v4.4.3 BA7OPF Feature Build 8

What's Changed

• Fix frequency calculator state reset when scrolling down to the CW decoder and back.
  • Calculator TX/RX/passband mode and frequency state are now saved with rememberSaveable per selected transponder.
  • The calculator LazyColumn item now has a stable key, so off-screen lazy item disposal no longer resets the current frequency to passband center.

Verification

• ./gradlew :feature:radar:compileDebugKotlin --no-daemon ✅
• ./gradlew :app:assembleRelease --no-daemon ✅
• apksigner verify --verbose ✅ v2 signature verified
• Native ABI check ✅ only lib/armeabi-v7a/ .so files are packaged