App 2.35.2: a round full-screen button; THEMES.md with every Overview style

The full-screen button's disc was an oval (an even inset in a 64 x 72 dp
area); the area is now a square 72 dp, pulled into the panel's padding
so the logo keeps its line. THEMES.md shows the twelve Overview styles,
each with and without the navigation (emulator, sample values), with
what inspired each; linked from README.md and AGENTS.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

SPECS.md

@@ -138,6 +138,14 @@ tyre pressures, GPS (lat, lon, elevation, heading) and the is_* flags. It does *
   confirmed car facts, app structure, UI conventions, build/test/ship, documents. It replaces
   upstream's EVABRPUploader text. The test emulator is now in the flake: `nix run .#car-emulator`
   (Android 9 AOSP at 1920×720, 160 dpi; the car build installs as the system user — checked).
+- 2026-10-25 — App 2.35.2: the full-screen button is round. Its disc was an even inset in a
+  64 × 72 dp (narrow: 64 × 76) area, so an oval; the area is now a square 72 × 72 dp (inset
+  18 dp, a 36 dp disc), pulled 8 dp into the panel's padding in the wide layout so "MG4" keeps
+  its line. **THEMES.md**: the twelve Overview styles, each with and without the navigation
+  (`screenshots/themes/`, 1920 × 720 from the emulator with sample values from a throwaway build,
+  never committed), with what inspired each and how it takes colour; linked from README.md
+  (Screenshots, Contents, Project documents) and AGENTS.md. Emulator: the round button, the
+  header with "MG4" on one line. Not tried on the car.
 - 2026-10-25 — App 2.35.1: **Aviation removed** (owner's choice: `AviationView`, its palette and
   string; a stored "AVIATION" opens Tiles). The Sci-fi palette for the app is now the lilac of
   the console frame's lower elbow (`scifi_lilac` #CC99CC) instead of the orange of the upper one.