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/direct-message/application/services/direct-message.service.ts

@@ -213,7 +213,12 @@ export class DirectMessageService {
     }
   }
 
-  async sendMessage(conversationId: string, content: string, replyToId?: string): Promise<DirectMessage> {
+  async sendMessage(
+    conversationId: string,
+    content: string,
+    replyToId?: string,
+    id?: string
+  ): Promise<DirectMessage> {
     const normalizedContent = content.trim();
 
     if (!normalizedContent) {
@@ -232,7 +237,7 @@ export class DirectMessageService {
     }
 
     const message: DirectMessage = {
-      id: uuidv4(),
+      id: id ?? uuidv4(),
       conversationId,
       senderId,
       recipientId,