feat(zones): persist per-zone brightness and update submodules

Store zone brightness in model/data flow, apply it in the zones UI, and record updated led-driver, led-simulator, and led-tool submodule pointers.

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

src/models/wifi_ws_clients.py

@@ -124,15 +124,6 @@ def _register_ws(ip: str, ws) -> None:
         _send_locks[key] = asyncio.Lock()
     _schedule_status_broadcast(key, True)
     print(f"[WS] driver connected {key!r}")
-    try:
-        loop = asyncio.get_running_loop()
-    except RuntimeError:
-        return
-
-    async def _apply_saved_brightness():
-        await sync_global_brightness_to_driver(key)
-
-    loop.create_task(_apply_saved_brightness())
 
 
 def unregister_tcp_writer(peer_ip: str, ws=None) -> str:

src/models/zone.py

@@ -34,6 +34,7 @@ class Zone(Model):
             "names": names if names else [],
             "presets": presets if presets else [],
             "default_preset": None,
+            "brightness": 255,
         }
         self.save()
         return next_id