feat(mixer): install Master Strip Console per spec 47

wiki.md

@@ -836,3 +836,10 @@
 - **Tóm tắt thay đổi:** (1) Tạo `UndoRedoEngine` service (`app/static/js/services/undoRedoEngine.js`) — global stack hỗ trợ cross-cutting state changes (BPM, playhead, selection, AI prompt, instrument). (2) Extend `handleUndo`/`handleRedo` trong `app.jsx` để ưu tiên `UndoRedoEngine`, fallback về track-level undo stack cũ. (3) Áp dụng undo/redo cho: Delete/Create items (section, midi, clip, track), text AI Prompt (native textarea undo stack + engine integration), instrument assignment, playhead position, item drag position, selection changes, BPM/tempo changes. (4) Update undo/redo buttons disabled state + keyboard shortcut indicators. (5) Global Ctrl+Z/Y handler skip INPUT/TEXTAREA focus để text input native undo hoạt động đúng.
 - **Các file ảnh hưởng:** `app/static/js/services/undoRedoEngine.js` (NEW), `app/static/js/app.jsx`
 - **Ghi chú/Test (nếu có):** `npm run build` — build passes.
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+### [2026-07-30 12:37] Task: Install Master Strip Console in mixer panel
+- **Tóm tắt thay đổi:** (1) Thêm CSS styles cho Master Strip Console (`strip-bg`, `fader-track`, `btn-daw`, `btn-teal-active`, `fader-slider`) vào `app/templates/index.html`. (2) Tạo component `MasterStripConsole` trong `app/static/js/app.jsx` — thay thế MASTER strip cũ (fader đơn giản) bằng console theo spec `md/47_MASTER_STRIP_CONSOLE.md`: dual stereo VU meter canvas với dB scales L/R, vertical fader -60~+12dB, button stack (Mono/M/S/Route/FX/Power/Trim/Info), pan knob, dB readout, RMS footer. (3) Tích hợp test signal engine (Play/Stop test audio vào masterBus.input), FX button mở MasteringModal, Power button toggle mastering active/bypass. (4) VU meter animation loop sử dụng `masterBus.leftAnalyser`/`rightAnalyser` thay vì synthetic data.
+- **Các file ảnh hưởng:** `app/templates/index.html`, `app/static/js/app.jsx`
+- **Ghi chú/Test (nếu có):** `npm run build` — build passes (Babel note: deoptimised styling for file >500KB, không phải lỗi).
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