+
+        $response = $snapshot;
+        unset($response['remote']);
+        return $response;
     }
 
     public function patch(string $tenantId, string $userId, string $identifier, array $data): array {
-        $composed = $this->compositionStore->compositionFetch($tenantId, $userId, $identifier);
+        $result = [];
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $patchComposition = function (?array $composed) use ($data, $identifier, &$result): ?array {
+            if ($composed === null) {
+                $result['disposition'] = 'error';
+                $result['error'] = [
+                    'type' => 'composition_not_found',
+                    'message' => 'Composition not found',
+                ];
+                return null;
+            }
 
-        if ($composed === null) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'composition_not_found',
-                'message' => 'Composition not found',
+            if (!isset($data['revision']) || !is_int($data['revision']) || $data['revision'] < $composed['revision']) {
+                $result['disposition'] = 'error';
+                $result['error'] = [
+                    'type' => 'revision_mismatch',
+                    'message' => 'Revision mismatch',
+                    'currentRevision' => $composed['revision'],
+                ];
+                return null;
+            }
+
+            $composed['revision'] = $data['revision'];
+            $composed['sender'] = $data['sender'] ?? [];
+            $composed['message'] = $data['message'] ?? [];
+            $composed = $this->markRemoteDirty($composed);
+            $result = [
+                'identifier' => $identifier,
+                'disposition' => 'patched',
             ];
-            return $result;
+
+            return $composed;
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $composed = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $identifier,
+            $patchComposition,
+        );
+        if (($result['disposition'] ?? null) === 'patched' && $composed !== null) {
+            $event = new CompositionSavedEvent($tenantId, $userId, $identifier, (int)($composed['revision'] ?? 0));
+            $this->events->dispatch($event);
         }
 
-        if (!isset($data['revision']) || !is_int($data['revision']) || $data['revision'] < $composed['revision']) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'revision_mismatch',
-                'message' => 'Revision mismatch',
-                'currentRevision' => $composed['revision'],
-            ];
-            return $result;
-        }
-
-        // Apply the patch data to the composed message
-        $composed['revision'] = $data['revision'];
-        $composed['sender'] = $data['sender'] ?? [];
-        $composed['message'] = $data['message'] ?? [];
-
-        $this->compositionStore->compositionSave($tenantId, $userId, $identifier, $composed);
-
-        $result = [
-            'identifier' => $identifier,
-            'disposition' => 'patched',
-        ];
         return $result;
     }
 
+    public function save(string $tenantId, string $userId, string $identifier, array $data): array {
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $saveComposition = function (?array $composed) use ($data): ?array {
+            if ($composed === null) {
+                return null;
+            }
+
+            if (isset($data['revision']) && is_int($data['revision'])) {
+                $composed['revision'] = $data['revision'];
+            }
+            $composed['sender'] = $data['sender'];
+            $composed['message'] = $data['message'];
+            return $this->markRemoteDirty($composed);
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $composed = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $identifier,
+            $saveComposition,
+        );
+        if ($composed === null) {
+            return [
+                'identifier' => $identifier,
+                'disposition' => 'error',
+                'error' => [
+                    'type' => 'composition_not_found',
+                    'message' => 'Composition not found',
+                ],
+            ];
+        }
+
+        $synchronized = $this->synchronize($tenantId, $userId, $identifier);
+        if ($synchronized['disposition'] !== 'saved') {
+            return [
+                'identifier' => $identifier,
+                'disposition' => 'error',
+                'error' => [
+                    'type' => 'composition_save_failed',
+                    'message' => (string)($synchronized['error'] ?? 'Draft could not be saved to the server'),
+                ],
+            ];
+        }
+
+        $this->compositionStore->compositionDiscard($tenantId, $userId, $identifier);
+        return ['identifier' => $identifier, 'disposition' => 'saved'];
+    }
+
     public function discard(string $tenantId, string $userId, string $identifier): array {
-        return [
+        $composed = $this->compositionStore->compositionFetch($tenantId, $userId, $identifier);
+        if ($composed === null) {
+            return ['identifier' => $identifier, 'disposition' => 'discarded'];
+        }
+
+        try {
+            $remoteEntity = $this->remoteEntityIdentifier($composed['remote']['entity'] ?? null);
+            if ($remoteEntity !== null) {
+                $outcomes = $this->mailManager->entityDelete($tenantId, $userId, $remoteEntity);
+                $outcome = $outcomes[(string)$remoteEntity] ?? reset($outcomes);
+                if (!is_array($outcome) || ($outcome['disposition'] ?? 'error') === 'error') {
+                    return [
+                        'identifier' => $identifier,
+                        'disposition' => 'error',
+                        'error' => [
+                            'type' => 'composition_discard_failed',
+                            'message' => is_array($outcome)
+                                ? (string)($outcome['error'] ?? 'Remote draft could not be discarded')
+                                : 'Remote draft could not be discarded',
+                        ],
+                    ];
+                }
+            }
+        } catch (Throwable $throwable) {
+            return [
+                'identifier' => $identifier,
+                'disposition' => 'error',
+                'error' => [
+                    'type' => 'composition_discard_failed',
+                    'message' => $throwable->getMessage(),
+                ],
+            ];
+        }
+
+        $this->compositionStore->compositionDiscard($tenantId, $userId, $identifier);
+        return ['identifier' => $identifier, 'disposition' => 'discarded'];
+    }
+
+    public function synchronize(string $tenantId, string $userId, string $identifier): array {
+        $result = [
             'identifier' => $identifier,
-            'disposition' => $this->compositionStore->compositionDiscard($tenantId, $userId, $identifier),
+            'disposition' => 'staged',
         ];
+
+        // Construct the synchronization operation that will run while the composition is locked.
+        $synchronizeComposition = function (?array $composed) use ($tenantId, $userId, $identifier, &$result): ?array {
+            if ($composed === null) {
+                $result['error'] = 'Composition not found';
+                return null;
+            }
+
+            $remote = isset($composed['remote']) && is_array($composed['remote'])
+                ? $composed['remote']
+                : ['status' => 'dirty', 'entity' => null, 'error' => null];
+
+            if (($remote['status'] ?? 'dirty') === 'synced') {
+                $result['disposition'] = 'saved';
+                return null;
+            }
+
+            try {
+                $sender = isset($composed['sender']) && is_array($composed['sender'])
+                    ? $composed['sender']
+                    : [];
+                $senderAddress = (string)($sender['address'] ?? '');
+                if ($senderAddress === '' || !filter_var($senderAddress, FILTER_VALIDATE_EMAIL)) {
+                    throw new RuntimeException('Composition sender is invalid');
+                }
+
+                $service = $this->mailManager->serviceFindByAddress($tenantId, $userId, $senderAddress);
+                if ($service === null || $service->getEnabled() === false) {
+                    throw new RuntimeException("No enabled mail service handles '$senderAddress'");
+                }
+                if (!$service instanceof ServiceEntityMutableInterface) {
+                    throw new RuntimeException("Mail service '{$service->identifier()}' does not support draft mutations");
+                }
+
+                $target = $this->resolveDraftCollection($service);
+                $attachments = isset($composed['attachments']) && is_array($composed['attachments'])
+                    ? array_values($composed['attachments'])
+                    : [];
+                $properties = $this->buildMessageProperties(
+                    service: $service,
+                    sender: Address::fromArray($sender),
+                    message: is_array($composed['message'] ?? null) ? $composed['message'] : [],
+                    attachments: $attachments,
+                    composed: $composed,
+                    tenantId: $tenantId,
+                    userId: $userId,
+                    compositionId: $identifier,
+                );
+                $properties->setFlag('draft', true);
+                $properties->setFlag('seen', true);
+
+                $remoteEntity = $this->remoteEntityIdentifier($remote['entity'] ?? null);
+                if ($remoteEntity === null) {
+                    $entity = $this->mailManager->entityCreate($tenantId, $userId, $target, $properties);
+                } else {
+                    if ($remoteEntity->provider() !== $service->provider()
+                        || (string)$remoteEntity->service() !== (string)$service->identifier()) {
+                        throw new RuntimeException('Changing the draft service is not supported yet');
+                    }
+                    $entity = $this->mailManager->entityModify($tenantId, $userId, $remoteEntity, $properties);
+                }
+
+                if ($entity->collection() === null || $entity->identifier() === null) {
+                    throw new RuntimeException('Provider returned an incomplete draft identifier');
+                }
+
+                $composed['remote'] = [
+                    ...$remote,
+                    'status' => 'synced',
+                    'entity' => (string)new EntityIdentifier(
+                        $entity->provider(),
+                        (string)$entity->service(),
+                        (string)$entity->collection(),
+                        (string)$entity->identifier(),
+                    ),
+                    'error' => null,
+                ];
+                $result['disposition'] = 'saved';
+            } catch (Throwable $throwable) {
+                $composed['remote'] = [
+                    ...$remote,
+                    'status' => 'failed',
+                    'entity' => $remote['entity'] ?? null,
+                    'error' => $throwable->getMessage(),
+                ];
+                $result['error'] = $throwable->getMessage();
+            }
+
+            return $composed;
+        };
+
+        // Synchronize and atomically persist the resulting remote state.
+        $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $identifier,
+            $synchronizeComposition,
+        );
+
+        return $result;
     }
 
     public function send(string $tenantId, string $userId, string $identifier, array $sender, array $message, array $attachments): array {
-        $composed = $this->compositionStore->compositionFetch($tenantId, $userId, $identifier);
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $saveComposition = function (?array $composed) use ($sender, $message): ?array {
+            if ($composed === null) {
+                return null;
+            }
+
+            $composed['sender'] = $sender;
+            $composed['message'] = $message;
+            return $this->markRemoteDirty($composed);
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $composed = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $identifier,
+            $saveComposition,
+        );
 
         if ($composed === null) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'composition_not_found',
-                'message' => 'Composition not found',
+            return [
+                'disposition' => 'error',
+                'error' => [
+                    'type' => 'composition_not_found',
+                    'message' => 'Composition not found',
+                ],
             ];
-            return $result;
         }
 
-        // store the message and sender information before sending
-        $composed['sender'] = $sender;
-        $composed['message'] = $message;
-        $this->compositionStore->compositionSave($tenantId, $userId, $identifier, $composed);
-
         // validate the sender address before attempting to send the message
         if ($sender['address'] === '' || !filter_var($sender['address'], FILTER_VALIDATE_EMAIL)) {
             $result['disposition'] = 'error';
@@ -220,7 +472,7 @@ class CompositionManager {
     }
 
     private function buildMessageProperties(
-        ServiceEntitySubmitInterface $service,
+        ServiceEntitySubmitInterface|ServiceEntityMutableInterface $service,
         AddressInterface $sender,
         array $message,
         array $attachments,
@@ -292,6 +544,306 @@ class CompositionManager {
 
