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Frank Stellmacher
6e646351ee
Adds 22 new tests on top of the existing 7 _on* / stopPreview ones. startPreview happy path: invokes audio_preview_play with the configured args (id, url, durationSec, startSec, volume) and stores the previewing track + duration + reset elapsed / audioStarted. Short tracks (duration <= previewDuration * 1.5) start at 0; longer tracks seek to duration * trackPreviewStartRatio. Camel-case IPC keys pinned (startSec / durationSec, not snake_case -- CLAUDE.md gotcha). Cross-store guard tests: no-op when previews globally disabled, no-op when disabled at the calling location, no-op while a host or guest is inside any Orbit phase (active / joining / starting), falls through to play when role is null (no session). Same-id re-click: treats it as a stop -- audio_preview_stop fires, audio_preview_play does not. Failure path: engine invoke rejects -> store state rolls back (previewingId / previewingTrack / audioStarted) and the error propagates to the caller. Loudness pre-attenuation folding: with normalizationEngine=loudness + loudnessPreAnalysisAttenuationDb=-6 dB, volume is multiplied by 10^(-6/20). normalizationEngine=off keeps volume verbatim. Positive pre-attenuation values are pulled to 0 by the Math.min(0, ...) guard. Main-player volume sync side-effect (module-level usePlayerStore.subscribe): pings audio_preview_set_volume when volume changes during a preview, skips when no preview is active, skips when the new value equals the prior value (subscription guard). previewStore.ts coverage 33% -> 100% lines. Added to the hot-path gate. Plus the typed `OrbitRole` is `'host' | 'guest'` (null when no session), not 'idle' as a string -- minor type-correctness alignment.