fix(library): match Watch streams to active owner profile

[papi-ux]

Summary

• hide Watch Stream for foreign-owned paused sessions that have no active owner stream
• derive Watch launch resolution and FPS from the owner’s live capture/encoder status instead of the viewer’s synchronized display preference
• add regression coverage for paused-session eligibility and mismatched owner/viewer stream profiles

Root cause

Nova treated any resumable foreign-owned session as watchable and built the Watch resume mode from client-scoped sync settings. A paused session has no owner stream to join, while a viewer-local mode can differ from the active owner profile and be rejected by Polaris’ strict Watch admission check.

Verification

• ./gradlew --no-daemon testDebugUnitTest
• ./gradlew --no-daemon -PnovaAbis=arm64-v8a assembleNonRoot_gameDebug
• git diff --check
• independent pre-commit review passed after strengthening the profile-mismatch fixture

Device smoke

Verified with two independently paired debug clients: a headless Android emulator as owner and a Retroid Pocket 6 as viewer.

• Retroid Library showed WATCH ACTIVE STREAM with the owner’s live 1920x1080 60fps profile
• Nova sent a Watch resume request with mode=1920x1080x60 and watch=1
• Polaris pinned the viewer to the active owner profile and reported two active sessions
• Retroid rendered live MOUSE: P.I. For Hire video with video/audio startup and no 412, black frame, or error overlay
• both test client sessions were disconnected after the smoke