         return $properties;
     }
+    
+    public function attachmentAdd(string $tenantId, string $userId, string $composition, array ...$attachments): array {
+        $result = [
+            'composition' => $composition,
+            'attachments' => [],
+        ];
+        $failed = [];
+        $compositionChanged = false;
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $addAttachments = function (?array $composed) use ($tenantId, $userId, $composition, $attachments, &$result, &$failed, &$compositionChanged): ?array {
+            if ($composed === null) {
+                $result['disposition'] = 'error';
+                $result['error'] = [
+                    'type' => 'composition_not_found',
+                    'message' => 'Composition not found',
+                ];
+                return null;
+            }
+
+            $uploads = [];
+            $documents = [];
+            foreach ($attachments as $attachment) {
+                if (isset($attachment['origin']) && $attachment['origin'] === 'documents') {
+                    $documents[] = $attachment;
+                } elseif (isset($attachment['origin']) && $attachment['origin'] === 'device') {
+                    $uploads[] = $attachment;
+                }
+            }
+            if ($uploads !== []) {
+                $this->attachmentAddFromDevice($tenantId, $userId, $composition, $uploads, $composed);
+            }
+            if ($documents !== []) {
+                $failed = $this->attachmentAddFromDocuments($tenantId, $userId, $composition, $documents, $composed);
+            }
+
+            $deviceAttachmentsChanged = $uploads !== [];
+            $documentAttachmentsChanged = count($failed) < count($documents);
+            if ($deviceAttachmentsChanged || $documentAttachmentsChanged) {
+                $composed = $this->markRemoteDirty($composed);
+                $compositionChanged = true;
+            }
+
+            return $composed;
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $composed = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $composition,
+            $addAttachments,
+        );
+
+        if ($composed === null) {
+            return $result;
+        }
+
+        // construct the result
+        $result['attachments'] = $composed['attachments'];
+        $result['failed'] = $failed;
+        $result['disposition'] = match (true) {
+            $failed === [] => 'added',
+            $result['attachments'] !== [] => 'partial',
+            default => 'error',
+        };
+        if ($result['disposition'] === 'error') {
+            $result['error'] = [
+                'type' => 'attachment_add_failed',
+                'message' => 'None of the requested attachments could be added',
+            ];
+        }
+        if ($compositionChanged) {
+            $event = new CompositionSavedEvent($tenantId, $userId, $composition, (int)($composed['revision'] ?? 0));
+            $this->events->dispatch($event);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Stage device-uploaded (base64 payload) attachment entries
+     */
+    private function attachmentAddFromDevice(string $tenantId, string $userId, string $composition, array $uploads, array &$composed): void {
+        foreach ($uploads as $attachment) {
+            $identifier = (isset($attachment['identifier']) && is_string($attachment['identifier']) && $attachment['identifier'] !== '')
+                ? $attachment['identifier']
+                : UUID::v4();
+
+            $decoded = base64_decode((string) ($attachment['data'] ?? ''), true);
+            if ($decoded === false) {
+                throw new InvalidArgumentException('Attachment payload is not valid base64');
+            }
+
+            $data = new BinaryResource(
+                $attachment['name'] ?? 'unknown.bin',
+                $attachment['type'] ?? 'application/octet-stream',
+                $this->stringToGenerator($decoded),
+            );
+
+            $meta = $this->compositionStore->attachmentStageFromStream(
+                tenantId: $tenantId,
+                userId: $userId,
+                compositionId: $composition,
+                attachmentId: $identifier,
+                data: $data,
+            );
+            $meta['origin'] = 'device';
+            $composed['attachments'][$meta['identifier']] = $meta;
+        }
+    }
+
+    private function resolveDocumentsManager(): ?DocumentsManager {
+        $module = $this->moduleManager->fetch(self::DOCUMENTS_MODULE_HANDLE);
+        if ($module === null || !$module->enabled()) {
+            return null;
+        }
+        if (!$this->container->has(DocumentsManager::class)) {
+            return null;
+        }
+
+        return $this->container->get(DocumentsManager::class);
+    }
+
+    /**
+     * Stage documents-sourced attachment entries
+     */
+    private function attachmentAddFromDocuments(string $tenantId, string $userId, string $composition, array $sourced, array &$composed): array {
+        $failed = [];
+
+        // The documents module is an optional dependency, so we must resolve it
+        // lazily and handle the case where it is not installed or enabled.
+        $documentsManager = $this->resolveDocumentsManager();
+        if ($documentsManager === null) {
+            foreach ($sourced as $attachment) {
+                $failed[] = [
+                    'identifier' => (string) ($attachment['source'] ?? ''),
+                    'message' => 'Documents module is not installed or enabled',
+                ];
+            }
+            return $failed;
+        }
+
+        $requested = [];
+        foreach ($sourced as $attachment) {
+            $rawIdentifier = (string) $attachment['source'];
+            try {
+                $parsed = ResourceIdentifier::fromString($rawIdentifier);
+            } catch (InvalidArgumentException) {
+                $failed[] = ['identifier' => $rawIdentifier, 'message' => 'Invalid document identifier'];
+                continue;
+            }
+            if (!$parsed instanceof EntityIdentifier) {
+                $failed[] = ['identifier' => $rawIdentifier, 'message' => 'Invalid document identifier'];
+                continue;
+            }
+            $requested[] = ['attachment' => $attachment, 'identifier' => $parsed];
+        }
+
+        if ($requested === []) {
+            return $failed;
+        }
+
+        $entities = $documentsManager->entityFetchBulk($tenantId, $userId, ...array_column($requested, 'identifier'));
+        $entitiesByUrn = [];
+        foreach ($entities as $entity) {
+            $entitiesByUrn[$entity->urn()] = $entity;
+        }
+
+        foreach ($requested as ['attachment' => $attachment, 'identifier' => $entityIdentifier]) {
+            $urn = (string) $entityIdentifier;
+            $entity = $entitiesByUrn[$urn] ?? null;
+            if ($entity === null) {
+                $failed[] = ['identifier' => $urn, 'message' => 'Document not found or access denied'];
+                continue;
+            }
+
+            $resource = $documentsManager->entityReadStream($tenantId, $userId, $entityIdentifier);
+            if ($resource === null) {
+                $failed[] = ['identifier' => $urn, 'message' => 'Document content could not be read'];
+                continue;
+            }
+
+            $identifier = (isset($attachment['identifier']) && is_string($attachment['identifier']) && $attachment['identifier'] !== '')
+                ? $attachment['identifier']
+                : UUID::v4();
+
+            $properties = $entity->getProperties();
+            $data = new BinaryResource($properties->getLabel(), $properties->getMime(), $this->streamToGenerator($resource));
+
+            $meta = $this->compositionStore->attachmentStageFromStream(
+                tenantId: $tenantId,
+                userId: $userId,
+                compositionId: $composition,
+                attachmentId: $identifier,
+                data: $data,
+            );
+            $meta['origin'] = 'documents';
+            $meta['source'] = $urn;
+            $composed['attachments'][$meta['identifier']] = $meta;
+        }
+
+        return $failed;
+    }
+
+    public function attachmentRemove(string $tenantId, string $userId, string $composition, string $identifier): array {
+        $result = [
+            'composition' => $composition,
+            'identifier' => $identifier,
+        ];
+
+        // Construct the snapshot mutation that will run while the composition is locked.
+        $removeAttachment = function (?array $composed) use ($identifier, &$result): ?array {
+            if ($composed === null) {
+                $result['disposition'] = 'error';
+                $result['error'] = [
+                    'type' => 'composition_not_found',
+                    'message' => 'Composition not found',
+                ];
+                return null;
+            }
+            if (!isset($composed['attachments'][$identifier])) {
+                $result['disposition'] = 'error';
+                $result['error'] = [
+                    'type' => 'attachment_not_found',
+                    'message' => 'Attachment not found',
+                ];
+                return null;
+            }
+
+            unset($composed['attachments'][$identifier]);
+            $composed = $this->markRemoteDirty($composed);
+            $result['disposition'] = 'removed';
+            return $composed;
+        };
+
+        // Execute the mutation and atomically persist the snapshot it returns.
+        $composed = $this->compositionStore->compositionSave(
+            $tenantId,
+            $userId,
+            $composition,
+            $removeAttachment,
+        );
+        if (($result['disposition'] ?? null) === 'removed' && $composed !== null) {
+            $event = new CompositionSavedEvent($tenantId, $userId, $composition, (int)($composed['revision'] ?? 0));
+            $this->events->dispatch($event);
+        }
+
+        return $result;
+    }
+
+    private function markRemoteDirty(array $composed): array {
+        $remote = isset($composed['remote']) && is_array($composed['remote'])
+            ? $composed['remote']
+            : [];
+
+        $remote['status'] = 'dirty';
+        $remote['entity'] ??= null;
+        $remote['error'] = null;
+        $composed['remote'] = $remote;
+
+        return $composed;
+    }
+
+    private function resolveDraftCollection(ServiceBaseInterface $service): CollectionIdentifier {
+        $configuredTarget = $service->getAuxiliary()['draftTarget'] ?? null;
+        if ($configuredTarget !== null && (string)$configuredTarget !== '') {
+            return new CollectionIdentifier(
+                $service->provider(),
+                (string)$service->identifier(),
+                (string)$configuredTarget,
+            );
+        }
+
+        $filter = $service->collectionListFilter();
+        $filter->condition('role', CollectionRoles::Drafts->value);
+        $collections = $service->collectionList('', $filter);
+        $collection = reset($collections);
+        if (!$collection instanceof CollectionBaseInterface || $collection->identifier() === null) {
+            throw new RuntimeException("Mail service '{$service->identifier()}' has no Drafts collection");
+        }
+
+        return new CollectionIdentifier(
+            $service->provider(),
+            (string)$service->identifier(),
+            (string)$collection->identifier(),
+        );
+    }
+
+    private function remoteEntityIdentifier(mixed $value): ?EntityIdentifier {
+        if (!is_string($value) || $value === '') {
+            return null;
+        }
+
+        $identifier = ResourceIdentifier::fromString($value);
+        if (!$identifier instanceof EntityIdentifier) {
+            throw new RuntimeException("Invalid remote draft identifier '$value'");
+        }
+
+        return $identifier;
+    }
 
     /**
      * @param array<int,array|string> $entries
@@ -319,78 +871,21 @@ class CompositionManager {
 
         return $addresses;
     }
-    
-    public function attachmentAdd(string $tenantId, string $userId, string $composition, array ...$attachments): array {
-        $result = [
-            'composition' => $composition,
-            'attachments' => [],
-        ];
-        
-        $composed = $this->compositionStore->compositionFetch($tenantId, $userId, $composition);
-        if ($composed === null) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'composition_not_found',
-                'message' => 'Composition not found',
-            ];
-            return $result;
-        }
 
-        foreach ($attachments as $attachment) {
-            if (!isset($attachment['identifier']) || !is_string($attachment['identifier']) || $attachment['identifier'] === '') {
-                $identifier = UUID::v4();
-            } else {
-                $identifier = $attachment['identifier'];
-            }
-
-            $meta = $this->compositionStore->attachmentStageFromBase64(
-                tenantId: $tenantId,
-                userId: $userId,
-                compositionId: $composition,
-                attachmentId: $identifier,
-                name: $attachment['name'] ?? 'unknown.bin',
-                type: $attachment['type'] ?? 'application/octet-stream',
-                data: $attachment['data'] ?? '',
-            );
-            $meta['origin'] = 'upload';
-            $composed['attachments'][$meta['identifier']] = $meta;
-        }
-
-        $this->compositionStore->compositionSave($tenantId, $userId, $composition, $composed);
-        
-        $result['disposition'] = 'added';
-        $result['attachments'] = $composed['attachments'];
-        return $result;
+    /**
+     * Wrap an in-memory byte string in a single-chunk Generator.
+     */
+    private function stringToGenerator(string $bytes): \Generator {
+        yield $bytes;
     }
 
-    public function attachmentRemove(string $tenantId, string $userId, string $composition, string $identifier): array {
-        $result = [
-            'composition' => $composition,
-            'identifier' => $identifier,
-        ];
-        
-        $composed = $this->compositionStore->compositionFetch($tenantId, $userId, $composition);
-        if ($composed === null) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'composition_not_found',
-                'message' => 'Composition not found',
-            ];
-            return $result;
+    /**
+     * Wrap a raw PHP stream resource in a Generator yielding chunks, closing it once exhausted.
+     */
+    private function streamToGenerator($resource): \Generator {
+        while (!feof($resource)) {
+            yield fread($resource, 65536);
         }
-        if (!isset($composed['attachments'][$identifier])) {
-            $result['disposition'] = 'error';
-            $result['error'] = [
-                'type' => 'attachment_not_found',
-                'message' => 'Attachment not found',
-            ];
-            return $result;
-        }
-
-        unset($composed['attachments'][$identifier]);
-        $this->compositionStore->compositionSave($tenantId, $userId, $composition, $composed);
-
-        $result['disposition'] = 'removed';
-        return $result;
+        fclose($resource);
     }
-}
+}

lib/CompositionSavedEvent.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXM\Mail;
+
+use InvalidArgumentException;
+use KTXF\Event\Event;
+
+final class CompositionSavedEvent extends Event {
+
+    public function __construct(
+        string $tenantId,
+        private readonly string $userId,
+        private readonly string $compositionId,
+        private readonly int $revision,
+    ) {
+        if ($tenantId === '' || $this->userId === '' || $this->compositionId === '') {
+            throw new InvalidArgumentException('Composition save events require tenant, user, and composition identifiers');
+        }
+        if ($this->revision < 0) {
+            throw new InvalidArgumentException('Composition save event revision cannot be negative');
+        }
+
+        parent::__construct(
+            self::class,
+            [
+                'userId' => $this->userId,
+                'compositionId' => $this->compositionId,
+                'revision' => $this->revision,
+            ],
+            $tenantId,
+            $this->userId,
+        );
+    }
+
+    public function userIdentifier(): string {
+        return $this->userId;
+    }
+
+    public function compositionIdentifier(): string {
+        return $this->compositionId;
+    }
+
+    public function revision(): int {
+        return $this->revision;
+    }
+}

lib/CompositionSyncListener.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXM\Mail;
+
+final class CompositionSyncListener {
+
+    public function __construct(
+        private readonly CompositionManager $compositionManager,
+    ) {}
+
+    public function onCompositionSaved(CompositionSavedEvent $event): void {
+        $this->compositionManager->synchronize(
+            $event->tenantIdentifier(),
+            $event->userIdentifier(),
+            $event->compositionIdentifier(),
+        );
+    }
+}

