fix: address reader-UI feedback (shorts, search, tags, login, UX)

- Shorts: confirm via youtube.com/shorts/<id> probe (SOCS cookie bypasses the
  consent redirect) instead of a 60s heuristic; concurrent probing, shorts_probed
  flag, scheduled refinement (migration 0005)
- Search: match title + channel name only (descriptions caused noisy results)
- Faceted tag filtering: AND across categories (language AND topic narrows),
  OR within a category; any/all toggle applies to topics
- Language detection: majority vote over individual titles (fixes misdetections
  like multipoleguy -> English; drops bogus Polish/Romanian)
- Login: drop forced consent so returning sign-in is quick (select_account)
- Feed cards: clickable channel name (opens channel), persistent saved badge,
  undo toast on hide, Hidden view to restore; tag chips show counts in tooltip

backend/app/sync/runner.py

@@ -15,6 +15,7 @@ from app.sync.videos import (
     backfill_channel_recent,
     enrich_pending,
     poll_rss_channel,
+    run_shorts_classification,
 )
 from app.youtube.client import YouTubeClient
 
@@ -60,6 +61,10 @@ def run_enrich(db: Session, max_batches: int = 200, floor: int = 200) -> int:
     return total
 
 
+def run_shorts(db: Session) -> dict:
+    return run_shorts_classification(db)
+
+
 def run_recent_backfill(
     db: Session, channels: list[Channel] | None = None, max_channels: int | None = None
 ) -> dict: