fix: Bug - Files lose host on reload

Persist large uploads under app data on publish and restore, and re-announce hosted attachments after reload so peers can download again.

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

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

@@ -2,6 +2,7 @@ import {
   getWatchedAttachmentRoomIdFromUrl,
   isDirectMessageAttachmentRoomId,
   shouldCopyUploaderMediaToAppData,
+  shouldCopyLargeUploaderFileToAppData,
   shouldStreamAttachmentReceiveToDisk,
   canReceiveAttachment
 } from './attachment.logic';
@@ -35,6 +36,16 @@ describe('attachment logic', () => {
     }, '/home/ludde/video.mp4', true)).toBe(true);
   });
 
+  it('copies any oversized upload with a source path into app data', () => {
+    expect(shouldCopyLargeUploaderFileToAppData({
+      size: 628 * 1024 * 1024
+    }, '/home/ludde/setup.exe', true)).toBe(true);
+
+    expect(shouldCopyLargeUploaderFileToAppData({
+      size: 1024
+    }, '/home/ludde/setup.exe', true)).toBe(false);
+  });
+
   it('skips app-data copy for small uploads and missing source paths', () => {
     expect(shouldCopyUploaderMediaToAppData({
       size: 1024,