lib/Controllers/CompositionController.php

@@ -7,8 +7,8 @@ namespace KTXM\Mail\Controllers;
 use InvalidArgumentException;
 use KTXC\Http\Response\JsonResponse;
 use KTXC\Http\Response\Response;
-use KTXC\SessionIdentity;
-use KTXC\SessionTenant;
+use KTXC\Context\IdentityContextInterface;
+use KTXC\Context\TenantContextInterface;
 use KTXF\Controller\ControllerAbstract;
 use KTXF\Routing\Attributes\AuthenticatedRoute;
 use KTXM\Mail\CompositionManager;
@@ -18,8 +18,8 @@ use Throwable;
 final class CompositionController extends ControllerAbstract {
 
     public function __construct(
-        private readonly SessionTenant $tenantIdentity,
-        private readonly SessionIdentity $userIdentity,
+        private readonly TenantContextInterface $tenantContext,
+        private readonly IdentityContextInterface $identityContext,
         private readonly CompositionManager $compositionManager,
         private readonly LoggerInterface $logger,
     ) {}
@@ -31,8 +31,8 @@ final class CompositionController extends ControllerAbstract {
         string|null $operation = null,
         array|null $data = null,
     ): Response {
-        $tenantId = $this->tenantIdentity->identifier();
-        $userId = $this->userIdentity->identifier();
+        $tenantId = $this->tenantContext->identifier();
+        $userId = $this->identityContext->identifier();
 
         try {
             if ($operation === null) {
@@ -42,6 +42,7 @@ final class CompositionController extends ControllerAbstract {
             $result = match ($operation) {
                 'stage' => $this->stage($tenantId, $userId, $data),
                 'patch' => $this->patch($tenantId, $userId, $data),
+                'save' => $this->save($tenantId, $userId, $data),
                 'discard' => $this->discard($tenantId, $userId, $data),
                 'send' => $this->send($tenantId, $userId, $data),
                 'attachment.add' => $this->attachmentAdd($tenantId, $userId, $data),
@@ -108,6 +109,21 @@ final class CompositionController extends ControllerAbstract {
 
         return $this->compositionManager->patch($tenantId, $userId, $data['identifier'], $data);
     }
+
+    private function save(string $tenantId, string $userId, array $data): array {
+        if (!isset($data['identifier']) || !is_string($data['identifier']) || $data['identifier'] === '') {
+            throw new InvalidArgumentException('Invalid parameter: identifier must be a non-empty string');
+        }
+        if (!isset($data['sender']) || !is_array($data['sender'])) {
+            throw new InvalidArgumentException('Invalid parameter: sender must be an array');
+        }
+        if (!isset($data['message']) || !is_array($data['message'])) {
+            throw new InvalidArgumentException('Invalid parameter: message must be an array');
+        }
+
+        return $this->compositionManager->save($tenantId, $userId, $data['identifier'], $data);
+    }
+
     private function discard(string $tenantId, string $userId, array $data): array {
         if (!isset($data['identifier']) || !is_string($data['identifier']) || $data['identifier'] === '') {
             throw new InvalidArgumentException('Invalid parameter: identifier must be a non-empty string');

lib/Module.php

@@ -2,6 +2,8 @@
 
 namespace KTXM\Mail;
 
+use KTXF\Event\DeliveryMode;
+use KTXF\Event\EventListenerRegistrarInterface;
 use KTXF\Module\ModuleBrowserInterface;
 use KTXF\Module\ModuleInstanceAbstract;
 
@@ -11,8 +13,20 @@ use KTXF\Module\ModuleInstanceAbstract;
 class Module extends ModuleInstanceAbstract implements ModuleBrowserInterface
 {
 
-    public function __construct()
-    { }
+    public function __construct(
+        private readonly EventListenerRegistrarInterface $events,
+    ) {}
+
+    public function boot(): void
+    {
+        $this->events->listen(
+            $this->handle(),
+            CompositionSavedEvent::class,
+            CompositionSyncListener::class,
+            'onCompositionSaved',
+            DeliveryMode::Deferred,
+        );
+    }
 
     public function handle(): string
     {

lib/Stores/CompositionStore.php

@@ -6,6 +6,8 @@ namespace KTXM\Mail\Stores;
 
 use DI\Attribute\Inject;
 use KTXF\Resource\BinaryResource;
+use RuntimeException;
+use UnexpectedValueException;
 
 final class CompositionStore {
 
@@ -20,47 +22,121 @@ final class CompositionStore {
     }
 
     public function compositionFetch(string $tenantId, string $userId, string $draftId): ?array {
-        $draftDir = $this->draftDir($tenantId, $userId, $draftId);
-        if (!is_dir($draftDir)) {
-            return null;
-        }
-
-        $messagePath = $draftDir . '/' . self::COMPOSITION_FILENAME;
-        if (!file_exists($messagePath)) {
-            return null;
-        }
-
-        $decoded = json_decode((string)file_get_contents($messagePath), true);
-        return is_array($decoded) ? $decoded : null;
+        return $this->withCompositionLock(
+            $tenantId,
+            $userId,
+            $draftId,
+            LOCK_SH,
+            fn(): ?array => $this->compositionRead($tenantId, $userId, $draftId),
+        );
     }
 
-    public function compositionSave(string $tenantId, string $userId, string $draftId, array $snapshot): array {
-        $draftDir = $this->draftDir($tenantId, $userId, $draftId);
-        if (!is_dir($draftDir)) {
-            mkdir($draftDir, 0755, true);
-        }
+    /**
+     * Atomically read, mutate, and replace a composition snapshot.
+     *
+     * Returning null from the callback leaves the stored snapshot unchanged.
+     * The callback receives null when the composition does not exist.
+     *
+     * @param callable(?array): ?array $update
+     */
+    public function compositionSave(string $tenantId, string $userId, string $draftId, callable $update): ?array {
+        return $this->withCompositionLock(
+            $tenantId,
+            $userId,
+            $draftId,
+            LOCK_EX,
+            function () use ($tenantId, $userId, $draftId, $update): ?array {
+                $snapshot = $update($this->compositionRead($tenantId, $userId, $draftId));
+                if ($snapshot === null) {
+                    return null;
+                }
+                if (!is_array($snapshot)) {
+                    throw new UnexpectedValueException('Composition save callback must return an array or null');
+                }
 
-        file_put_contents($draftDir . '/' . self::COMPOSITION_FILENAME, json_encode($snapshot, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
-        return $snapshot;
+                $json = json_encode($snapshot, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR);
+                $draftDir = $this->draftDir($tenantId, $userId, $draftId);
+                $this->ensureDirectory($draftDir);
+
+                $temporaryPath = tempnam($draftDir, '.composition-');
+                if ($temporaryPath === false) {
+                    throw new RuntimeException("Unable to create a temporary composition file for '$draftId'");
+                }
+
+                try {
+                    $written = file_put_contents($temporaryPath, $json);
+                    if ($written !== strlen($json)) {
+                        throw new RuntimeException("Unable to write composition '$draftId'");
+                    }
+                    if (!rename($temporaryPath, $draftDir . '/' . self::COMPOSITION_FILENAME)) {
+                        throw new RuntimeException("Unable to replace composition '$draftId'");
+                    }
+                } finally {
+                    if (is_file($temporaryPath)) {
+                        unlink($temporaryPath);
+                    }
+                }
+
+                return $snapshot;
+            },
+        );
     }
 
     public function compositionDiscard(string $tenantId, string $userId, string $draftId): bool {
-        $draftDir = $this->draftDir($tenantId, $userId, $draftId);
-        if (!is_dir($draftDir)) {
-            return false;
-        }
+        return $this->withCompositionLock(
+            $tenantId,
+            $userId,
+            $draftId,
+            LOCK_EX,
+            function () use ($tenantId, $userId, $draftId): bool {
+                $draftDir = $this->draftDir($tenantId, $userId, $draftId);
+                if (!is_dir($draftDir)) {
+                    return false;
+                }
 
-        $this->deleteDir($draftDir);
-        return true;
+                $this->deleteDir($draftDir);
+                return true;
+            },
+        );
     }
 
-    public function attachmentStageFromStream(
-        string $tenantId,
-        string $userId,
-        string $compositionId,
-        string $attachmentId,
-        BinaryResource $data,
-    ): array {
+    private function compositionRead(string $tenantId, string $userId, string $draftId): ?array {
+        $messagePath = $this->draftDir($tenantId, $userId, $draftId) . '/' . self::COMPOSITION_FILENAME;
+        if (!is_file($messagePath)) {
+            return null;
+        }
+
+        $contents = file_get_contents($messagePath);
+        if ($contents === false) {
+            throw new RuntimeException("Unable to read composition '$draftId'");
+        }
+
+        $decoded = json_decode($contents, true);
+        return is_array($decoded) ? $decoded : null;
+    }
+
+    private function withCompositionLock(string $tenantId, string $userId, string $draftId, int $operation, callable $callback): mixed {
+        $lockDir = $this->storagePath . '/.locks';
+        $this->ensureDirectory($lockDir);
+        $lockId = hash('sha256', $tenantId . "\0" . $userId . "\0" . $draftId);
+        $handle = fopen($lockDir . '/' . $lockId . '.lock', 'c+b');
+        if ($handle === false) {
+            throw new RuntimeException("Unable to open composition lock for '$draftId'");
+        }
+
+        try {
+            if (!flock($handle, $operation)) {
+                throw new RuntimeException("Unable to lock composition '$draftId'");
+            }
+
+            return $callback();
+        } finally {
+            flock($handle, LOCK_UN);
+            fclose($handle);
+        }
+    }
+
+    public function attachmentStageFromStream(string $tenantId, string $userId, string $compositionId, string $attachmentId, BinaryResource $data): array {
         $attachmentDir = $this->attachmentDir($tenantId, $userId, $compositionId);
         if (!is_dir($attachmentDir)) {
             mkdir($attachmentDir, 0755, true);
@@ -91,40 +167,6 @@ final class CompositionStore {
         return $meta;
     }
 
-    public function attachmentStageFromBase64(
-        string $tenantId,
-        string $userId,
-        string $compositionId,
-        string $attachmentId,
-        string $name,
-        string $type,
-        string $data,
-    ): array {
-        $decoded = base64_decode($data, true);
-        if ($decoded === false) {
-            throw new \InvalidArgumentException('Attachment payload is not valid base64');
-        }
-
-        $attachmentDir = $this->attachmentDir($tenantId, $userId, $compositionId);
-        if (!is_dir($attachmentDir)) {
-            mkdir($attachmentDir, 0755, true);
-        }
-
-        file_put_contents($attachmentDir . '/' . $attachmentId . '.blob', $decoded);
-
-        $metadata = [
-            'identifier' => $attachmentId,
-            'composition' => $compositionId,
-            'name' => $name,
-            'type' => $type,
-            'size' => strlen($decoded),
-        ];
-
-        file_put_contents($attachmentDir . '/' . $attachmentId . '.meta', json_encode($metadata, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
-
-        return $metadata;
-    }
-
     public function attachmentFetchData(string $tenantId, string $userId, string $compositionId, string $attachmentId): ?string {
         $path = $this->attachmentDir($tenantId, $userId, $compositionId) . '/' . $attachmentId . '.blob';
         if (!file_exists($path)) {
@@ -152,6 +194,12 @@ final class CompositionStore {
         return $this->storagePath . '/' . $tenantId . '/' . $userId . '/' . $draftId;
     }
 
