fix(weather): keep met-weather DTOs from R8 so Gson works; add +4h reading (v0.3.8)

- ProGuard keep rule for dk.haugesenspil.metweather.** (R8 was obfuscating the
  Gson DTOs -> ClassCastException, weather glyph vanished).
- Home current-weather now shows 'current  ->  ~4h' (nearest MET hourly point),
  cached in met_weather_prefs.
release build v0.3.8

CLAUDE.md

@@ -38,7 +38,7 @@ export JAVA_HOME=~/jdk21        # Gradle 8.13, compileSdk/targetSdk 36, minSdk 2
 ## Release flow (see git history for the v0.3.x pattern)
 
 1. Bump `versionCode`/`versionName` in `app/build.gradle.kts`
-   (currently 37 / 0.3.7).
+   (currently 38 / 0.3.8).
 2. Build both flavors, then sign each:
 
 ```bash
@@ -46,9 +46,9 @@ PASS=$(cat ~/android-keystores/easylauncher-release.pass)
 ~/android-sdk/build-tools/36.0.0/apksigner sign --v4-signing-enabled true \
   --ks ~/android-keystores/easylauncher-release.jks --ks-key-alias easylauncher \
   --ks-pass "pass:$PASS" --key-pass "pass:$PASS" \
-  --out dist/EasyLauncher-Internet-v0.3.7-Signed.apk \
+  --out dist/EasyLauncher-Internet-v0.3.8-Signed.apk \
   app/build/outputs/apk/withInternet/release/app.easy.launcher_v0.3.7-Release.apk
-# repeat for withoutInternet -> dist/EasyLauncher-v0.3.7-Signed.apk
+# repeat for withoutInternet -> dist/EasyLauncher-v0.3.8-Signed.apk
 ```
 
 3. `apksigner verify --print-certs` should show the keystore SHA-256.