---
id: T01
parent: S05
milestone: M014
provides: []
requires: []
affects: []
key_files: ["frontend/src/api/public-client.ts", "frontend/src/pages/TechniquePage.tsx", "frontend/src/components/TableOfContents.tsx", "frontend/src/utils/citations.tsx", "frontend/src/App.css"]
key_decisions: ["Subsection IDs use compound slugs (sectionSlug--subSlug) to avoid collisions", "TOC uses CSS counters for numbered references", "Invalid citation indices render as plain text"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "Build verification: `cd frontend && npm run build` exits 0, producing 56 modules with no TypeScript or Vite errors."
completed_at: 2026-04-03T01:42:45.503Z
blocker_discovered: false
---

# T01: Added format-aware v2 body_sections rendering with nested TOC, citation anchor links, and subsection styles while preserving v1 dict rendering unchanged

> Added format-aware v2 body_sections rendering with nested TOC, citation anchor links, and subsection styles while preserving v1 dict rendering unchanged

## What Happened
---
id: T01
parent: S05
milestone: M014
key_files:
  - frontend/src/api/public-client.ts
  - frontend/src/pages/TechniquePage.tsx
  - frontend/src/components/TableOfContents.tsx
  - frontend/src/utils/citations.tsx
  - frontend/src/App.css
key_decisions:
  - Subsection IDs use compound slugs (sectionSlug--subSlug) to avoid collisions
  - TOC uses CSS counters for numbered references
  - Invalid citation indices render as plain text
duration: ""
verification_result: passed
completed_at: 2026-04-03T01:42:45.504Z
blocker_discovered: false
---

# T01: Added format-aware v2 body_sections rendering with nested TOC, citation anchor links, and subsection styles while preserving v1 dict rendering unchanged

**Added format-aware v2 body_sections rendering with nested TOC, citation anchor links, and subsection styles while preserving v1 dict rendering unchanged**

## What Happened

Updated TechniquePageDetail TypeScript types with body_sections_format, source_videos, and BodySectionV2/BodySubSectionV2 interfaces. Built format-aware rendering in TechniquePage.tsx: v2 array format renders TableOfContents + H2 sections with slugified IDs + H3 subsections, all with citation parsing. V1 dict rendering unchanged. Created TableOfContents component with CSS-counter-numbered nested anchor links. Created parseCitations utility that converts [N] and [N,M] markers to superscript anchor links targeting key moment IDs. Updated snapshotToOverlay for v2 format passthrough. Added CSS for TOC card, subsection borders, citation superscripts, and scroll-margin-top on anchored sections.

## Verification

Build verification: `cd frontend && npm run build` exits 0, producing 56 modules with no TypeScript or Vite errors.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd frontend && npm run build` | 0 | ✅ pass | 3500ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `frontend/src/api/public-client.ts`
- `frontend/src/pages/TechniquePage.tsx`
- `frontend/src/components/TableOfContents.tsx`
- `frontend/src/utils/citations.tsx`
- `frontend/src/App.css`


## Deviations
None.

## Known Issues
None.