+    private function ensureDirectory(string $path): void {
+        if (!is_dir($path) && !mkdir($path, 0755, true) && !is_dir($path)) {
+            throw new RuntimeException("Unable to create directory '$path'");
+        }
+    }
+
     private function deleteDir(string $path): void {
         if (!is_dir($path)) {
             return;
@@ -173,4 +221,4 @@ final class CompositionStore {
 
         rmdir($path);
     }
-}
+}

package-lock.json

@@ -795,49 +795,49 @@
       "license": "MIT"
     },
     "node_modules/@tiptap/core": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.29.0.tgz",
-      "integrity": "sha512-A/lrhKpOYtl0V5pmPS00Zps8pgBe1qDOoD9fzsumDSZ3HP8W398C959Jgru75PNFokAya9COPD3iaKP3NWF25g==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.30.2.tgz",
+      "integrity": "sha512-QbZC/s1OOqcoUdkhIY16TjR/gCtR0qAk9e4bJwUqOJqZuv5ozqCL5hzWm22jjTPp6c6Ei2tPd6t30VwfIKW4lQ==",
       "license": "MIT",
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/ueberdosis"
       },
       "peerDependencies": {
-        "@tiptap/pm": "3.29.0"
+        "@tiptap/pm": "3.30.2"
       }
     },
     "node_modules/@tiptap/extension-blockquote": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-blockquote/-/extension-blockquote-3.29.0.tgz",
-      "integrity": "sha512-k8NKHLEYOqre7guObZBeFM04CaTwmEceCmdIrIjd7H9KoHSbRODaBNved6j5G33x/FWMwIF/RQbE2BjWaFSgzA==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-blockquote/-/extension-blockquote-3.30.2.tgz",
+      "integrity": "sha512-BOkwhZenek7vzXBOgKppSrlx4YryBdAYu1p1MXKn0R9A9eNmE2HVhmm0gG49+E8BhsE/TG8wKVclwET42JJiIg==",
       "license": "MIT",
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/ueberdosis"
       },
       "peerDependencies": {
-        "@tiptap/core": "3.29.0",
-        "@tiptap/pm": "3.29.0"
+        "@tiptap/core": "3.30.2",
+        "@tiptap/pm": "3.30.2"
       }
     },
     "node_modules/@tiptap/extension-bold": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-bold/-/extension-bold-3.29.0.tgz",
-      "integrity": "sha512-BPUJvJ9sCsU3fxao5UJfDJrDuHhMn2hczZwZ9Qs4w1vkAeLGyOYbSejUTJdBYHLoexGiEwgnEeVeZN3C8GaI5g==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bold/-/extension-bold-3.30.2.tgz",
+      "integrity": "sha512-MsvJhPgYejY2D9MhwYJv8AmscozvLBI8qtJ7YLdYZBWkMR4bgmxHq5+xqEfBsao9bOMMwBon9p3+P+/Tq5ReWA==",
       "license": "MIT",
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/ueberdosis"
       },
       "peerDependencies": {
-        "@tiptap/core": "3.29.0"
+        "@tiptap/core": "3.30.2"
       }
     },
     "node_modules/@tiptap/extension-bubble-menu": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-bubble-menu/-/extension-bubble-menu-3.29.0.tgz",
-      "integrity": "sha512-aBNI8ebX76ObderRmu/PJ9Q2AGVEuhpg0TBvv2SNbHtmU5kNUMHQI8HxrxKFblJwETAmG6EJ3Ed/5jRxpJmrsg==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bubble-menu/-/extension-bubble-menu-3.30.2.tgz",
+      "integrity": "sha512-oS0WiWNXHKpiPYMkcnHm1j7iEvufTGGtLFtcJJd3olb5OS6V2acoXVDL0nNJDmRQ32K3QXut3fbRcMseMxT+lw==",
       "license": "MIT",
       "optional": true,
       "dependencies": {
@@ -848,67 +848,80 @@
         "url": "https://github.com/sponsors/ueberdosis"
       },
       "peerDependencies": {
-        "@tiptap/core": "3.29.0",
-        "@tiptap/pm": "3.29.0"
+        "@tiptap/core": "3.30.2",
+        "@tiptap/pm": "3.30.2"
+      }
+    },
+    "node_modules/@tiptap/extension-bullet-list": {
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/extension-bullet-list/-/extension-bullet-list-3.30.2.tgz",
+      "integrity": "sha512-+awIL/TUz4aB3rL68igU1rWfaaoBIAkPcakkktkRq8gYf0bd9eSb48P6kHkpx/3q+JyK7g9vsnltLNHNh6twnA==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
+        "@tiptap/extension-list": "3.30.2"
       }
     },
     "node_modules/@tiptap/extension-code": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-code/-/extension-code-3.29.0.tgz",
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+      "resolved": "https://registry.npmjs.org/@tiptap/pm/-/pm-3.30.2.tgz",
+      "integrity": "sha512-BJN8tUx4ppFN3R3cV/FJfrJbJkvo1lj4uciq+nwpjwzdRvFzqIuglWf+HLcJ6CwlYpLOHp7ArgkBg4Q5e60Gog==",
       "license": "MIT",
       "dependencies": {
         "prosemirror-changeset": "^2.4.1",
@@ -1122,124 +1188,58 @@
       }
     },
     "node_modules/@tiptap/starter-kit": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/starter-kit/-/starter-kit-3.29.0.tgz",
-      "integrity": "sha512-J3jTp3/WXnnL58TCtdMsfeQ2BeycFYrAib6Nbpjd9G0OLUBE7AILiH2HrobRQpvRbAUgD5SW+sBZYOonbWWqNg==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/starter-kit/-/starter-kit-3.30.2.tgz",
+      "integrity": "sha512-fJSrhW1CyD4sjYA20evSP4Cp13B/HhbxCdM974K0xpHOVqvCtNU9w2s9hfq9mg2yGoU7MSNHKNYMkJjIi2/Xyw==",
       "license": "MIT",
       "dependencies": {
-        "@tiptap/core": "^3.29.0",
-        "@tiptap/extension-blockquote": "^3.29.0",
-        "@tiptap/extension-bold": "^3.29.0",
-        "@tiptap/extension-bullet-list": "^3.29.0",
-        "@tiptap/extension-code": "^3.29.0",
-        "@tiptap/extension-code-block": "^3.29.0",
-        "@tiptap/extension-document": "^3.29.0",
-        "@tiptap/extension-dropcursor": "^3.29.0",
-        "@tiptap/extension-gapcursor": "^3.29.0",
-        "@tiptap/extension-hard-break": "^3.29.0",
-        "@tiptap/extension-heading": "^3.29.0",
-        "@tiptap/extension-horizontal-rule": "^3.29.0",
-        "@tiptap/extension-italic": "^3.29.0",
-        "@tiptap/extension-link": "^3.29.0",
-        "@tiptap/extension-list": "^3.29.0",
-        "@tiptap/extension-list-item": "^3.29.0",
-        "@tiptap/extension-list-keymap": "^3.29.0",
-        "@tiptap/extension-ordered-list": "^3.29.0",
-        "@tiptap/extension-paragraph": "^3.29.0",
-        "@tiptap/extension-strike": "^3.29.0",
-        "@tiptap/extension-text": "^3.29.0",
-        "@tiptap/extension-underline": "^3.29.0",
-        "@tiptap/extensions": "^3.29.0",
-        "@tiptap/pm": "^3.29.0"
+        "@tiptap/core": "3.30.2",
+        "@tiptap/extension-blockquote": "3.30.2",
+        "@tiptap/extension-bold": "3.30.2",
+        "@tiptap/extension-bullet-list": "3.30.2",
+        "@tiptap/extension-code": "3.30.2",
+        "@tiptap/extension-code-block": "3.30.2",
+        "@tiptap/extension-document": "3.30.2",
+        "@tiptap/extension-dropcursor": "3.30.2",
+        "@tiptap/extension-gapcursor": "3.30.2",
+        "@tiptap/extension-hard-break": "3.30.2",
+        "@tiptap/extension-heading": "3.30.2",
+        "@tiptap/extension-horizontal-rule": "3.30.2",
+        "@tiptap/extension-italic": "3.30.2",
+        "@tiptap/extension-link": "3.30.2",
+        "@tiptap/extension-list": "3.30.2",
+        "@tiptap/extension-list-item": "3.30.2",
+        "@tiptap/extension-list-keymap": "3.30.2",
+        "@tiptap/extension-ordered-list": "3.30.2",
+        "@tiptap/extension-paragraph": "3.30.2",
+        "@tiptap/extension-strike": "3.30.2",
+        "@tiptap/extension-text": "3.30.2",
+        "@tiptap/extension-underline": "3.30.2",
+        "@tiptap/extensions": "3.30.2",
+        "@tiptap/pm": "3.30.2"
       },
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/ueberdosis"
       }
     },
-    "node_modules/@tiptap/starter-kit/node_modules/@tiptap/extension-bullet-list": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-bullet-list/-/extension-bullet-list-3.29.0.tgz",
-      "integrity": "sha512-1045sC5CRn7KD0wluxZeksBwpm2k3LKBUOM3kNwExHAPSV4in4gdarYJ2/WCmIKsmyj2FzUcF4rbpLLSB/dBSg==",
-      "license": "MIT",
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/ueberdosis"
-      },
-      "peerDependencies": {
-        "@tiptap/extension-list": "3.29.0"
-      }
-    },
-    "node_modules/@tiptap/starter-kit/node_modules/@tiptap/extension-list": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-list/-/extension-list-3.29.0.tgz",
-      "integrity": "sha512-k0B/+nIkn4VvHSQ0kP+AzzAmgeOVxKMAdqG4a6qwxp/lR12aJGHlOP92KCjXV2RNPtuwDksJ1RIXrgxdf9WmJg==",
-      "license": "MIT",
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/ueberdosis"
-      },
-      "peerDependencies": {
-        "@tiptap/core": "3.29.0",
-        "@tiptap/pm": "3.29.0"
-      }
-    },
-    "node_modules/@tiptap/starter-kit/node_modules/@tiptap/extension-list-item": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-list-item/-/extension-list-item-3.29.0.tgz",
-      "integrity": "sha512-JSz27OIDHWDL7uw28E4W3eaN3H1u+NzJQKZkNXo5Qsvvsx8m/YIQWO9XlhiL3V4TZMjfvlc94lUp5tKW5KwETw==",
-      "license": "MIT",
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/ueberdosis"
-      },
-      "peerDependencies": {
-        "@tiptap/extension-list": "3.29.0"
-      }
-    },
-    "node_modules/@tiptap/starter-kit/node_modules/@tiptap/extension-list-keymap": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-list-keymap/-/extension-list-keymap-3.29.0.tgz",
-      "integrity": "sha512-g14QLZR9fmfJIL+X2R/cVTvQS0Mp7CoenA9PO+8adTjK7hCeB8hA3UAakMB4ekkElOXNOtb16e0wqulDcoqANg==",
-      "license": "MIT",
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/ueberdosis"
-      },
-      "peerDependencies": {
-        "@tiptap/extension-list": "3.29.0"
-      }
-    },
-    "node_modules/@tiptap/starter-kit/node_modules/@tiptap/extension-ordered-list": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/extension-ordered-list/-/extension-ordered-list-3.29.0.tgz",
-      "integrity": "sha512-9TXUDFagkGeu6Bo8L0b2SAVAYrY2Xzd28MXwiDxYvDKMjEGWkkCUpMiEI5Qav3GnfFWLmS3jI8PgUjxIw9wLLQ==",
-      "license": "MIT",
-      "funding": {
-        "type": "github",
-        "url": "https://github.com/sponsors/ueberdosis"
-      },
-      "peerDependencies": {
-        "@tiptap/extension-list": "3.29.0"
-      }
-    },
     "node_modules/@tiptap/vue-3": {
-      "version": "3.29.0",
-      "resolved": "https://registry.npmjs.org/@tiptap/vue-3/-/vue-3-3.29.0.tgz",
-      "integrity": "sha512-OFESbEFlmDYPns5LrkyeKggis6tYICBvz+jrlVwxICCWJqWZJJvYb7y/uMtMCxFF1nAeGb8AFr8UhFrLaX5aiA==",
+      "version": "3.30.2",
+      "resolved": "https://registry.npmjs.org/@tiptap/vue-3/-/vue-3-3.30.2.tgz",
+      "integrity": "sha512-7TCahsK19ChY60FvgseTuzaz67yR1tkzTbKW6s3iXx9NTiU411C6WEQAS/EtPt4dsGDv/esFjSc9EMKilRhY5g==",
       "license": "MIT",
       "funding": {
         "type": "github",
         "url": "https://github.com/sponsors/ueberdosis"
       },
       "optionalDependencies": {
-        "@tiptap/extension-bubble-menu": "^3.29.0",
-        "@tiptap/extension-floating-menu": "^3.29.0"
+        "@tiptap/extension-bubble-menu": "^3.30.2",
+        "@tiptap/extension-floating-menu": "^3.30.2"
       },
       "peerDependencies": {
         "@floating-ui/dom": "^1.0.0",
-        "@tiptap/core": "3.29.0",
-        "@tiptap/pm": "3.29.0",
+        "@tiptap/core": "3.30.2",
+        "@tiptap/pm": "3.30.2",
         "vue": "^3.0.0"
       }
     },

src/components/MessageComposer.vue

@@ -12,6 +12,7 @@ import type { CollectionObject, MessageAddressObject } from '@MailManager/models
 import { useMailOperationsStore } from '@/stores/mailOperationsStore'
 import { useMailCompositionStore } from '@/stores/mailCompositionStore'
 import { ComposerMode } from '@/types/composer'
+import { documentsSelectorComponent } from '@/services/documentsSelector'
 import ComposerToolbar from '@/components/composer/ComposerToolbar.vue'
 import ComposerSender from '@/components/composer/ComposerSender.vue'
 import ComposerRecipients from '@/components/composer/ComposerRecipients.vue'
@@ -48,6 +49,10 @@ const {
 const showCc = ref(false)
 const showBcc = ref(false)
 const applyingDraftToEditor = ref(false)
+const showDocumentSelector = ref(false)
+const showCloseDialog = ref(false)
+const closeAction = ref<'save' | 'discard' | null>(null)
+const documentSelector = computed(() => documentsSelectorComponent())
 
 const sender = computed({
   get: () => activeDraft.value?.sender ?? null,
@@ -157,17 +162,55 @@ onBeforeUnmount(() => {
 })
 
