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/DisplayDriver.h

@@ -41,6 +41,8 @@ public:
   int listVisible()          const { return listVisible(lineStep()); }
   // x where a right-side value column starts (leaves ~8 chars for the value)
   int valCol()               const { return width() - getCharWidth() * 8; }
+  // separator line thickness: 2px on landscape e-ink, 1px on OLED
+  int sepH()                 const { return (width() >= height()) ? 2 : 1; }
   virtual void drawTextCentered(int mid_x, int y, const char* str) {   // helper method (override to optimise)
     int w = getTextWidth(str);
     setCursor(mid_x - w/2, y);
@@ -135,7 +137,7 @@ public:
       case 0x00E7: return 'c'; case 0x00C7: return 'C';  // ç Ç
       case 0x00F1: return 'n'; case 0x00D1: return 'N';  // ñ Ñ
       case 0x00FD: return 'y'; case 0x00DD: return 'Y';  // ý Ý
-      default: return '\xDB';  // CP437 full block █
+      default: return '?';
     }
   }
 

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) {