HNS Browser v0.2.0

Release v0.2.0.\n\nChanges:\n- Prepares the app for Google Play tester submission with an upload-signed AAB, privacy materials, and Play readiness documentation.\n- Hardens release builds with upload-signing checks, minification/resource shrinking, backup exclusions, and cleartext blocked except loopback.\n- Adds in-app privacy policy access and hosted Denuo Web privacy pages.\n- Updates Android/Rust version metadata and browser User-Agent strings to 0.2.0.\n\nArtifacts:\n- Play upload-signed Android App Bundle (.aab) for Play Console testing tracks.\n- Universal Android APK signed with the Play upload key for direct QA installs.\n- SHA256 checksums for both binary artifacts.\n- Play Console icon and feature graphic assets.