 // Handlers
-const handleClose = async () => {
-  await compositionStore.closeDraft()
-  emit('close')
+const handleClose = () => {
+  showCloseDialog.value = true
+}
+
+const handleSave = async () => {
+  closeAction.value = 'save'
+  try {
+    if (await compositionStore.saveDraft()) {
+      showCloseDialog.value = false
+      emit('close')
+    }
+  } finally {
+    closeAction.value = null
+  }
+}
+
+const handleDiscard = async () => {
+  closeAction.value = 'discard'
+  try {
+    if (await compositionStore.discardDraft()) {
+      showCloseDialog.value = false
+      emit('close')
+    }
+  } finally {
+    closeAction.value = null
+  }
 }
 
 const handleSend = async () => {
   await compositionStore.sendDraft()
 }
 
-const handleAttach = async (files: File[]) => {
-  await compositionStore.addAttachments(files)
+const handleAttachFromDevice = async (files: File[]) => {
+  await compositionStore.addAttachmentsFromDevice(files)
+}
+
+const handleAttachFromDocuments = () => {
+  showDocumentSelector.value = true
+}
+
+const handleDocumentsSelected = async (items: { kind: 'entity' | 'collection'; identifier: string; name: string; mimeType?: string; size?: number }[]) => {
+  // The dialog defaults to entities-only (no `selectable` prop passed below), but
+  // filter defensively since mail can't attach a folder as a single file blob.
+  const files = items.filter(item => item.kind === 'entity')
+  if (files.length === 0) {
+    return
+  }
+  await compositionStore.addAttachmentsFromDocuments(files)
+  showDocumentSelector.value = false
 }
 
 const handleDetach = async (identifier: string) => {
@@ -215,7 +258,9 @@ const isActive = (name: string, attrs?: any) => {
       :status="stageStatus"
       :can-send="canSend"
       :sending="sending"
+      :saving="saving"
       @close="handleClose"
+      @save="handleSave"
       @send="handleSend"
     />
 
@@ -264,9 +309,50 @@ const isActive = (name: string, attrs?: any) => {
         @bullet-list="toggleBulletList"
         @ordered-list="toggleOrderedList"
         @link="toggleLink"
-        @attach="handleAttach"
+        @attach-from-device="handleAttachFromDevice"
+        @attach-from-documents="handleAttachFromDocuments"
       />
     </div>
+
+    <component
+      :is="documentSelector"
+      v-if="documentSelector"
+      v-model="showDocumentSelector"
+      :selectable="['entity']"
+      @select="handleDocumentsSelected"
+    />
+
+    <v-dialog v-model="showCloseDialog" max-width="480" persistent>
+      <v-card>
+        <v-card-title>Save this draft?</v-card-title>
+        <v-card-text>
+          Save the draft to your mail server, or discard it permanently.
+        </v-card-text>
+        <v-card-actions>
+          <v-spacer />
+          <v-btn :disabled="closeAction !== null" @click="showCloseDialog = false">
+            Cancel
+          </v-btn>
+          <v-btn
+            color="error"
+            variant="text"
+            :loading="closeAction === 'discard'"
+            :disabled="closeAction !== null || saving"
+            @click="handleDiscard"
+          >
+            Discard
+          </v-btn>
+          <v-btn
+            color="primary"
+            :loading="closeAction === 'save'"
+            :disabled="closeAction !== null || saving"
+            @click="handleSave"
+          >
+            Save and close
+          </v-btn>
+        </v-card-actions>
+      </v-card>
+    </v-dialog>
   </div>
 </template>
 

src/components/composer/ComposerEditor.vue

@@ -2,6 +2,7 @@
 import { ref } from 'vue'
 import type { PropType } from 'vue'
 import { EditorContent, type Editor } from '@tiptap/vue-3'
+import { documentsSelectorAvailable } from '@/services/documentsSelector'
 
 defineProps({
   editor: {
@@ -41,7 +42,8 @@ const emit = defineEmits<{
   bulletList: []
   orderedList: []
   link: []
-  attach: [files: File[]]
+  attachFromDevice: [files: File[]]
+  attachFromDocuments: []
 }>()
 
 const fileInput = ref<HTMLInputElement | null>(null)
@@ -54,7 +56,7 @@ function handleFileChange(event: Event) {
   const input = event.target as HTMLInputElement | null
   const files = input?.files ? Array.from(input.files) : []
   if (files.length > 0) {
-    emit('attach', files)
+    emit('attachFromDevice', files)
   }
   if (input) {
     input.value = ''
@@ -142,6 +144,11 @@ function handleFileChange(event: Event) {
       <v-icon>mdi-paperclip</v-icon>
       <v-tooltip activator="parent" location="bottom">Attach Files</v-tooltip>
     </v-btn>
+
+    <v-btn v-if="documentsSelectorAvailable()" icon size="small" @click="$emit('attachFromDocuments')">
+      <v-icon>mdi-folder-search-outline</v-icon>
+      <v-tooltip activator="parent" location="bottom">Attach from Documents</v-tooltip>
+    </v-btn>
   </v-toolbar>
 
   <v-divider />

src/components/composer/ComposerSender.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
 import type { ComposerSenderIdentity } from '@/types/composer';
-import { computed } from 'vue'
+import { computed, watch } from 'vue'
 
 interface Props {
   modelValue: ComposerSenderIdentity | null
@@ -27,11 +27,6 @@ const items = computed<SenderListItem[]>(() => {
 
 const selectedValue = computed(() => props.modelValue?.address ?? null)
 
-const singleOptionLabel = computed(() => {
-  const onlyOption = props.options[0]
-  return onlyOption ? formatSenderLabel(onlyOption.label, onlyOption.address) : ''
-})
-
 const errorMessages = computed(() => {
   if (props.options.length === 0) {
     return ['No send-capable account is available.']
@@ -40,6 +35,18 @@ const errorMessages = computed(() => {
   return []
 })
 
+// Auto-select (and keep selected) the only send-capable account, since
+// there's no "from" UI shown for the user to pick it themselves.
+watch(
+  () => props.options,
+  options => {
+    if (options.length === 1 && props.modelValue?.address !== options[0].address) {
+      emit('update:modelValue', options[0])
+    }
+  },
+  { immediate: true },
+)
+
 function handleUpdate(value: string | null) {
   const match = value ? props.options.find(o => o.address === value) ?? null : null
   emit('update:modelValue', match)
@@ -51,19 +58,8 @@ function formatSenderLabel(label: string | null | undefined, address: string): s
 </script>
 
 <template>
-  <div class="composer-sender px-4 pt-4 pb-0">
-    <v-text-field
-      v-if="options.length === 1"
-      :model-value="singleOptionLabel"
-      label="From"
-      variant="outlined"
-      density="compact"
-      readonly
-      class="mb-2"
-    />
-
+  <div v-if="options.length !== 1" class="composer-sender px-4 pt-4 pb-0">
     <v-select
-      v-else
       :model-value="selectedValue"
       :items="items"
       item-title="title"

src/components/composer/ComposerToolbar.vue

@@ -6,12 +6,14 @@ interface Props {
   status: string
   canSend: boolean
   sending: boolean
+  saving: boolean
 }
 
 defineProps<Props>()
 
 defineEmits<{
   close: []
+  save: []
   send: []
 }>()
 </script>
@@ -37,9 +39,20 @@ defineEmits<{
       {{ status }}
     </span>
 
+    <v-btn
+      class="mr-2"
+      variant="text"
+      :loading="saving"
+      :disabled="sending"
+      prepend-icon="mdi-content-save-outline"
+      @click="$emit('save')"
+    >
+      Save
+    </v-btn>
+
     <v-btn
       color="primary"
-      :disabled="!canSend"
+      :disabled="!canSend || saving"
       :loading="sending"
       prepend-icon="mdi-send"
       @click="$emit('send')"

src/components/settings/AccountsSettings.vue

@@ -40,10 +40,11 @@ const handleAccountSaved = async () => {
       <v-list-item
         v-for="service in servicesStore.services"
         :key="`${service.provider}:${service.identifier}`"
+        :class="{ 'opacity-60': !service.enabled }"
       >
         <template #prepend>
-          <v-avatar color="primary">
-            <v-icon>mdi-email</v-icon>
+          <v-avatar :color="service.enabled ? 'primary' : 'grey'">
+            <v-icon>{{ service.enabled ? 'mdi-email' : 'mdi-email-off' }}</v-icon>
           </v-avatar>
         </template>
 

src/services/compositionService.ts

@@ -9,6 +9,8 @@ import type {
   CompositionDiscardResponse,
   CompositionPatchRequest,
   CompositionPatchResponse,
+  CompositionSaveRequest,
+  CompositionSaveResponse,
   CompositionSendRequest,
   CompositionSendResponse,
   CompositionStageRequest,
@@ -50,6 +52,10 @@ const compositionService = {
     return await post<CompositionPatchRequest, CompositionPatchResponse>('patch', request)
   },
 
+  async save(request: CompositionSaveRequest): Promise<CompositionSaveResponse> {
+    return await post<CompositionSaveRequest, CompositionSaveResponse>('save', request)
+  },
+
   async discard(request: CompositionDiscardRequest): Promise<CompositionDiscardResponse> {
     return await post<CompositionDiscardRequest, CompositionDiscardResponse>('discard', request)
   },

src/services/documentsSelector.ts

@@ -0,0 +1,27 @@
+/**
+ * documentsSelector — bridges the Mail composer to documents_manager's
+ * document/collection picker dialog, resolved at runtime via the integration
+ * store. documents_manager (not the end-user `documents` app) registers this,
+ * since it's the module designed to be depended on by other feature modules;
+ * this mirrors CompositionManager's own ModuleManager-based check on the
+ * backend, which also targets documents_manager.
+ */
+
+import { defineAsyncComponent } from 'vue'
+import { useIntegrationStore } from '@KTXC'
+
+const DOCUMENTS_SELECTOR_POINT = 'documents_selector'
+
+/** True if a document selector dialog has been registered (i.e. documents_manager is enabled). */
+export function documentsSelectorAvailable(): boolean {
+  return useIntegrationStore().getItems(DOCUMENTS_SELECTOR_POINT).length > 0
+}
+
+export function documentsSelectorComponent() {
+  // The integration store prefixes ids with the module handle
+  // (e.g. 'documents_manager.dialog'), so match on the suffix.
+  const entry = useIntegrationStore().getItems(DOCUMENTS_SELECTOR_POINT).find(i => i.id.endsWith('.dialog'))
+  return entry?.component
+    ? defineAsyncComponent(entry.component as () => Promise<unknown>)
+    : null
+}

src/stores/mailCompositionStore.ts

@@ -8,12 +8,14 @@ import type {
   CompositionAttachmentInterface,
   CompositionAttachmentRemoveRequest,
   CompositionPatchRequest,
+  CompositionSaveRequest,
   CompositionStageRequest,
   CompositionStageResponse,
 } from '@/types/composition'
 import { ComposerMode } from '@/types/composer'
 import type { ComposerDraft, ComposerDraftAttachment, ComposerDraftMessage, ComposerSenderIdentity } from '@/types/composer'
 import { EntityObject, MessageAddressObject, ServiceObject } from '@MailManager/models'
+import type { EntityIdentifier } from '@MailManager/types/common'
 import type { MessageAddressInterface } from '@MailManager/types/message'
 
 export const useMailCompositionStore = defineStore('mailCompositionStore', () => {
@@ -122,10 +124,6 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
     stageDraft()
   }
 
