feat(android): release signing + R8-verified signed APK (Phase 28.8)

android/plan.md

@@ -250,28 +250,28 @@ android/
 - [ ] FontAwesome-style icons where they map to the web nav
 - [ ] Page titles (`h3 fw-bold`) at the top of each screen
 
-### 28.8 — Polish + distribution ⬜ NOT STARTED
+### 28.8 — Polish + distribution 🚧 IN PROGRESS
 **Depends on: 28.1–28.7 (whichever subset ships).**
 
-#### 28.8.1 — App polish
-- [ ] App icon (adaptive icon: foreground + background layers)
-- [ ] Splash screen (Android 12+ SplashScreen API)
-- [ ] Dark theme verified on all screens (default, car-friendly)
-- [ ] Error handling audit: every network call has a user-visible error state + retry
-- [ ] Accessibility: content descriptions on icons, reasonable touch targets (≥48dp)
-- [ ] Commit: `feat: app polish`
+#### 28.8.1 — App polish ✅ (2026-08-15)
+- [x] App icon: adaptive icon (red `#e63946` bg + white gauge foreground)
+- [x] Splash screen: native API 31+ (`values-v31/themes.xml`, dark bg + gauge icon)
+- [x] Dark theme follows the OS setting (done in 28.7)
+- [x] App label: "Yaris OBD"
+- [ ] Error handling audit — most screens have error states; dashboard still shows "—" when offline
+- [ ] Accessibility audit — content descriptions present on most icons; touch targets ≥48dp mostly
 
-#### 28.8.2 — Build + distribution
-- [ ] Release build signing key (keystore generated, not committed)
-- [ ] ProGuard/R8 rules verified (Retrofit, OkHttp, Coil, MapLibre keep rules)
-- [ ] APK output: `app/build/outputs/apk/release/app-release.apk`
+#### 28.8.2 — Build + distribution 🚧 (release APK signed; hosting pending)
+- [x] Release signing key: `android/keystore/release.keystore` (gitignored) + `keystore.properties`
+- [x] ProGuard/R8 rules verified — release APK builds AND launches on the Pixel
+- [x] APK output: `app/build/outputs/apk/release/app-release.apk` (~43 MB, signed)
 - [ ] Self-hosted distribution:
   - Copy APK to Pi: `scp app-release.apk [email protected]:~/app/yaris-obd/static/app/`
   - Add a lightweight Pi route: `GET /app` → serves `static/app/index.html` with
     download link + install instructions
   - Phone flow: connect to Pi hotspot → open `http://yaris.local/app` → download APK →
     install (user must enable "Install unknown apps" once)
-- [ ] Commit: `feat: release build + self-hosted distribution`
+- [ ] Commit: `feat: self-hosted distribution`
 
 ## Working notes