fix(titles): normalize titles at stub insert too (RSS/backfill/live-search)

_insert_stubs previously stored the raw title, so a brand-new video showed its unnormalized
title until enrichment caught up. Normalize (and stash original_title) at insert as well, so
every video-title write path is covered: stub insert, enrichment, live search, and the download
worker. Every newly imported feed video is normalized from the first insert.

backend/app/sync/videos.py

@@ -54,6 +54,11 @@ def _insert_stubs(db: Session, rows: list[dict]) -> int:
         return 0
     seen: dict[str, dict] = {}
     for row in rows:
+        # Normalize the title at first insert too (RSS/backfill stubs), so a brand-new video
+        # never flashes its raw title before enrichment refreshes it.
+        raw = row.get("title")
+        if raw:
+            row = {**row, "original_title": raw, "title": normalize_title(raw)}
         seen[row["id"]] = row
     stmt = (
         pg_insert(Video)