GBC sound (T-Deck Max), mesh stays live in-game, fast waveform at 12 frames, wrap fix

SOUND (Max, ES8311; Pro stays silent)
- minigb_apu vendored from Meck-P4 (MIT), run at 22050 Hz: at 44100 it
  cost 3.6-4.0 ms of the 16.7 ms frame and the game fell to 0.98x, which
  drained the DMA queue and glitched. Per-frame timings (core / apu /
  i2s wait) now print with the speed line.
- Bring-up reuses the notification-tone path: shared Audio object owns
  I2S port 0 (with MCLK), XL9555 routing and amp, then codec init after
  the clocks are running. Raw PCM written per frame; a repeated sample
  every sixth frame keeps production a hair above the DAC so its clock
  paces the game instead of the queue running dry.
- Software gain 1/8 (codec DAC sits at 0 dB); GBC_AUDIO_SHIFT to tune.
- 950 ms delay line (PSRAM) so sound lands with the picture, which
  reaches the glass ~1 s after its frame; GBC_AUDIO_DELAY_MS to tune.
- Games start muted; mic key toggles the codec mute in both keyboard
  drivers' raw mode; footer shows the current hint. Amp off on quit.
- Notification tones skipped while a game runs (game owns the codec).

MESH LIVE DURING PLAY
- The OTA-style radio pause is gone (GBC_PAUSE_RADIO=1 restores it):
  the mesh runs on the other core and already tolerates the panel
  blocking the loop. Game header now matches the home screen's -- the
  cumulative unread channel count where the node name goes, clock,
  battery percent. "New:" toasts suppressed only while a ROM is running
  (Snake and Minesweeper keep them).

DISPLAY
- Fast register waveform set to 12 frames per push (FAST_LUT_FRAMES):
  judged the best balance of UI speed and contrast. Interface only; the
  game keeps the factory waveform.
- Windowed game refresh dropped: measured to save nothing, and it left
  the footer row unrefreshed. Normal partial refresh, change-detected.
- Adafruit GFX auto-wrap turned off in the e-ink driver (all e-ink
  builds): it dropped a glyph onto the next line's margin when a line
  ran a few pixels past the edge (seen with Larger Noto in compose).
  Compose wrap width also allows for the driver's 2-unit x offset.
- Game start does one full refresh (tried as a ghosting fix; NPC
  ghosting in Pokemon Gold is the game + dither + factory partial
  waveform and shows on the stock build too).

Files: examples/companion_radio/{main.cpp, ui-new/GBCEmulatorScreen.{h,cpp},
ui-new/UITask.cpp, ui-new/minigb_apu.{c,h}}, src/helpers/ui/GxEPDDisplay.cpp,
src/helpers/ui/GxEPD2_310_GDEQ031T10_FAST.cpp,
variants/lilygo_tdeck_{max,pro}/TCA8418Keyboard.h

variants/lilygo_tdeck_max/TCA8418Keyboard.h

@@ -53,6 +53,7 @@ private:
   bool             _rawJoypad;
   volatile uint8_t _rawMask;      // Peanut-GB direct.joypad bit layout, set = held
   volatile bool    _rawExit;      // Q or Shift+Backspace press-edge latch
+  volatile bool    _rawMute;      // Mic key press-edge latch (game sound mute toggle)
   bool             _rawShiftL;    // left Shift (35) physically held
   bool             _rawShiftR;    // right Shift (31) physically held
 
@@ -73,6 +74,10 @@ private:
       if (pressed) _rawExit = true;
       return 0;
     }
+    if (keyCode == 34) {                       // Mic = mute toggle
+      if (pressed) _rawMute = true;
+      return 0;
+    }
     if (keyCode == 11) {                       // Backspace: Shift+Backspace = quit
       if (pressed && (_rawShiftL || _rawShiftR)) _rawExit = true;
       return 0;
@@ -211,7 +216,7 @@ public:
     : _addr(addr), _wire(wire), _initialized(false), 
       _shiftActive(false), _shiftConsumed(false), _shiftHeld(false), _leftShiftHeld(false), _rightShiftHeld(false), _shiftUsedWhileHeld(false), _altActive(false), _symActive(false), _micHeld(false), _lastShiftTime(0),
       _enterHeld(false), _enterPressTime(0),
-      _rawJoypad(false), _rawMask(0), _rawExit(false), _rawShiftL(false), _rawShiftR(false) {}
+      _rawJoypad(false), _rawMask(0), _rawExit(false), _rawMute(false), _rawShiftL(false), _rawShiftR(false) {}
 
   bool begin() {
     // Check if device responds
@@ -461,6 +466,7 @@ public:
     _rawJoypad = on;
     _rawMask = 0;
     _rawExit = false;
+    _rawMute = false;
     _rawShiftL = _rawShiftR = false;
     _shiftActive = _shiftHeld = _leftShiftHeld = _rightShiftHeld = false;
     _shiftUsedWhileHeld = _shiftConsumed = false;
@@ -475,6 +481,12 @@ public:
     _rawExit = false;
     return e;
   }
+  // Mic key press-edge latch, consumed on read.
+  bool rawMutePressed() {
+    bool m = _rawMute;
+    _rawMute = false;
+    return m;
+  }
   bool isMicHeld() const { return _micHeld; }
   
   // Check if shift was pressed within the last N milliseconds

variants/lilygo_tdeck_pro/TCA8418Keyboard.h

@@ -49,6 +49,7 @@ private:
   bool             _rawJoypad;
   volatile uint8_t _rawMask;      // Peanut-GB direct.joypad bit layout, set = held
   volatile bool    _rawExit;      // Q or Shift+Backspace press-edge latch
+  volatile bool    _rawMute;      // Mic key press-edge latch (game sound mute toggle)
   bool             _rawShiftL;    // left Shift (35) physically held
   bool             _rawShiftR;    // right Shift (31) physically held
 
@@ -66,6 +67,10 @@ private:
       if (pressed) _rawExit = true;
       return;
     }
+    if (keyCode == 34) {                       // Mic = mute toggle
+      if (pressed) _rawMute = true;
+      return;
+    }
     if (keyCode == 11) {                       // Backspace: Shift+Backspace = quit
       if (pressed && (_rawShiftL || _rawShiftR)) _rawExit = true;
       return;
@@ -203,7 +208,7 @@ public:
     : _addr(addr), _wire(wire), _initialized(false), 
       _shiftActive(false), _shiftConsumed(false), _shiftHeld(false), _shiftUsedWhileHeld(false), _altActive(false), _symActive(false), _micHeld(false), _lastShiftTime(0),
       _enterHeld(false), _enterPressTime(0),
-      _rawJoypad(false), _rawMask(0), _rawExit(false), _rawShiftL(false), _rawShiftR(false) {}
+      _rawJoypad(false), _rawMask(0), _rawExit(false), _rawMute(false), _rawShiftL(false), _rawShiftR(false) {}
 
   bool begin() {
     // Check if device responds
@@ -431,6 +436,7 @@ public:
     _rawJoypad = on;
     _rawMask = 0;
     _rawExit = false;
+    _rawMute = false;
     _rawShiftL = _rawShiftR = false;
     _shiftActive = _shiftHeld = false;
     _shiftUsedWhileHeld = _shiftConsumed = false;
@@ -445,6 +451,12 @@ public:
     _rawExit = false;
     return e;
   }
+  // Mic key press-edge latch, consumed on read.
+  bool rawMutePressed() {
+    bool m = _rawMute;
+    _rawMute = false;
+    return m;
+  }
   bool isMicHeld() const { return _micHeld; }
   
   // Check if shift was pressed within the last N milliseconds