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feat: recover screen-share on silent track death (detect, retry, Sentry report) (#564)

* feat: recover screen-share on silent track death (detect, retry, Sentry report)

DCL Cast presenters lost their screen share ~2-3 min in (silent LiveKit
track death): the screen vanished, the button stuck on "Stop", and only a
page reload recovered it — with no user feedback and no telemetry.

- New src/hooks/useScreenShare.ts derives isScreenSharing from the reactive
  useLocalVideoTracks().hasLocalScreenShare signal, replacing the fragile
  useEffect([localParticipant]) + native 'ended' listener that missed silent
  death. The button now self-heals (no reload).
- Shows a "Your screen share stopped" toast with a working Retry action
  (manual gesture required by getDisplayMedia); ScreenShareFailedToast now
  renders the optional action.
- On unexpected death while connected, reports to Sentry (lazy
  @sentry/browser) with resolution / frame rate / duration diagnostics.
- StreamingControls rewired onto the hook (drops local state + effect +
  handleScreenShare). New stopped_message i18n key across all 6 locales.

* chore: Upgrade livekit deps

* chore: regenerate package-lock.json to fix npm ci sync

The livekit dep upgrade (e098fc5) left package-lock.json with @emnapi/core
and @emnapi/runtime referenced by @rolldown/binding-wasm32-wasi but missing
their package entries, so the cold 'npm ci' in the audit job failed. Full
regen per CLAUDE.md rule 21 backfills the cross-platform optional entries.
All drifted transitive versions stay within declared semver ranges.

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