- Undo/Redo in header bar: snapshot-based tracking for block adds, removes,
reorders, parameter changes, and model swaps. 50-level undo stack with
debounced param snapshots (400ms cooldown).
- Main Menu: slide-out sidebar from left with ☰ button in status bar.
Items: Save Preset, Bypass/Control, Global Settings, Global EQ, Tuner,
Wi-Fi / Bluetooth.
- Global Settings: full-screen overlay with grouped settings — Audio (Master
Volume, Input Pad, Impedance), MIDI (Channel, Clock, Thru), Display
(Brightness, Auto Dim, Screen Saver), Tempo (Tap Tempo, Division, Mute).
- Global EQ: 3-band shelving equalizer (Low 80Hz, Mid 800Hz, High 6.4kHz)
with large knobs, canvas-based frequency response graph, and reset button.
- New files: src/MainMenu.jsx, src/GlobalSettings.jsx, src/GlobalEQ.jsx
shawn