-  function closeDraft() {
-    return discardDraft()
-  }
-
   async function stageDraft() {
     if (!activeDraft.value) {
       return null
@@ -188,16 +186,73 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
 
   async function discardDraft() {
     if (!activeDraft.value) {
-      return
+      return true
+    }
+
+    if (autoSaveTimer) {
+      clearTimeout(autoSaveTimer)
+      autoSaveTimer = null
     }
 
     const draftId = activeDraft.value.identifier
+    saving.value = true
     try {
-      await compositionService.discard({ identifier: draftId })
+      const response = await compositionService.discard({ identifier: draftId })
+      if (response.disposition === 'error') {
+        mailUiStore.notify(`Failed to discard draft: ${response.error?.message || 'Unknown error'}`, 'error')
+        return false
+      }
+      activeDraft.value = null
+      return true
     } catch (error) {
       console.error('[Mail][Composer] Failed to discard staged draft:', error)
+      mailUiStore.notify('Failed to discard draft', 'error')
+      return false
     } finally {
+      saving.value = false
+    }
+  }
+
+  async function saveDraft() {
+    if (!activeDraft.value) {
+      return true
+    }
+
+    if (autoSaveTimer) {
+      clearTimeout(autoSaveTimer)
+      autoSaveTimer = null
+    }
+
+    const draft = activeDraft.value
+    const request: CompositionSaveRequest = {
+      identifier: draft.identifier,
+      revision: draft.revision,
+      sender: {
+        provider: draft.sender.service.provider,
+        service: draft.sender.service.identifier,
+        address: draft.sender.address,
+        name: draft.sender.label || null,
+      },
+      message: draft.message,
+    }
+
+    saving.value = true
+    try {
+      const response = await compositionService.save(request)
+      if (response.disposition === 'error') {
+        mailUiStore.notify(`Failed to save draft: ${response.error?.message || 'Unknown error'}`, 'error')
+        return false
+      }
+
       activeDraft.value = null
+      mailUiStore.notify('Draft saved', 'success')
+      return true
+    } catch (error) {
+      console.error('[Mail][Composer] Failed to save draft:', error)
+      mailUiStore.notify('Failed to save draft', 'error')
+      return false
+    } finally {
+      saving.value = false
     }
   }
 
@@ -274,7 +329,7 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
     queueSave(false)
   }
 
-  async function addAttachments(files: File[]) {
+  async function addAttachmentsFromDevice(files: File[]) {
     if (!activeDraft.value || files.length === 0) {
       return
     }
@@ -288,7 +343,7 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
         return [identifier, {
           identifier,
           composition,
-          origin: 'upload',
+          origin: 'device',
           name: file.name,
           type: file.type || 'application/octet-stream',
           size: file.size,
@@ -327,6 +382,66 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
     })
   }
 
+  async function addAttachmentsFromDocuments(items: { identifier: string; name: string; mimeType?: string; size?: number }[]) {
+    if (!activeDraft.value || items.length === 0) {
+      return
+    }
+
+    const composition = activeDraft.value.identifier
+    const attachments = Object.fromEntries(
+      items.map(item => {
+        const identifier = createIdentifier()
+        return [identifier, {
+          identifier,
+          composition,
+          origin: 'documents',
+          name: item.name,
+          type: item.mimeType || 'application/octet-stream',
+          size: item.size ?? 0,
+          source: item.identifier as EntityIdentifier,
+        } satisfies CompositionAttachmentInterface]
+      }),
+    )
+
+    const request: CompositionAttachmentAddRequest = {
+      composition,
+      attachments,
+    }
+
+    const response = await compositionService.attachmentAdd(request)
+
+    if (!activeDraft.value || response.composition !== activeDraft.value.identifier) {
+      return
+    }
+
+    if (response.disposition === 'error') {
+      console.error('[Mail][Composer] Failed to add attachments from documents:', response.error)
+      mailUiStore.notify(`Failed to attach documents: ${response.error?.message || 'Unknown error'}`, 'error')
+      return
+    }
+
+    Object.values(response.attachments).forEach(attachment => {
+      activeDraft.value!.attachments[attachment.identifier] = {
+        identifier: attachment.identifier,
+        composition: attachment.composition,
+        origin: attachment.origin,
+        name: attachment.name,
+        type: attachment.type,
+        size: attachment.size,
+        source: attachment.source,
+      }
+    })
+
+    if (response.failed?.length) {
+      mailUiStore.notify(
+        response.failed.length === 1
+          ? '1 document could not be attached'
+          : `${response.failed.length} documents could not be attached`,
+        'warning',
+      )
+    }
+  }
+
   async function removeAttachment(identifier: string) {
     if (!activeDraft.value) {
       return
@@ -418,23 +533,21 @@ export const useMailCompositionStore = defineStore('mailCompositionStore', () =>
     stageStatus,
     senderIdentities,
     openDraft,
-    closeDraft,
+    saveDraft,
+    discardDraft,
     sendDraft,
     updateSender,
     updateRecipients,
     updateSubject,
     updateBody,
-    addAttachments,
+    addAttachmentsFromDevice,
+    addAttachmentsFromDocuments,
     removeAttachment,
     flushSave,
   }
 })
 
-function buildDraft(
-  mode: ComposerMode,
-  sender: ComposerSenderIdentity,
-  source?: EntityObject | MessageAddressObject | null,
-): ComposerDraft {
+function buildDraft(mode: ComposerMode, sender: ComposerSenderIdentity, source?: EntityObject | MessageAddressObject | null): ComposerDraft {
   const composition = createIdentifier()
   const freshMessage = buildMessage(mode, source)
   const freshAttachments = buildAttachments(composition, mode, source)
@@ -452,10 +565,7 @@ function buildDraft(
   }
 }
 
-function buildMessage(
-  mode: ComposerMode,
-  source: EntityObject | MessageAddressObject | null | undefined,
-): ComposerDraftMessage {
+function buildMessage(mode: ComposerMode, source: EntityObject | MessageAddressObject | null | undefined): ComposerDraftMessage {
   
   if (!source) {
     return emptyMessage()
@@ -521,7 +631,7 @@ function buildAttachments(composition: string, mode: ComposerMode, source?: Enti
     attachments[id] = {
       identifier: id,
       composition: composition,
-      origin: 'source',
+      origin: 'message',
       name: attachment.name || '',
       type: attachment.type || 'application/octet-stream',
       size: attachment.size || 0,

src/types/composer.ts

@@ -11,7 +11,7 @@ export enum ComposerMode {
 export interface ComposerDraftAttachment {
   identifier: string
   composition: string
-  origin: 'source' | 'upload'
+  origin: 'device' | 'message' | 'documents'
   name: string
   type: string
   size: number

src/types/composition.ts

@@ -22,7 +22,7 @@ export interface CompositionMessageInterface {
 export interface CompositionAttachmentInterface {
   identifier: string
   composition: string
-  origin: 'source' | 'upload'
+  origin: 'device' | 'message' | 'documents'
   name: string
   type: string
   size: number
@@ -58,6 +58,17 @@ export interface CompositionPatchResponse {
   message: CompositionMessageInterface
 }
 
+export interface CompositionSaveRequest extends CompositionPatchRequest {}
+
+export interface CompositionSaveResponse {
+  identifier: string
+  disposition: 'saved' | 'error'
+  error?: {
+    type: string
+    message: string
+  }
+}
+
 export interface CompositionDiscardRequest {
   identifier: string
 }
@@ -94,13 +105,17 @@ export interface CompositionAttachmentAddRequest {
 }
 
 export interface CompositionAttachmentAddResponse {
-  disposition: 'added' | 'error'
+  disposition: 'added' | 'partial' | 'error'
   error?: {
     type: string
     message: string
   }
   composition: string
   attachments: Record<string, CompositionAttachmentInterface>
+  failed?: {
+    identifier: string
+    message: string
+  }[]
 }
 
