Phase 31 selector optimization and Phase 32 state update changes
caused VU meters to animate slowly and volume sliders to be
unresponsive. Reverted all affected files to pre-Phase-31 state.
Files reverted:
- useMixerHelper.js: back to individual selectors (no shallowEqual)
- mixersSlice.js: removed composed selectors
- JKSessionScreen.js: pre-Phase-32 state
- useSessionModel.js: pre-Phase-32 debounce changes
Performance issues resolved:
- VU meter animations now smooth
- Volume sliders respond immediately
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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