fix: landscape e-ink layout corrections — clock overlap, keyboard overflow, bar sizing, nearby detail

- GxEPDDisplay: fontAscender only applies to sz=1 with Lemon; sz=2 (NULL font)
  was incorrectly getting a 16px cursor offset, causing clock text to render
  16px lower than expected and overlap the date line
- KeyboardWidget: compute cell_h from available screen height instead of lh+1;
  tighten sep_y to lh so the grid fits within 122px even with Lemon font (lh=20)
- SettingsScreen renderBar: constrain box size to available width so the 5th
  buzzer-volume square doesn't overflow past the right edge with Lemon font
- NearbyScreen discover detail: manually truncate b64 public key by charWidth
  to guarantee one-line rendering; use dynamic step = (height-hdr)/5 so
  Status line doesn't fall off the bottom of the screen
- NearbyScreen contacts detail: merge dist+az into one line and use dynamic
  step to fit 5 lines within the display; removes the off-screen Seen: row
- AutoAdvertScreen: replace lineStep() gap before hints with 4px fixed gap
  so both hint lines fit within the display with large fonts

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

examples/companion_radio/ui-new/SettingsScreen.h

@@ -87,9 +87,12 @@ class SettingsScreen : public UIScreen {
   }
 
   void renderBar(DisplayDriver& display, int x, int y, int value, int max_val) {
-    const int box_h = display.getLineHeight() - 2;
-    const int box_w = box_h;
-    const int gap   = 2;
+    const int gap     = 2;
+    const int avail   = display.width() - x;
+    const int raw     = (avail - (max_val - 1) * gap) / max_val;
+    const int cap     = display.getLineHeight() - 2;
+    const int box_h   = raw < cap ? (raw < 2 ? 2 : raw) : cap;
+    const int box_w   = box_h;
     for (int i = 0; i < max_val; i++) {
       int bx = x + i * (box_w + gap);
       display.drawRect(bx, y, box_w, box_h);