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)

distribution/whatsnew/whatsnew-en-US

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+Pezkuwi Wallet - Your gateway to the Pezkuwi blockchain ecosystem.
+
+- Send and receive HEZ tokens
+- Stake HEZ via nomination pools on Asset Hub
+- View your Pezkuwi dashboard with roles and trust score
+- Multi-chain support for Polkadot ecosystem
+- Secure account management with biometric authentication