 export interface CompositionAttachmentRemoveRequest {

tests/php/Unit/CompositionManagerTest.php

@@ -0,0 +1,375 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXT\Mail\Tests\Unit;
+
+use KTXC\Module\ModuleManager;
+use KTXC\Module\ModuleObject;
+use KTXF\Event\EventDispatcherInterface;
+use KTXF\Documents\Entity\EntityBaseInterface;
+use KTXF\Documents\Entity\EntityPropertiesBaseInterface;
+use KTXM\Mail\CompositionManager;
+use KTXM\Mail\CompositionSavedEvent;
+use KTXM\Mail\Stores\CompositionStore;
+use PHPUnit\Framework\MockObject\Stub;
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface;
+
+// KTXM\MailManager\Manager and KTXM\DocumentsManager\Manager live in sibling
+// modules. This module's isolated test bootstrap only autoloads its own PSR-4
+// map plus the server's KTXC/KTXF namespaces (see tests/php/bootstrap.php), so
+// sibling-module classes are not otherwise resolvable here. Require them
+// directly so PHPUnit can reflect on the real classes to build mocks; both
+// files only depend on already-autoloadable KTXC/KTXF types. Skipped
+// gracefully in setUp() if this module is ever checked out standalone.
+$mailManagerFile = dirname(__DIR__, 4) . '/mail_manager/lib/Manager.php';
+$documentsManagerFile = dirname(__DIR__, 4) . '/documents_manager/lib/Manager.php';
+if (is_file($mailManagerFile)) {
+    require_once $mailManagerFile;
+}
+if (is_file($documentsManagerFile)) {
+    require_once $documentsManagerFile;
+}
+
+final class CompositionManagerTest extends TestCase {
+
+    private const TENANT_ID = 'tenant-1';
+    private const USER_ID = 'user-1';
+
+    private string $rootDir;
+    private CompositionStore $compositionStore;
+
+    protected function setUp(): void {
+        if (!class_exists(\KTXM\MailManager\Manager::class) || !class_exists(\KTXM\DocumentsManager\Manager::class)) {
+            $this->markTestSkipped('mail_manager and documents_manager modules are not available alongside this checkout');
+        }
+
+        $this->rootDir = sys_get_temp_dir() . '/ktrix-mail-composition-test-' . uniqid();
+        mkdir($this->rootDir, 0755, true);
+        $this->compositionStore = new CompositionStore($this->rootDir);
+    }
+
+    protected function tearDown(): void {
+        $this->deleteDir($this->rootDir);
+    }
+
+    public function testStageInitializesDirtyRemoteState(): void {
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $manager = $this->makeManager($documentsManager);
+
+        $response = $manager->stage(
+            self::TENANT_ID,
+            self::USER_ID,
+            'draft-new',
+            'new',
+            ['address' => 'sender@example.com'],
+            ['subject' => 'Draft'],
+        );
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, 'draft-new');
+        $this->assertArrayNotHasKey('remote', $response);
+        $this->assertSame([
+            'status' => 'dirty',
+            'entity' => null,
+            'error' => null,
+        ], $snapshot['remote']);
+    }
+
+    public function testStageQueuesDraftSynchronizationAfterLocalSave(): void {
+        $events = $this->createMock(EventDispatcherInterface::class);
+        $events->expects($this->once())
+            ->method('dispatch')
+            ->with($this->callback(static fn(CompositionSavedEvent $event): bool =>
+                $event->tenantIdentifier() === self::TENANT_ID
+                && $event->userIdentifier() === self::USER_ID
+                && $event->compositionIdentifier() === 'draft-event'
+                && $event->revision() === 1));
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $manager = $this->makeManager($documentsManager, events: $events);
+
+        $result = $manager->stage(
+            self::TENANT_ID,
+            self::USER_ID,
+            'draft-event',
+            'fresh',
+            ['address' => 'sender@example.com'],
+            ['subject' => 'Draft'],
+        );
+
+        $this->assertSame('staged', $result['disposition']);
+    }
+
+    public function testStageSurfacesEventQueueingFailureAfterLocalSave(): void {
+        $events = $this->createStub(EventDispatcherInterface::class);
+        $events->method('dispatch')->willThrowException(new \RuntimeException('No active event scope'));
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $manager = $this->makeManager($documentsManager, events: $events);
+
+        try {
+            $manager->stage(
+                self::TENANT_ID,
+                self::USER_ID,
+                'draft-event-failure',
+                'fresh',
+                ['address' => 'sender@example.com'],
+                ['subject' => 'Draft'],
+            );
+            $this->fail('Event dispatch failure should be surfaced');
+        } catch (\RuntimeException $exception) {
+            $this->assertSame('No active event scope', $exception->getMessage());
+        }
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, 'draft-event-failure');
+        $this->assertSame('dirty', $snapshot['remote']['status']);
+    }
+
+    public function testPatchMarksExistingRemoteStateDirty(): void {
+        $compositionId = $this->stageEmptyComposition();
+        $setSynced = static function (?array $snapshot): array {
+            $snapshot['revision'] = 1;
+            $snapshot['remote'] = [
+                'status' => 'synced',
+                'entity' => 'provider:service:drafts:123',
+                'error' => 'old error',
+            ];
+            return $snapshot;
+        };
+        $this->compositionStore->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            $compositionId,
+            $setSynced,
+        );
+
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $events = $this->createMock(EventDispatcherInterface::class);
+        $events->expects($this->once())
+            ->method('dispatch')
+            ->with($this->callback(static fn(CompositionSavedEvent $event): bool =>
+                $event->compositionIdentifier() === $compositionId
+                && $event->revision() === 2));
+        $manager = $this->makeManager($documentsManager, events: $events);
+        $result = $manager->patch(self::TENANT_ID, self::USER_ID, $compositionId, [
+            'revision' => 2,
+            'sender' => ['address' => 'sender@example.com'],
+            'message' => ['subject' => 'Changed'],
+        ]);
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, $compositionId);
+        $this->assertSame('patched', $result['disposition']);
+        $this->assertSame('dirty', $snapshot['remote']['status']);
+        $this->assertSame('provider:service:drafts:123', $snapshot['remote']['entity']);
+        $this->assertNull($snapshot['remote']['error']);
+    }
+
+    public function testAttachmentAddFromDocumentsHappyPath(): void {
+        $compositionId = $this->stageEmptyComposition();
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $documentsManager->method('entityFetchBulk')->willReturn([
+            $this->makeEntity('default:personal:root:doc1', 'hello.txt', 'text/plain'),
+        ]);
+        $documentsManager->method('entityReadStream')->willReturn($this->makeStream('hello world'));
+
+        $events = $this->createMock(EventDispatcherInterface::class);
+        $events->expects($this->once())
+            ->method('dispatch')
+            ->with($this->callback(static fn(CompositionSavedEvent $event): bool =>
+                $event->compositionIdentifier() === $compositionId));
+        $manager = $this->makeManager($documentsManager, events: $events);
+
+        $result = $manager->attachmentAdd(self::TENANT_ID, self::USER_ID, $compositionId, [
+            'identifier' => 'attach-1',
+            'origin' => 'documents',
+            'source' => 'default:personal:root:doc1',
+        ]);
+
+        $this->assertSame('added', $result['disposition']);
+        $this->assertCount(1, $result['attachments']);
+        $this->assertSame([], $result['failed']);
+
+        $attachment = $result['attachments']['attach-1'];
+        $this->assertSame('documents', $attachment['origin']);
+        $this->assertSame('default:personal:root:doc1', $attachment['source']);
+        $this->assertSame('hello.txt', $attachment['name']);
+        $this->assertSame('text/plain', $attachment['type']);
+        $this->assertSame(strlen('hello world'), $attachment['size']);
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, $compositionId);
+        $this->assertSame('dirty', $snapshot['remote']['status']);
+        $this->assertNull($snapshot['remote']['entity']);
+        $this->assertNull($snapshot['remote']['error']);
+    }
+
+    public function testAttachmentAddFromDocumentsPartialFailure(): void {
+        $compositionId = $this->stageEmptyComposition();
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        // only doc1 is returned even though doc1 and doc2 are both requested
+        $documentsManager->method('entityFetchBulk')->willReturn([
+            $this->makeEntity('default:personal:root:doc1', 'hello.txt', 'text/plain'),
+        ]);
+        $documentsManager->method('entityReadStream')->willReturn($this->makeStream('hello world'));
+
+        $manager = $this->makeManager($documentsManager);
+
+        $result = $manager->attachmentAdd(
+            self::TENANT_ID,
+            self::USER_ID,
+            $compositionId,
+            ['identifier' => 'attach-1', 'origin' => 'documents', 'source' => 'default:personal:root:doc1'],
+            ['identifier' => 'attach-2', 'origin' => 'documents', 'source' => 'default:personal:root:doc2'],
+        );
+
+        $this->assertSame('partial', $result['disposition']);
+        $this->assertCount(1, $result['attachments']);
+        $this->assertCount(1, $result['failed']);
+        $this->assertSame('default:personal:root:doc2', $result['failed'][0]['identifier']);
+    }
+
+    public function testAttachmentAddMixedUploadAndDocuments(): void {
+        $compositionId = $this->stageEmptyComposition();
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $documentsManager->method('entityFetchBulk')->willReturn([
+            $this->makeEntity('default:personal:root:doc1', 'hello.txt', 'text/plain'),
+        ]);
+        $documentsManager->method('entityReadStream')->willReturn($this->makeStream('hello world'));
+
+        $manager = $this->makeManager($documentsManager);
+
+        $result = $manager->attachmentAdd(
+            self::TENANT_ID,
+            self::USER_ID,
+            $compositionId,
+            ['identifier' => 'attach-upload', 'origin' => 'device', 'name' => 'upload.txt', 'type' => 'text/plain', 'data' => base64_encode('uploaded bytes')],
+            ['identifier' => 'attach-doc', 'origin' => 'documents', 'source' => 'default:personal:root:doc1'],
+        );
+
+        $this->assertSame('added', $result['disposition']);
+        $this->assertCount(2, $result['attachments']);
+        $this->assertSame('device', $result['attachments']['attach-upload']['origin']);
+        $this->assertSame('documents', $result['attachments']['attach-doc']['origin']);
+    }
+
+    public function testAttachmentAddCompositionNotFound(): void {
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        $manager = $this->makeManager($documentsManager);
+
+        $result = $manager->attachmentAdd(self::TENANT_ID, self::USER_ID, 'unknown-composition', [
+            'identifier' => 'attach-1',
+            'origin' => 'documents',
+            'source' => 'default:personal:root:doc1',
+        ]);
+
+        $this->assertSame('error', $result['disposition']);
+        $this->assertSame('composition_not_found', $result['error']['type']);
+    }
+
+    public function testAttachmentAddDocumentsModuleUnavailable(): void {
+        $compositionId = $this->stageEmptyComposition();
+        $documentsManager = $this->createStub(\KTXM\DocumentsManager\Manager::class);
+        // documents_manager is not installed/enabled: attachmentAdd must still
+        // work for the composition itself, just report the sourced entry as failed
+        // rather than throwing (e.g. from a failed DI resolution).
+        $manager = $this->makeManager($documentsManager, documentsModuleEnabled: false);
+
+        $result = $manager->attachmentAdd(self::TENANT_ID, self::USER_ID, $compositionId, [
+            'identifier' => 'attach-1',
+            'origin' => 'documents',
+            'source' => 'default:personal:root:doc1',
+        ]);
+
+        $this->assertSame('error', $result['disposition']);
+        $this->assertCount(0, $result['attachments']);
+        $this->assertCount(1, $result['failed']);
+        $this->assertSame('default:personal:root:doc1', $result['failed'][0]['identifier']);
+        $this->assertStringContainsString('not installed or enabled', $result['failed'][0]['message']);
+    }
+
+    private function makeManager(
+        Stub $documentsManager,
+        bool $documentsModuleEnabled = true,
+        ?EventDispatcherInterface $events = null,
+    ): CompositionManager {
+        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
+
+        $moduleManager = $this->createStub(ModuleManager::class);
+        if ($documentsModuleEnabled) {
+            $module = $this->createStub(ModuleObject::class);
+            $module->method('enabled')->willReturn(true);
+            $moduleManager->method('fetch')->willReturn($module);
+        } else {
+            $moduleManager->method('fetch')->willReturn(null);
+        }
+
+        $container = $this->createStub(ContainerInterface::class);
+        $container->method('has')->willReturn($documentsModuleEnabled);
+        $container->method('get')->willReturn($documentsManager);
+
+        return new CompositionManager(
+            container: $container,
+            moduleManager: $moduleManager,
+            compositionStore: $this->compositionStore,
+            mailManager: $mailManager,
+            events: $events ?? $this->createStub(EventDispatcherInterface::class),
+        );
+    }
+
+    private function stageEmptyComposition(): string {
+        $compositionId = 'draft-' . uniqid();
+        $saveComposition = static fn(): array => [
+            'identifier' => $compositionId,
+            'attachments' => [],
+        ];
+
+        $this->compositionStore->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            $compositionId,
+            $saveComposition,
+        );
+        return $compositionId;
+    }
+
+    private function makeEntity(string $urn, string $label, string $mime): EntityBaseInterface&Stub {
+        $properties = $this->createStub(EntityPropertiesBaseInterface::class);
+        $properties->method('getLabel')->willReturn($label);
+        $properties->method('getMime')->willReturn($mime);
+        $properties->method('size')->willReturn(0);
+
+        $entity = $this->createStub(EntityBaseInterface::class);
+        $entity->method('urn')->willReturn($urn);
+        $entity->method('getProperties')->willReturn($properties);
+
+        return $entity;
+    }
+
+    /** @return resource */
+    private function makeStream(string $contents) {
+        $resource = fopen('php://memory', 'r+');
+        fwrite($resource, $contents);
+        rewind($resource);
+        return $resource;
+    }
+
+    private function deleteDir(string $path): void {
+        if (!is_dir($path)) {
+            return;
+        }
+
+        foreach (scandir($path) ?: [] as $entry) {
+            if ($entry === '.' || $entry === '..') {
+                continue;
+            }
+
+            $child = $path . '/' . $entry;
+            if (is_dir($child)) {
+                $this->deleteDir($child);
+                continue;
+            }
+
+            unlink($child);
+        }
+
+        rmdir($path);
+    }
+}

tests/php/Unit/CompositionSavedEventTest.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXT\Mail\Tests\Unit;
+
+use KTXF\Event\DeliveryMode;
+use KTXF\Event\EventListenerRegistrarInterface;
+use KTXM\Mail\CompositionSavedEvent;
+use KTXM\Mail\CompositionSyncListener;
+use KTXM\Mail\Module;
+use PHPUnit\Framework\TestCase;
+
+final class CompositionSavedEventTest extends TestCase {
+
+    public function testCarriesOnlySynchronizationCoordinates(): void {
+        $event = new CompositionSavedEvent('tenant-1', 'user-1', 'draft-1', 7);
+
+        $this->assertSame(CompositionSavedEvent::class, $event->label());
+        $this->assertSame('tenant-1', $event->tenantIdentifier());
+        $this->assertSame('user-1', $event->userIdentifier());
+        $this->assertSame('draft-1', $event->compositionIdentifier());
+        $this->assertSame(7, $event->revision());
+        $this->assertSame([
+            'userId' => 'user-1',
+            'compositionId' => 'draft-1',
+            'revision' => 7,
+        ], $event->context());
+    }
+
+    public function testModuleRegistersDeferredCompositionSyncListener(): void {
+        $events = $this->createMock(EventListenerRegistrarInterface::class);
+        $events->expects($this->once())
+            ->method('listen')
+            ->with(
+                'mail',
+                CompositionSavedEvent::class,
+                CompositionSyncListener::class,
+                'onCompositionSaved',
+                DeliveryMode::Deferred,
+            );
+
+        (new Module($events))->boot();
+    }
+}

tests/php/Unit/CompositionStoreTest.php

@@ -0,0 +1,153 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXT\Mail\Tests\Unit;
+
+use JsonException;
+use KTXM\Mail\Stores\CompositionStore;
+use PHPUnit\Framework\TestCase;
+
+final class CompositionStoreTest extends TestCase {
+
+    private const TENANT_ID = 'tenant-1';
+    private const USER_ID = 'user-1';
+    private const COMPOSITION_ID = 'draft-1';
+
+    private string $rootDir;
+    private CompositionStore $store;
+
+    protected function setUp(): void {
+        $this->rootDir = sys_get_temp_dir() . '/ktrix-mail-store-test-' . uniqid('', true);
+        mkdir($this->rootDir, 0755, true);
+        $this->store = new CompositionStore($this->rootDir);
+    }
+
+    protected function tearDown(): void {
+        $this->deleteDir($this->rootDir);
+    }
+
+    public function testFailedReplacementPreservesPreviousSnapshot(): void {
+        $initial = ['identifier' => self::COMPOSITION_ID, 'revision' => 1];
+        $this->saveSnapshot($initial);
+
+        $resource = fopen('php://memory', 'r');
+        try {
+            $saveInvalidSnapshot = static fn(): array => [
+                'identifier' => self::COMPOSITION_ID,
+                'invalid' => $resource,
+            ];
+            $this->store->compositionSave(
+                self::TENANT_ID,
+                self::USER_ID,
+                self::COMPOSITION_ID,
+                $saveInvalidSnapshot,
+            );
+            $this->fail('Saving a value that cannot be encoded as JSON should fail');
+        } catch (JsonException) {
+            $this->assertSame(
+                $initial,
+                $this->store->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID),
+            );
+        } finally {
+            fclose($resource);
+        }
+    }
+
+    public function testUpdateCanLeaveSnapshotUnchanged(): void {
+        $initial = ['identifier' => self::COMPOSITION_ID, 'revision' => 1];
+        $this->saveSnapshot($initial);
+
+        $leaveUnchanged = static fn(?array $snapshot): ?array => null;
+        $updated = $this->store->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            $leaveUnchanged,
+        );
+
+        $this->assertNull($updated);
+        $this->assertSame(
+            $initial,
+            $this->store->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID),
+        );
+    }
+
+    public function testConcurrentUpdatesDoNotLoseChanges(): void {
+        if (!function_exists('pcntl_fork')) {
+            $this->markTestSkipped('The pcntl extension is required for the concurrency test');
+        }
+
+        $this->saveSnapshot([
+            'identifier' => self::COMPOSITION_ID,
+            'updates' => 0,
+        ]);
+
+        $childPid = pcntl_fork();
+        if ($childPid === -1) {
+            $this->fail('Unable to fork the concurrency test process');
+        }
+
+        if ($childPid === 0) {
+            $this->incrementAfterDelay();
+            exit(0);
+        }
+
+        $this->incrementAfterDelay();
+        pcntl_waitpid($childPid, $status);
+
+        $this->assertTrue(pcntl_wifexited($status));
+        $this->assertSame(0, pcntl_wexitstatus($status));
+        $this->assertSame(
+            2,
+            $this->store->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID)['updates'],
+        );
+    }
+
+    private function incrementAfterDelay(): void {
+        $incrementSnapshot = static function (?array $snapshot): array {
+            usleep(200_000);
+            $snapshot['updates']++;
+            return $snapshot;
+        };
+
+        $this->store->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            $incrementSnapshot,
+        );
+    }
+
+    private function saveSnapshot(array $snapshot): void {
+        $saveSnapshot = static fn(): array => $snapshot;
+        $this->store->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            $saveSnapshot,
+        );
+    }
+
+    private function deleteDir(string $path): void {
+        if (!is_dir($path)) {
+            return;
+        }
+
+        foreach (scandir($path) ?: [] as $entry) {
+            if ($entry === '.' || $entry === '..') {
+                continue;
+            }
+
+            $child = $path . '/' . $entry;
+            if (is_dir($child)) {
+                $this->deleteDir($child);
+                continue;
+            }
+
+            unlink($child);
+        }
+
+        rmdir($path);
+    }
+}

