fix: Bug - Sending files and attachment issues

Hydrate playable media after disk receive, relay file-announce to sibling
devices via account_sync, bind DM attachments to pre-allocated message ids,
and improve gallery retry/cancel UX with bounded parallel auto-downloads.

Co-authored-by: Cursor <cursoragent@cursor.com>

toju-app/src/app/domains/attachment/domain/logic/attachment.logic.spec.ts

@@ -1,6 +1,8 @@
 import {
   getWatchedAttachmentRoomIdFromUrl,
+  isAttachmentPendingMediaHydration,
   isDirectMessageAttachmentRoomId,
+  isPlayableAttachmentMedia,
   shouldCopyUploaderMediaToAppData,
   shouldCopyLargeUploaderFileToAppData,
   shouldStreamAttachmentReceiveToDisk,
@@ -83,6 +85,24 @@ describe('attachment logic', () => {
     }, capabilities)).toBe(true);
   });
 
+  it('identifies playable media pending hydration from disk paths', () => {
+    expect(isPlayableAttachmentMedia({ mime: 'video/mp4' })).toBe(true);
+    expect(isPlayableAttachmentMedia({ mime: 'image/png' })).toBe(false);
+
+    expect(isAttachmentPendingMediaHydration({
+      mime: 'audio/mpeg',
+      available: true,
+      savedPath: '/data/song.mp3'
+    })).toBe(true);
+
+    expect(isAttachmentPendingMediaHydration({
+      mime: 'audio/mpeg',
+      available: true,
+      objectUrl: 'file:///data/song.mp3',
+      savedPath: '/data/song.mp3'
+    })).toBe(false);
+  });
+
   it('receives browser-sized files in memory when disk streaming is unavailable', () => {
     const browserCapabilities = {
       canStreamToDisk: false,