fix(ui): correct Volume modal to use category mixers for proper display

- Use MonitorCatGroup category mixers with AudioInputMusic/AudioInputChat
  names instead of incorrect MasterGroup/MonitorGroup channel mixers
- Add refresh on modal open to fetch fresh data from native client
- Remove FTUESave call that was causing VU meters to stop working
- Export getAudioInputCategoryMixer and getChatCategoryMixer from useMixerHelper

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

jam-ui/src/components/client/JKSessionVolumeModal.js

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useEffect, useState, useCallback } from 'react';
 import {
   Modal,
   ModalHeader,
@@ -7,41 +7,76 @@ import {
 import SessionTrackVU from './SessionTrackVU';
 import SessionTrackGain from './SessionTrackGain'
 import { useMixersContext } from '../../context/MixersContext';
-import { ChannelGroupIds } from '../../helpers/globals.js';
+import { useJamClient } from '../../context/JamClientContext';
+import { MIX_MODES, ChannelGroupIds, CategoryGroupIds } from '../../helpers/globals.js';
 
 const JKSessionVolumeModal = ({ isOpen, toggle }) => {
   const mixerHelper = useMixersContext();
+  const jamClient = useJamClient();
   const mixers = mixerHelper.myTracks[0]?.mixers;
 
-  // Get the real backend mixers for volume controls (like web version)
-  const getMusicMixers = () => {
-    const allMixers = mixerHelper.mixers;
-    const mode = mixerHelper.mixMode;
-    const targetGroupId = mode === true ? ChannelGroupIds.MasterGroup : ChannelGroupIds.MonitorGroup;
+  // Local state for fresh mixer data from native client
+  const [musicMixer, setMusicMixer] = useState(null);
+  const [chatMixer, setChatMixer] = useState(null);
 
-    // Find the real mixer with correct volume values
-    for (const key in allMixers) {
-      if (allMixers[key] && allMixers[key].group_id === targetGroupId) {
-        return allMixers[key]; // Return the real mixer object
-      }
+  // Refresh mixer data from native client when modal opens
+  // This ensures we have the latest values, including changes made in legacy app
+  useEffect(() => {
+    if (isOpen && jamClient) {
+      const refreshMixers = async () => {
+        try {
+          // Get fresh mixer data from native client (PERSONAL mode for monitor output)
+          const freshMixers = await jamClient.SessionGetAllControlState(false);
+
+          // Find music and chat category mixers from fresh data
+          // Category mixers are in MonitorCatGroup (group_id 3) with specific name properties
+          for (const mixer of freshMixers) {
+            if (mixer.group_id === ChannelGroupIds.MonitorCatGroup) {
+              if (mixer.name === CategoryGroupIds.AudioInputMusic) {
+                setMusicMixer(mixer);
+              } else if (mixer.name === CategoryGroupIds.AudioInputChat) {
+                setChatMixer(mixer);
+              }
+            }
+          }
+        } catch (error) {
+          console.warn('Failed to refresh mixer data:', error);
+        }
+      };
+      refreshMixers();
+    }
+  }, [isOpen, jamClient]);
+
+  // Get music category mixer - prefer fresh data from state, fallback to context
+  const getMusicMixers = useCallback(() => {
+    if (musicMixer) {
+      return musicMixer;
+    }
+    // Fallback to context data
+    const categoryMixerResult = mixerHelper.getAudioInputCategoryMixer(MIX_MODES.PERSONAL);
+    if (categoryMixerResult && categoryMixerResult.mixer) {
+      return categoryMixerResult.mixer;
     }
     return null;
-  };
+  }, [musicMixer, mixerHelper]);
 
-  const getChatMixers = () => {
-    const allMixers = mixerHelper.mixers;
-    const targetGroupId = ChannelGroupIds.AudioInputChatGroup;
-
-    // Find the real chat mixer with correct volume values
-    for (const key in allMixers) {
-      if (allMixers[key] && allMixers[key].group_id === targetGroupId) {
-        return allMixers[key]; // Return the real mixer object
-      }
+  // Get chat category mixer - prefer fresh data from state, fallback to context
+  const getChatMixers = useCallback(() => {
+    if (chatMixer) {
+      return chatMixer;
+    }
+    // Fallback to context data
+    const categoryMixerResult = mixerHelper.getChatCategoryMixer(MIX_MODES.PERSONAL);
+    if (categoryMixerResult && categoryMixerResult.mixer) {
+      return categoryMixerResult.mixer;
     }
     return null;
-  };
+  }, [chatMixer, mixerHelper]);
 
   const handleCancel = () => {
+    // Volume changes are applied immediately via setSessionMixerCategoryPlayoutState
+    // when the slider is moved, so no explicit save is needed here.
+    // Note: FTUESave was removed because it was causing VU meters to stop working.
     toggle();
   };
 

jam-ui/src/hooks/useMixerHelper.js

@@ -999,6 +999,9 @@ const useMixerHelper = () => {
     faderChanged,
     initGain,
     setMixerPan,
+    // Category mixer functions for Volume modal
+    getAudioInputCategoryMixer,
+    getChatCategoryMixer,
     // Media arrays from mediaSlice
     backingTracks,
     jamTracks,