fix: e-ink portrait/landscape layout — separators, battery, keyboard, screens

- DisplayDriver: add sepH() (2px landscape, 1px OLED); fix transliterateCodepoint
  fallback '?' (was '\xDB' which broke UTF-8 word-wrap and rendered tiny block char)
- GxEPDDisplay: drawRect draws double border on landscape for visible 2px weight
- UITask: navigation dots scale with lh; content_y saves 16px by using dots_y+6;
  battery iconW=lh*2, fill margin bm scales with orientation; indicator spacing fixed;
  clock separator uses sepH(); alert popup tight and vertically centred
- KeyboardWidget: compact cell height (no stretch), multi-line preview, cursor always
  on last visible line
- BotScreen / NearbyScreen detail: use lineStep() as natural item height, shrink only
  when items don't fit (fixes portrait stretch)
- QuickMsgScreen: send button pinned to display bottom (height-lh-2), not floating
- SettingsScreen: AUTO_OFF guarded with #if AUTO_OFF_MILLIS>0; default sel=AUTO_LOCK
- All screens: separators updated to sepH()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/helpers/ui/GxEPDDisplay.cpp

@@ -139,6 +139,8 @@ void GxEPDDisplay::drawRect(int x, int y, int w, int h) {
   display_crc.update<int>(w);
   display_crc.update<int>(h);
   display.drawRect(x, y, w, h, _curr_color);
+  if (width() >= height() && w > 2 && h > 2)
+    display.drawRect(x + 1, y + 1, w - 2, h - 2, _curr_color);
 }
 
 void GxEPDDisplay::drawXbm(int x, int y, const uint8_t* bits, int w, int h) {