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/chat/feature/chat-messages/chat-messages.component.ts

@@ -47,6 +47,7 @@ import {
   ChatMessageDeleteEvent,
   ChatMessageEditEvent,
   ChatMessageEmbedRemoveEvent,
+  ChatMessageAttachmentEvent,
   ChatMessageImageContextMenuEvent,
   ChatMessageImageLightboxEvent,
   ChatMessageReactionEvent,
@@ -340,14 +341,17 @@ export class ChatMessagesComponent {
   }
 
   openImageGallery(attachments: Attachment[]): void {
-    const availableImages = attachments.filter((attachment) => attachment.available && attachment.objectUrl);
-
-    if (availableImages.length < 2) {
+    if (attachments.length < 2) {
       return;
     }
 
-    this.attachmentsSvc.pinDisplayBlobs(availableImages);
-    this.galleryAttachments.set(availableImages);
+    const displayableImages = attachments.filter((attachment) => attachment.available && attachment.objectUrl);
+
+    if (displayableImages.length > 0) {
+      this.attachmentsSvc.pinDisplayBlobs(displayableImages);
+    }
+
+    this.galleryAttachments.set(attachments);
   }
 
   closeImageGallery(): void {
@@ -372,6 +376,20 @@ export class ChatMessagesComponent {
     await this.attachmentDownload.downloadToUserLocation(attachment);
   }
 
+  retryGalleryImage(event: ChatMessageAttachmentEvent): void {
+    const { messageId, attachment } = event;
+
+    if ((attachment.receivedBytes ?? 0) > 0 || this.attachmentsSvc.hasPendingRequest(messageId, attachment.id)) {
+      this.attachmentsSvc.cancelRequest(messageId, attachment);
+    }
+
+    void this.attachmentsSvc.requestImageFromAnyPeer(messageId, attachment);
+  }
+
+  cancelGalleryImage(event: ChatMessageAttachmentEvent): void {
+    this.attachmentsSvc.cancelRequest(event.messageId, event.attachment);
+  }
+
   async copyImageToClipboard(attachment: Attachment): Promise<void> {
     this.closeImageContextMenu();