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/models/sequence.py

@@ -54,9 +54,19 @@ class Sequence(Model):
             if "group_ids" not in doc or not isinstance(doc.get("group_ids"), list):
                 doc["group_ids"] = []
                 changed = True
-            if doc.get("advance_mode") not in ("time", "beats"):
-                doc["advance_mode"] = "time"
+            if doc.get("advance_mode") != "beats":
+                doc["advance_mode"] = "beats"
                 changed = True
+            if "simulated_bpm" not in doc:
+                doc["simulated_bpm"] = 120
+                changed = True
+            else:
+                try:
+                    sb = int(float(doc["simulated_bpm"]))
+                    doc["simulated_bpm"] = max(30, min(300, sb))
+                except (TypeError, ValueError):
+                    doc["simulated_bpm"] = 120
+                    changed = True
             if "sequence_transition" not in doc:
                 doc["sequence_transition"] = 500
                 changed = True
@@ -102,9 +112,10 @@ class Sequence(Model):
             "group_ids": [],
             "lanes": [[]],
             "lanes_group_ids": [[]],
-            "advance_mode": "time",
+            "advance_mode": "beats",
             "steps": [],
             "step_duration_ms": 3000,
+            "simulated_bpm": 120,
             "sequence_transition": 500,
             "loop": True,
         }