feat(l1): L2 splash, hovering Home icons, soft selections, two-line DM bubbles

- Splash: the L2 wordmark and lettering, shared through ui-core/Lettering.h,
  rise in with loading dots under the version line (static frame on e-ink).
- Home: the header shows the time once the clock is set; icon pages carry
  only their title. One 32 px icon family (3 px strokes) bobs 2 px over a
  dithered blob shadow that shrinks as it rises; the unread badge rides on
  the Messages bubble; Bluetooth off is the icon at half density.
- Soft corners on every selection, the page pill, tabs and popups;
  dotted scrollbar track with a rounded thumb; the tab bar lays out whole
  tabs and shows edge arrows only in free space.
- DM bubbles drop the sender row and wrap to a second line, with the
  delivery mark and age closing it.
- Keyboards name what is typed (channel, contact, Password, Scope...)
  and show characters left near the limit; PIN entry has its own preview.
- Loading dots for waits (login, scan, GPS) and signal bars in place of
  raw RSSI in Nearby.

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

src/helpers/ui/DisplayDriver.h

@@ -188,7 +188,8 @@ public:
   void drawSelectionRow(int x, int y, int w, int h, bool sel) {
     setColor(LIGHT);
     if (sel) {
-      fillRect(x, y, w, h);
+      if (w > 2 && h > 2) fillSoftRect(x, y, w, h);   // soft corners, like every box
+      else fillRect(x, y, w, h);
       setColor(DARK);
     }
   }