# Session 0019.3 — Transcript

Parent: SESSION-0019.0-TRANSCRIPT-… (UX-polish wave, rfc-app v0.21.0)
Subagent ordinal: .3 — roadmap item #32 (session/transcript page
polish) + the /docs surfaces' share of #31.

## Goal

In the isolated worktree `/Users/benstull/git/rfc-app-v0.21.0-docs`
on branch `feature/v0.21.0-docs-32`:

(a) Collapse single-transcript session roots — render the transcript
    inline at `/docs/sessions/:nnnn` instead of a dead-end placeholder;
    multi-transcript sessions inline the `.0` driver transcript and
    list the siblings.
(b) Add a transcript metadata header (title, started/ended parsed from
    the filename ISO segments, derived duration, optional `tldr` from
    the manifest, external view-source link).
(c) Docs-surface token polish + consistent loading/empty/error states +
    aria-labels on icon-only controls.

## Pre-state

- Foundation commit carried `frontend/src/styles/tokens.css` (the #31
  design-token module). Build requires `VITE_APP_NAME` (no default).
- `/docs/sessions/:nnnn` (DocsSessionIndex.jsx) rendered a
  `.docs-session-overview` placeholder: "N transcript(s) in this
  session. Select one from the navigation."
- DocsSessionTranscript.jsx rendered body via MarkdownPreview with a
  breadcrumb but no metadata header.
- Backend `/api/docs/sessions/manifest` (api.py:177-178) returns
  `result["manifest"]` verbatim — the full `sessions.json` object —
  so arbitrary per-entry fields already reach the frontend.

## Turn-by-turn arc (honest)

1. Read tokens.css, SESSION-PROTOCOL.md (§1 naming + the 0017.0
   folder-layout amendment + the sessions.json shape), all seven owned
   docs components, api.js docs helpers, docs_sessions.py, and the
   api.py manifest route.
2. Confirmed the manifest endpoint is a pass-through → **no backend
   change needed** for `tldr`. The decision branch in the task was
   resolved in favor of "already passes through".
3. Read the existing docs CSS block in App.css (read-only) to learn
   which classes a sibling owns (.docs-article, .docs-empty,
   .docs-error, .docs-source-link, .docs-session-overview, etc.) so
   Docs.css would not collide.
4. Rewrote DocsSessionTranscript.jsx: exported `gitSourceUrl`,
   `transcriptOrdinal`, `parseTranscriptMeta`, and `TranscriptMetaHeader`;
   added a manifest fetch for title+tldr; rendered the header above the
   body.
5. Rewrote DocsSessionIndex.jsx to inline-render the primary transcript
   (driver `.0` preferred, else `files[0]`) and list siblings; reused
   the imported header + ordinal helpers.
6. Created Docs.css (new classes only, all token-valued).
7. Brought DocsUserGuide's bare `<p className="error">` onto the shared
   `.docs-error` + retry convention.
8. Build failed first run (VITE_APP_NAME unset — env requirement, not
   my change); re-ran with `VITE_APP_NAME="OHM Verify" npm run build`
   → green (974 kB index chunk; >500 kB warning expected/benign).
9. Staged the four files explicitly (avoided the `frontend/node_modules`
   symlink), committed.

## Design decisions

**Inline-collapse (a).** URL stays stable to the session number — the
session root fetches the index, picks a primary file, fetches its body,
and renders the same `TranscriptMetaHeader` + `philosophy-body` the
standalone route uses. No `<Navigate>`, no 301. Primary selection:
`SESSION-NNNN.0-TRANSCRIPT…` if present, else `files[0]` (backend
returns the list pre-sorted). For multi-transcript sessions, a
`.docs-session-siblings` strip lists every transcript ordinal — the
primary marked "(shown below)" with `aria-current`, the rest linking to
`/docs/sessions/:nnnn/:filename`. No empty placeholder remains on any
path that has at least one transcript.

**Metadata header (b).** `parseTranscriptMeta` regexes the
`-TRANSCRIPT-<start>--<end>.md` ISO segment (`YYYY-MM-DDTHH-MM` x2,
colons-as-dashes per protocol). Times are built as **local** Dates and
rendered as wall-clock via `toLocaleString` — the filename encodes no
timezone (PST implied), and duration is a difference of two same-basis
Dates so the implied-TZ ambiguity cancels. Legacy renamed-letter
transcripts (no segment) → all derived fields null → header shows just
the title + source link (graceful degrade). Duration omitted when
start==end or unparseable.

**tldr schema (b).** Consumed as a **string** field named `tldr` on the
per-session entry of `sessions.json`, i.e. keyed by the 4-digit session
number alongside `title`:
```json
{ "0019": { "title": "UX-polish wave …", "tldr": "One-line summary." } }
```
Read via `getSessionsManifest()` → `payload[nnnn].tldr`; rendered only
when `typeof === 'string'` and truthy. Absent ⇒ no TL;DR line.

**Polish (c).** Docs.css styles ONLY the two new element families
(`.docs-transcript-meta*`, `.docs-session-siblings*`), every value a
tokens.css custom property, to avoid racing the #31 App.css sweep for
the pre-existing docs selectors. DocsUserGuide normalized to the shared
error convention. All icon-only controls already carried aria-labels
(verified the drawer toggle `☰`, scrim) — no aria gaps found in owned
files.

## Cut state

- Branch: `feature/v0.21.0-docs-32`
- Final commit SHA: `adb5d2571532ad5992900791d295ef214ddfba0d`
- Files changed (4):
  - `frontend/src/components/DocsSessionIndex.jsx` (rewrite — inline collapse)
  - `frontend/src/components/DocsSessionTranscript.jsx` (rewrite — meta header + exports)
  - `frontend/src/components/DocsUserGuide.jsx` (error-state normalize)
  - `frontend/src/components/Docs.css` (new)
- **Backend: NOT changed.** docs_sessions.py untouched — manifest
  pass-through already exposes `tldr`. (No py_compile needed.)
- Build: GREEN (`VITE_APP_NAME=… npm run build`; 974 kB chunk warning benign).

## What the driver needs to know

- **No backend coordination required** for this item — frontend renders
  `tldr` when present; the field's value-backfill is the documented
  out-of-scope follow-up.
- **sessions.json `tldr` schema to backfill** (driver/operator task in
  `wiggleverse/ohm-session-history`): add an optional `"tldr": "<one
  line>"` string to any per-session entry next to `"title"`. The
  frontend already consumes it on both the inline session-root view and
  the standalone transcript view. Absent ⇒ no-op.
- Inline-collapse changes the `/docs/sessions/:nnnn` semantics: it is no
  longer nav-only. The left-nav transcript rows + sibling links still
  point at the standalone `/docs/sessions/:nnnn/:filename` route, which
  is unchanged and now also carries the metadata header.
- Build needs `VITE_APP_NAME` set (env requirement, not from this item).

## §19.2 candidates

- `parseTranscriptMeta` / `transcriptOrdinal` are filename-shape logic
  that mirrors the backend `_TRANSCRIPT_FILENAME_RE` and the nav's own
  `transcriptOrdinal` in DocsLayout.jsx — there are now two frontend
  copies of the ordinal regex (DocsLayout owns one; I export one). A
  future consolidation could lift a single `lib/transcripts.js` and have
  DocsLayout import it (DocsLayout is sibling-owned, so I did not touch
  it). Worth flagging for a follow-up de-dup.