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* feat(web): add opt-in notification sound for waiting-for-input Play a configurable per-device sound when a session starts waiting for user input. Sounds are synthesized with the Web Audio API (no binary assets), follow the same suppression rules as desktop notifications, and work independently of the browser Notification permission. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * fix(web): drop stale sound plays when AudioContext resume is delayed Scheduling notes on a suspended context queued every pending alert and played them stacked once the user finally interacted. Schedule only after resume() fulfills and drop plays older than 2s. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * fix(web): harden notification sound playback edge cases Catch AudioContext construction failures so a broken audio stack cannot abort the WS handler before the desktop notification is shown, route interrupted (iOS) contexts through the resume path, and coalesce plays queued while the context is not running so only one pending cue fires. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * fix(web): make sound test stubs constructible and refine resume queue vi.fn with an arrow implementation is not constructible, so the AudioContext stubs silently misbehaved on CI's Node runtime. Also keep the newest pending play instead of dropping later requests, recheck the preference before a resumed waiting-for-input cue fires, and validate picker values with the existing type guard. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Kandev Agent <agent@kandev.dev> Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>