feat: attachment preview

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

src/stores/mailStore.ts

@@ -5,7 +5,7 @@ import { useEntitiesStore } from '@MailManager/stores/entitiesStore'
 import { useServicesStore } from '@MailManager/stores/servicesStore'
 import { useMailSync } from '@MailManager/composables/useMailSync'
 import type { ServiceIdentifier, CollectionIdentifier, EntityIdentifier } from '@MailManager/types/common'
-import type { EntityTransmitRequest } from '@MailManager/types/entity'
+import type { EntityTransmitRequest, EntityBlobSelector } from '@MailManager/types/entity'
 import type { MessageAddressInterface, MessageInterface, MessagePartInterface } from '@MailManager/types/message'
 import { ServiceObject, type CollectionObject, type EntityObject } from '@MailManager/models'
 import { CollectionPropertiesObject } from '@MailManager/models/collection'
@@ -571,6 +571,20 @@ export const useMailStore = defineStore('mailStore', () => {
     }
   }
 
+  async function attachmentBlob(entity: EntityObject, part: MessagePartInterface): Promise<Blob> {
+    const selector: EntityBlobSelector = {
+      blobId: part.blobId ?? undefined,
+      partId: part.partId ?? undefined,
+      cid: part.cid ?? undefined,
+    }
+    const results = await entitiesStore.blobs(entity.identifier, [selector])
+    const blob = results[0]?.blob
+    if (!blob) {
+      throw new Error('Attachment content unavailable')
+    }
+    return blob
+  }
+
   // ── Exports ───────────────────────────────────────────────────────────────
 
   return {
@@ -607,6 +621,7 @@ export const useMailStore = defineStore('mailStore', () => {
     deleteFolder,
     moveMessages,
     downloadMessage,
+    attachmentBlob,
     moveFolder,
     renameFolder,
     isServiceFolderLoading,