fix: Bug - Sending files and attachment issues (cross-transport auto-download race)

Re-queue attachment auto-downloads when the chat message arrives, since
file-announce (WebRTC) can beat chat-message (websocket) and the announce-time
pass gives up on an unknown room. Gate stalled-download resets on chunk-progress
staleness so an active transfer is never cancelled mid-stream, which deadlocked
the retry against the sender's active-transfer dedupe.

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

toju-app/src/app/domains/attachment/application/services/attachment-manager.service.ts

@@ -382,7 +382,8 @@ export class AttachmentManagerService {
 
       if (shouldResetStalledAttachmentDownload(
         attachment,
-        this.transfer.hasPendingRequest(messageId, attachment.id)
+        this.transfer.hasPendingRequest(messageId, attachment.id),
+        Date.now()
       )) {
         this.transfer.cancelRequest(messageId, attachment);
       } else if ((attachment.receivedBytes ?? 0) > 0) {