refactor(28-02): simplify VU helpers to use external store

- Remove useState from useVuHelpers (no React state for VU data)
- Remove updateVuState, removeVuState, updateVU3 functions
- Remove VuMeterComponent (replaced by direct DOM in SessionTrackVU)
- Expose vuStore methods via return object
- VuContext provides vuStore reference to consumers
- Keep legacy renderVU/updateVU for backward compatibility

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

jam-ui/src/context/VuContext.js

@@ -1,4 +1,5 @@
 import React, { createContext, useContext } from 'react';
+import { vuStore } from '../stores/vuStore';
 import useVuHelpers from '../hooks/useVuHelpers.js';
 
 const VuContext = createContext();
@@ -6,8 +7,14 @@ const VuContext = createContext();
 export const VuProvider = ({ children }) => {
   const vuHelpers = useVuHelpers();
 
+  // Combine vuHelpers with vuStore for context value
+  const value = {
+    ...vuHelpers,
+    vuStore,
+  };
+
   return (
-    <VuContext.Provider value={vuHelpers}>
+    <VuContext.Provider value={value}>
       {children}
     </VuContext.Provider>
   );

jam-ui/src/hooks/useVuHelpers.js

@@ -1,9 +1,9 @@
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { useCallback } from 'react';
+import { vuStore } from '../stores/vuStore';
 
 const logger = console;
 
 export default function useVuHelpers() {
-  const [vuStates, setVuStates] = useState({});
 
   const createQualifiedId = useCallback(mixer => {
     return (mixer.mode ? 'M' : 'P') + mixer.id;
@@ -93,103 +93,15 @@ export default function useVuHelpers() {
     }
   }, []);
 
-
-
-  // New React-like VU update function
-  const updateVuState = useCallback((mixerId, level, clipping = false) => {
-    setVuStates(prev => ({
-      ...prev,
-      [mixerId]: { level, clipping }
-    }));
-  }, []);
-
-  const removeVuState = useCallback((mixerId) => {
-    setVuStates(prev => {
-      const newState = { ...prev };
-      delete newState[mixerId];
-      return newState;
-    });
-  }, []);
-
-  const updateVU3 = useCallback(
-    (mixer, leftValue, leftClipping, rightValue, rightClipping) => {
-      const fqId = createQualifiedId(mixer);
-      //logger.debug('useVuHelpers: updateVU3', { fqId, mixer, leftValue, rightValue });
-
-      // Update React state for declarative rendering
-      updateVuState(fqId, leftValue, leftClipping);
-    },
-    [createQualifiedId, updateVuState]
-  );
-
-  useEffect(() => {
-    return () => {
-      // Cleanup on unmount
-      setVuStates({});
-    };
-  }, []);
-
-  // Create a proper React component that can be used outside the hook
-  function VuMeterComponent({ mixerId, orientation = 'vertical', lightCount = 16, lightWidth = 15, lightHeight = 10 }) {
-    const vuState = vuStates[mixerId] || { level: 0, clipping: false };
-    const { level, clipping } = vuState;
-
-    const lights = [];
-    for (let i = 0; i < lightCount; i++) {
-      // Calculate if this light should be on based on the level
-      const lightThreshold = (lightCount - i) / lightCount;
-      const isOn = level >= lightThreshold;
-
-      let bgClass = 'vu-bg-secondary'; // Default off state
-      if (isOn) {
-        if (clipping) {
-          bgClass = 'vu-bg-danger'; // Red for clipping
-        } else {
-          const positionFromBottom = lightCount - 1 - i;
-          if (positionFromBottom >= Math.floor(lightCount * 0.75)) { // Red zone (top 25%)
-            bgClass = 'vu-bg-danger';
-          } else if (positionFromBottom >= Math.floor(lightCount * 0.5)) { // Yellow zone (middle 25%)
-            bgClass = 'vu-bg-warning';
-          } else { // Green zone (bottom 50%)
-            bgClass = 'vu-bg-success';
-          }
-        }
-      }
-
-      lights.push(
-        <div
-          key={i}
-          className={bgClass}
-          style={{
-            height: `${lightHeight}px`,
-            width: `25px`,
-            marginTop: '1px',
-            borderRadius: '2px',
-            border: '1px solid #eee'
-          }}
-        />
-      );
-    }
-
-    return (
-      <div className='vu'>
-        <div className="d-flex flex-column" style={{ height: `${lightCount * (lightHeight + 1)}px` }}>
-          {lights}
-        </div>
-      </div>
-    );
-  }
-
   return {
-    // React-like components and functions
-    VuMeter: VuMeterComponent,
-    updateVuState,
-    removeVuState,
-    vuStates,
+    // External store methods (new)
+    updateVuState: vuStore.updateLevel,
+    removeVuState: vuStore.removeLevel,
+    vuStore, // Expose full store for advanced usage
 
     // Legacy functions for backward compatibility
+    createQualifiedId,
     renderVU,
     updateVU,
-    updateVU3
   };
 }