feat(ui): meeting audio export + document export integration (MEET-7)

[eliotlim]

Problem

Recorded meeting audio must be exportable as ordinary files — a hard requirement (owner records in Singapore, a single-party-consent jurisdiction; audio is the evidence). Document exports also needed the full meeting record. Board: MEET-7.

Solution

Per-block Export audio: single chunk → direct download; multi-chunk → ZIP (fflate, already a dep; stored not recompressed — exact original bytes, no stitching/transcoding) with lexicographically-safe, human-readable entry names (001-00h00m45s.webm). Untranscribed and mid-recording chunks are always exportable; failures abort cleanly (no partial zips) with retry. Document exports: md/html/pdf carry transcript + summary + notes + per-chunk audio links; page-zip/site exports embed the audio bytes; collection dedupes via collectAssetIds. Export works read-only (reading ≠ writing). Stacked on #372 — merge after it.

Key files: packages/ui/src/blockeditor/{meetingAudioExport.ts,meetingAudio.ts,exportBlocks.ts}, packages/ui/src/export/{exportAssets.ts,toHtml.ts}, tests meetingAudioExport.test.tsx + exportMeeting.test.ts.

Before / After

Behavior	Before	After
Get recorded audio out	not possible	one click: file or ordered ZIP, exact original bytes — zip round-tripped byte-for-byte in tests
Chunk uploaded but never transcribed	n/a	still exportable (audio ≠ transcript) — tested
md/html/pdf export of a meeting page	transcript+summary+notes only	+ per-chunk audio download links; page-zip/site include audio bytes
Read-only viewer	n/a	can export audio; doc provably unmutated — tested

Visual delta is one button in the existing block chrome; full block captures live in #369.

Test procedure

VITEST_MAX_WORKERS=1 pnpm verify green incl. e2e. Targeted: pnpm --filter @book.dev/ui exec vitest run src/blockeditor/__tests__/meetingAudioExport.test.tsx src/export/__tests__/exportMeeting.test.ts.

Operational notes

No deps added (fflate reused), no env/migration. ~175MB transient memory at a 2h-meeting envelope (sequential fetch, in-memory zip) — acceptable, documented. PDF can't embed audio; the link text renders visibly so absence is never silent. Desktop save path unchanged (downloadBlob); live desktop validation rides MEET-8's signed-build acceptance.

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Verify: green serialized. Reviews cleared: product/metrics (Parker — BLOCK→CLEAR after naming fix), code (Quinn). Final HEAD b8ca146.

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Project	Deployment	Actions	Updated
app.book.pub	Canceled		Oct 4, 2026 2:13pm UTC