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/static/audio.js

@@ -83,10 +83,7 @@
       lastBeatConsoleKey = key;
       if (!line) return;
       const seq = /** @type {Record<string, unknown>|undefined} */ (status && status.sequence);
-      const seqBeats =
-        !!seq &&
-        !!seq.active &&
-        String(seq.advance_mode || "").toLowerCase() === "beats";
+      const seqBeats = !!seq && !!seq.active;
       let out = line;
       if (seqBeats) {
         const nLanes = Number(seq && seq.num_lanes);
@@ -122,7 +119,6 @@
   function formatSequenceBeatFractionsForLog(status) {
     const seq = /** @type {Record<string, unknown>|undefined} */ (status && status.sequence);
     if (!seq || !seq.active) return null;
-    if (seq.advance_mode !== "beats") return null;
 
     const laneBeatAt = Number(seq.lane0_beat_in_step);
     const laneBeatsPerStep = Number(seq.lane0_beats_per_step);