feat(zones): profile-scoped groups, zone modes, sequence brightness

- Optional profile_id on groups; UI and API for shared vs profile-only groups\n- Zone content_kind (presets vs sequences); edit modal shows matching sections; devices via groups only\n- Server sequence playback folds zone brightness into preset wire b (per MAC where needed)\n- Related preset/sequence/audio/beat-route and client updates

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

src/controllers/sequence.py

@@ -197,7 +197,7 @@ async def play_sequence(request, session, id):
     try:
         from util.sequence_playback import start
 
-        await start(zone_id, str(id), str(current_profile_id))
+        await start(zone_id, str(id), str(current_profile_id), data if isinstance(data, dict) else None)
         return json.dumps({"ok": True}), 200, {"Content-Type": "application/json"}
     except ValueError as e:
         return json.dumps({"error": str(e)}), 400, {"Content-Type": "application/json"}