feat(meetings): global recording, persistence, summary, tools, discreet detection

[cabcookie]

Summary

Stage 2 of the Nova 2 Sonic meeting features. The recording now survives navigation, is controllable from the header, persists its transcript + summary, and the person detection is far less intrusive.

Recording survives navigation

• Lifts the Sonic engine into a global RecordingProvider (contexts/RecordingContext.tsx) mounted in _app.tsx — the only boundary that survives page navigation. A live recording keeps running when leaving the meeting page.
• Adds stream cleanup on app-level unmount (fixes the previous mic/system-audio + Bedrock stream leak when the meeting page unmounted).
• useSonicTranscription no longer takes a fixed meetingId; the meeting page binds its meeting via bindMeeting(...), and activeMeetingId tracks which meeting the single session belongs to.

Header indicator

• RecordingIndicator in the header: audio pulse, elapsed time, a link back to the meeting being recorded, and a stop button usable from anywhere.

Provisional persistence

• New Meeting fields sonicTranscript (json), sonicSummary (json), sonicTranscriptUpdatedAt (datetime). Wired into useMeetings (type, selection set, mapper).
• Transcript is persisted periodically while recording and on stop; summary is persisted after generation. Both rehydrate when returning to the meeting.

Discreet person detection

• Replaces the always-on detected-people bar with a discreet marker (unconfirmed-count badge + transient detected hint that self-clears + a knocking popover). Reused on the meeting page and in the header.

Server-side summarizer + context

• summarize-meeting Lambda + query (Sonnet 4.5): per-project accomplishments / new tasks / blockers grounded in the transcript.
• Meeting context enrichment for Sonic: participants + open-project list at startup and cross-modal updates; suggest_project tool; suggested-projects bar + summary view.

User prompt (Tools)

• Per-context user background fed into the Sonic system prompt. /profile/tools tab with on-blur autosave.

Dev helper

• scripts/copy-project-to-sandbox.js: multiple --project ids + --skip-images.

Testing

• tsc --noEmit (root) — green
• tsc --noEmit -p amplify/tsconfig.json — green
• npm run lint — 0 errors (2 pre-existing TanStack Table warnings, unrelated)
• Deployed to sandbox; recording survives navigation, header stop works, transcript/summary rehydrate.

Notes / follow-ups

• Transcript/summary persistence is intentionally provisional (to be folded into meeting notes later).
• Known follow-up (separate work, Block A): the person data layer still loads all people into memory; a meeting participant not in the loaded set renders no name. Addressed next.