feat: message and attachment download

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

src/stores/mailStore.ts

@@ -633,6 +633,33 @@ export const useMailStore = defineStore('mailStore', () => {
     }
   }
 
+  async function downloadMessage(entity: EntityObject, index?: number) {
+    const target = entity.identifier
+    let part = null
+
+    if (index !== undefined) {
+      part = entity.properties.attachments?.[Number(index)] ?? null
+    }
+
+    try {
+      await entitiesStore.download(target, part)
+    } catch (error) {
+      const messageText = error instanceof Error
+        ? error.message
+        : index === undefined
+          ? 'Failed to download message'
+          : 'Failed to download attachment'
+      console.error(
+        index === undefined
+          ? '[Mail][Operations] Failed to download message:'
+          : '[Mail][Operations] Failed to download attachment:',
+        error,
+      )
+      notify(messageText, 'error')
+      throw error
+    }
+  }
+
   function notify(message: string, color: 'success' | 'error' | 'info' | 'warning' = 'success') {
     showSnackbar({ message, color })
   }
@@ -672,6 +699,7 @@ export const useMailStore = defineStore('mailStore', () => {
     deleteMessages,
     deleteFolder,
     moveMessages,
+    downloadMessage,
     moveFolder,
     renameFolder,
     notify,