Prepare for Play Store release: simplify dashboard, clean debug logs

- Simplify dashboard card: remove referral/staking/perwerde fields (not yet on-chain), keep roles + trust score + action button
- Remove all debug Log.d/e/w calls added during development (PEZ_STAKE, RuntimeFactory, ExtrinsicBuilder, etc.)
- Change Play Store track from beta to production
- Add release notes (whatsnew-en-US)

app/build.gradle

@@ -168,7 +168,7 @@ void createBindReleaseFileTask(String destination) {
 
 play {
     serviceAccountCredentials = file(System.env.CI_PLAY_KEY ?: "../key/fake.json")
-    track = "beta"
+    track = "production"
     releaseStatus = "completed"
 }