fix(fc3h): split semicolon-stacked statements (E702) and bridge v-dialog v-model to avoid prop write

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_tasks_backup.py

@@ -30,7 +30,9 @@ def fake_subprocess_and_images_root(monkeypatch, tmp_path):
     )
 
     class _FakeProc:
-        returncode = 0; stdout = b""; stderr = b""
+        returncode = 0
+        stdout = b""
+        stderr = b""
 
     def _fake_run(cmd, **kwargs):
         if cmd[0] == "pg_dump":
@@ -54,7 +56,8 @@ def _seed_backup(db_sync, *, kind, status, started_at, tag=None,
         tar_path="/tmp/fake.tar.zst" if kind == "images" else None,
         manifest={},
     )
-    db_sync.add(row); db_sync.flush()
+    db_sync.add(row)
+    db_sync.flush()
     return row.id