tests/php/Unit/CompositionSynchronizationTest.php

@@ -0,0 +1,331 @@
+<?php
+
+declare(strict_types=1);
+
+namespace KTXT\Mail\Tests\Unit;
+
+use KTXC\Module\ModuleManager;
+use KTXF\Event\EventDispatcherInterface;
+use KTXF\Mail\Collection\CollectionBaseInterface;
+use KTXF\Mail\Entity\EntityBaseInterface;
+use KTXF\Mail\Entity\EntityMutableInterface;
+use KTXF\Mail\Object\MessagePropertiesMutableInterface;
+use KTXF\Mail\Service\ServiceBaseInterface;
+use KTXF\Mail\Service\ServiceEntityMutableInterface;
+use KTXF\Resource\Filter\IFilter;
+use KTXF\Resource\Identifier\CollectionIdentifier;
+use KTXF\Resource\Identifier\EntityIdentifier;
+use KTXM\Mail\CompositionManager;
+use KTXM\Mail\Stores\CompositionStore;
+use PHPUnit\Framework\MockObject\Stub;
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface;
+
+$mailManagerFile = dirname(__DIR__, 4) . '/mail_manager/lib/Manager.php';
+if (is_file($mailManagerFile)) {
+    require_once $mailManagerFile;
+}
+
+final class CompositionSynchronizationTest extends TestCase {
+
+    private const TENANT_ID = 'tenant-1';
+    private const USER_ID = 'user-1';
+    private const COMPOSITION_ID = 'draft-1';
+
+    private string $rootDir;
+    private CompositionStore $compositionStore;
+
+    protected function setUp(): void {
+        if (!class_exists(\KTXM\MailManager\Manager::class)) {
+            $this->markTestSkipped('mail_manager module is not available alongside this checkout');
+        }
+
+        $this->rootDir = sys_get_temp_dir() . '/ktrix-mail-sync-test-' . uniqid('', true);
+        mkdir($this->rootDir, 0755, true);
+        $this->compositionStore = new CompositionStore($this->rootDir);
+    }
+
+    protected function tearDown(): void {
+        $this->deleteDir($this->rootDir);
+    }
+
+    public function testCreatesDraftInConfiguredCollection(): void {
+        $this->stageComposition();
+        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
+        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
+        $created = $this->entity('provider', 'service', 'drafts', 'created-1');
+
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn($service);
+        $mailManager->expects($this->once())
+            ->method('entityCreate')
+            ->with(
+                self::TENANT_ID,
+                self::USER_ID,
+                $this->callback(static fn(CollectionIdentifier $target): bool => (string)$target === 'provider:service:drafts'),
+                $properties,
+            )
+            ->willReturn($created);
+
+        $compositionManager = $this->compositionManager($mailManager);
+
+        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+        $replayed = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+        $this->assertSame('saved', $result['disposition']);
+        $this->assertSame('saved', $replayed['disposition']);
+        $this->assertSame('synced', $snapshot['remote']['status']);
+        $this->assertSame('provider:service:drafts:created-1', $snapshot['remote']['entity']);
+        $this->assertNull($snapshot['remote']['error']);
+    }
+
+    public function testModifiesExistingDraftAndStoresAuthoritativeIdentifier(): void {
+        $this->stageComposition('provider:service:drafts:old-1');
+        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
+        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
+        $modified = $this->entity('provider', 'service', 'drafts', 'replacement-2');
+
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn($service);
+        $mailManager->expects($this->once())
+            ->method('entityModify')
+            ->with(
+                self::TENANT_ID,
+                self::USER_ID,
+                $this->callback(static fn(EntityIdentifier $target): bool => (string)$target === 'provider:service:drafts:old-1'),
+                $properties,
+            )
+            ->willReturn($modified);
+
+        $compositionManager = $this->compositionManager($mailManager);
+
+        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+        $this->assertSame('saved', $result['disposition']);
+        $this->assertSame('provider:service:drafts:replacement-2', $snapshot['remote']['entity']);
+    }
+
+    public function testResolvesDraftCollectionByRoleWhenNoTargetIsConfigured(): void {
+        $this->stageComposition();
+        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
+        $service = $this->mutableService([], $properties);
+        $filter = $this->createMock(IFilter::class);
+        $filter->expects($this->once())->method('condition')->with('role', 'drafts');
+        $service->method('collectionListFilter')->willReturn($filter);
+        $collection = $this->createStub(CollectionBaseInterface::class);
+        $collection->method('identifier')->willReturn('role-drafts');
+        $service->method('collectionList')->willReturn([$collection]);
+
+        $created = $this->entity('provider', 'service', 'role-drafts', 'created-1');
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn($service);
+        $mailManager->expects($this->once())
+            ->method('entityCreate')
+            ->with(
+                self::TENANT_ID,
+                self::USER_ID,
+                $this->callback(static fn(CollectionIdentifier $target): bool => (string)$target === 'provider:service:role-drafts'),
+                $properties,
+            )
+            ->willReturn($created);
+
+        $compositionManager = $this->compositionManager($mailManager);
+
+        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+
+        $this->assertSame('saved', $result['disposition']);
+    }
+
+    public function testRecordsFailureWhileKeepingLocalDraftStaged(): void {
+        $this->stageComposition();
+        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn(null);
+        $compositionManager = $this->compositionManager($mailManager);
+
+        $result = $compositionManager->synchronize(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+        $this->assertSame('staged', $result['disposition']);
+        $this->assertArrayHasKey('error', $result);
+        $this->assertSame('failed', $snapshot['remote']['status']);
+        $this->assertSame($result['error'], $snapshot['remote']['error']);
+        $this->assertNull($snapshot['remote']['entity']);
+    }
+
+    public function testInlineSaveSynchronizesAndPurgesLocalComposition(): void {
+        $this->stageComposition();
+        $properties = $this->createStub(MessagePropertiesMutableInterface::class);
+        $service = $this->mutableService(['draftTarget' => 'drafts'], $properties);
+        $created = $this->entity('provider', 'service', 'drafts', 'created-inline');
+
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn($service);
+        $mailManager->expects($this->once())
+            ->method('entityCreate')
+            ->willReturn($created);
+
+        $result = $this->compositionManager($mailManager)->save(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            [
+                'revision' => 2,
+                'sender' => ['address' => 'sender@example.com'],
+                'message' => ['subject' => 'Saved inline'],
+            ],
+        );
+
+        $this->assertSame('saved', $result['disposition']);
+        $this->assertNull($this->compositionStore->compositionFetch(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+        ));
+    }
+
+    public function testInlineSaveFailureKeepsLocalComposition(): void {
+        $this->stageComposition();
+        $mailManager = $this->createStub(\KTXM\MailManager\Manager::class);
+        $mailManager->method('serviceFindByAddress')->willReturn(null);
+
+        $result = $this->compositionManager($mailManager)->save(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            [
+                'revision' => 2,
+                'sender' => ['address' => 'sender@example.com'],
+                'message' => ['subject' => 'Keep this draft'],
+            ],
+        );
+
+        $snapshot = $this->compositionStore->compositionFetch(self::TENANT_ID, self::USER_ID, self::COMPOSITION_ID);
+        $this->assertSame('error', $result['disposition']);
+        $this->assertSame('composition_save_failed', $result['error']['type']);
+        $this->assertSame('Keep this draft', $snapshot['message']['subject']);
+        $this->assertSame('failed', $snapshot['remote']['status']);
+    }
+
+    public function testDiscardDeletesRemoteDraftBeforePurgingLocalComposition(): void {
+        $remote = 'provider:service:drafts:remote-1';
+        $this->stageComposition($remote);
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->expects($this->once())
+            ->method('entityDelete')
+            ->with(
+                self::TENANT_ID,
+                self::USER_ID,
+                $this->callback(static fn(EntityIdentifier $target): bool => (string)$target === $remote),
+            )
+            ->willReturn([$remote => ['disposition' => 'deleted']]);
+
+        $result = $this->compositionManager($mailManager)->discard(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+        );
+
+        $this->assertSame('discarded', $result['disposition']);
+        $this->assertNull($this->compositionStore->compositionFetch(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+        ));
+    }
+
+    public function testRemoteDiscardFailureKeepsLocalComposition(): void {
+        $remote = 'provider:service:drafts:remote-1';
+        $this->stageComposition($remote);
+        $mailManager = $this->createMock(\KTXM\MailManager\Manager::class);
+        $mailManager->method('entityDelete')
+            ->willReturn([$remote => ['disposition' => 'error', 'error' => 'Provider unavailable']]);
+
+        $result = $this->compositionManager($mailManager)->discard(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+        );
+
+        $this->assertSame('error', $result['disposition']);
+        $this->assertSame('Provider unavailable', $result['error']['message']);
+        $this->assertNotNull($this->compositionStore->compositionFetch(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+        ));
+    }
+
+    private function stageComposition(?string $remoteEntity = null): void {
+        $saveComposition = static fn(): array => [
+            'identifier' => self::COMPOSITION_ID,
+            'sender' => ['address' => 'sender@example.com'],
+            'message' => ['subject' => 'Draft'],
+            'attachments' => [],
+            'remote' => [
+                'status' => 'dirty',
+                'entity' => $remoteEntity,
+                'error' => null,
+            ],
+        ];
+        $this->compositionStore->compositionSave(
+            self::TENANT_ID,
+            self::USER_ID,
+            self::COMPOSITION_ID,
+            $saveComposition,
+        );
+    }
+
+    private function mutableService(array $auxiliary, MessagePropertiesMutableInterface $properties): ServiceBaseInterface&ServiceEntityMutableInterface&Stub {
+        $service = $this->createStubForIntersectionOfInterfaces([
+            ServiceBaseInterface::class,
+            ServiceEntityMutableInterface::class,
+        ]);
+        $entity = $this->createStub(EntityMutableInterface::class);
+        $entity->method('getProperties')->willReturn($properties);
+        $service->method('provider')->willReturn('provider');
+        $service->method('identifier')->willReturn('service');
+        $service->method('getEnabled')->willReturn(true);
+        $service->method('getAuxiliary')->willReturn($auxiliary);
+        $service->method('entityFresh')->willReturn($entity);
+        return $service;
+    }
+
+    private function compositionManager(\KTXM\MailManager\Manager $mailManager): CompositionManager {
+        return new CompositionManager(
+            container: $this->createStub(ContainerInterface::class),
+            moduleManager: $this->createStub(ModuleManager::class),
+            compositionStore: $this->compositionStore,
+            mailManager: $mailManager,
+            events: $this->createStub(EventDispatcherInterface::class),
+        );
+    }
+
+    private function entity(string $provider, string $service, string $collection, string $identifier): EntityBaseInterface&Stub {
+        $entity = $this->createStub(EntityBaseInterface::class);
+        $entity->method('provider')->willReturn($provider);
+        $entity->method('service')->willReturn($service);
+        $entity->method('collection')->willReturn($collection);
+        $entity->method('identifier')->willReturn($identifier);
+        return $entity;
+    }
+
+    private function deleteDir(string $path): void {
+        if (!is_dir($path)) {
+            return;
+        }
+        foreach (scandir($path) ?: [] as $entry) {
+            if ($entry === '.' || $entry === '..') {
+                continue;
+            }
+            $child = $path . '/' . $entry;
+            if (is_dir($child)) {
+                $this->deleteDir($child);
+            } else {
+                unlink($child);
+            }
+        }
+        rmdir($path);
+    }
+}