fix(ui): preserve virtual display and CUDA path state

[papi-ux]

Summary

• Preserve Polaris game virtual-display recommendations when client settings have no desired/effective display mode instead of silently falling back to headless.
• Normalize host_virtual_display / virtual_display aliases in the Polaris sync UI so the canonical Host Virtual Display row shows selected/disabled state correctly.
• Treat session encoder target_device=cuda as GPU-path truth when target_residency is omitted, keeping HUD path copy from looking like CUDA disappeared.

Test Plan

• RED: targeted regression tests failed before the production fix:
  • virtualRecommendationWinsWhenClientSettingsHaveNoDisplayMode
  • normalizedVirtualDisplayModeSelectsAndDisablesCanonicalRow
  • parseSessionStatus_cudaTargetDeviceImpliesGpuPathWhenResidencyMissing
  • cudaTargetDeviceKeepsGpuPathInStreamModeLabelWhenResidencyMissing
• PASS: ./gradlew -PnovaAbis=x86_64 :app:testNonRoot_gameDebugUnitTest --tests com.papi.nova.ui.NovaGameDetailUiStateTest --tests com.papi.nova.ui.NovaPolarisSyncUiStateTest --tests com.papi.nova.api.PolarisApiClientParsingTest --tests com.papi.nova.ui.NovaHudUiStateTest
• PASS: ./gradlew -PnovaAbis=x86_64 :app:testNonRoot_gameDebugUnitTest
• PASS: ./gradlew -PnovaAbis=x86_64 -PlintFailOnError=true :app:lintNonRoot_gameDebug
• PASS after submodule init: git submodule update --init --recursive app/src/main/jni/moonlight-core/moonlight-common-c; ./gradlew :app:assembleNonRoot_gameDebug :app:assembleRootDebug -PnovaAbis=arm64-v8a
• PASS: git diff --check origin/master...HEAD
• Device state only, no install/stream/deploy: adb saw 98ea526f, Retroid Pocket 6, Android 13.

Scope guard

• Android API/UI/test files only.
• No Deck/docs/spikes paths changed.
• No release, deploy, merge, or stream smoke performed.