Show vibe text on playlist items in dashboard

The vibe is the core concept of vibe-aware playlists but wasn't
visible anywhere on the dashboard. Now each recent playlist shows
its vibe text alongside track count and age.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/haunt_fm/api/status_page.py

@@ -228,6 +228,7 @@ async def status_page(request: Request, session: AsyncSession = Depends(get_sess
             "name": p.name or f"Playlist #{p.id}",
             "tracks": p.total_tracks,
             "known_pct": p.known_pct,
+            "vibe": p.vibe,
             "created_at": p.created_at,
         }
         for p in playlist_rows