fix: harden watch party diagnostics and recovery

[chrisae9]

Summary

Prevent a previous source’s buffering interval from producing a quality recommendation for a new video, and exclude intentional disconnects from connection-failure reports. Normalize Plex identifiers for participant timing and bound health metrics before broadcasting them.

Verification

Lint, production build, and all 536 tests pass (153 server/Node, 383 frontend). Production dependency audit reports zero vulnerabilities. Regression coverage includes source changes during buffering, intentional disconnects, failed room creation, participant timing boundaries, live guest preset updates, malformed diagnostics, and invalid presets.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 8cc4c97 and 2a3234c.

📒 Files selected for processing (10)

• packages/syncloungeserver/src/socketserver/playbackdiagnostics.js
• src/__tests__/participant-health.test.js
• src/__tests__/room-creation-navigation.test.js
• src/__tests__/slplayer-speed-seek.test.js
• src/__tests__/socket-diagnostics.test.js
• src/components/UserList.vue
• src/socket.js
• src/store/modules/slplayer/actions.js
• test/playbackdiagnostics.test.js
• test/socket-validation.test.js

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