refactor(28-02): route VU data to external store

- Import vuStore in useMixerStore.js
- Replace mixerHelper.updateVU call with vuStore.updateLevel
- VU data now flows to external store instead of React state
- Native bridge still calls at 50-70/sec but updates are buffered

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

jam-ui/src/hooks/useMixerStore.js

@@ -13,6 +13,7 @@ import { putTrackSyncChange } from '../helpers/rest';
 import useVuHelpers from './useVuHelpers';
 import { useJamServerContext } from '../context/JamServerContext';
 import { useMixersContext } from '../context/MixersContext';
+import { vuStore } from '../stores/vuStore';
 
 
 
@@ -169,21 +170,15 @@ export default function useMixerStore() {
         // TODO - no guarantee range will be -80 to 20. Get from the
         // GetControlState for this mixer which returns min/max
         // value is a DB value from -80 to 20. Convert to float from 0.0-1.0
-        //console.log('handleBridgeCallback@mixers',@mixers)
 
-        // Use ref to get current mixerHelper (fixes stale closure issue)
-        const currentMixerHelper = mixerHelperRef.current;
+        // Convert dB to 0.0-1.0 range (existing logic)
+        const normalizedLevel = (leftValue + 80) / 80;
 
-        if (currentMixerHelper?.isReady.current) {
-          currentMixerHelper.updateVU(
-            mixerId,
-            mode,
-            (leftValue + 80) / 80,
-            leftClipping,
-            (rightValue + 80) / 80,
-            rightClipping
-          );
-        }
+        // Create qualified ID matching existing pattern
+        const fqId = (mode ? 'M' : 'P') + mixerId;
+
+        // Route to external store instead of mixerHelper
+        vuStore.updateLevel(fqId, normalizedLevel, leftClipping);
       }
     }