refactor(ui): upstream's UIColor palette in place of the DARK/LIGHT enum

- DisplayDriver takes ColorVal; each driver's .cpp defines the UIColor roles
  (window_bkg, primary_txt, ...) in its own values. ui-new draws in two:
  window_bkg and primary_txt. OLED and e-ink look as before (sim screens
  pixel-identical).
- E213, E290, LGFX, Null, ST7735, ST7789LCD, U8g2 taken whole from upstream
  (with them the rewritten ST7735 driver and the Heltec V4 R8 TFT display).
- SH1106, SSD1306, ST7789, EinkGfxDisplay and the sim drivers converted.
- ui-orig, ui-tiny, simple_* get upstream's colour roles; the repeater's UI
  taken from upstream (its power-off screen).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/ui-new/TrailScreen.h

@@ -120,7 +120,7 @@ public:
 
   int render(DisplayDriver& display) override {
     display.setTextSize(1);
-    display.setColor(DisplayDriver::LIGHT);
+    display.setColor(UIColor::primary_txt);
 
     // Waypoint management UI owns the screen while active.
     if (_wp.active()) return _wp.render(display);