feat: auto-generate Podcasting 2.0 chapters from episode timestamps

[ChadFarrow]

Summary

• Auto-parses timestamp lines (e.g. 00:00 Intro, 1:00:12 - Wrap Up) from episode content at build time and generates Podcasting 2.0 JSON chapter files in dist/chapters/
• Episodes with an existing chaptersUrl (uploaded JSON) are skipped — auto-parsing is a fallback only
• Client-side RSS generator now passes through transcriptUrl and chaptersUrl and renders <podcast:transcript> / <podcast:chapters> tags
• Documents transcript and chapters as optional tags for Kind 30054 in NIP.md

Supported timestamp formats

Tested against real content from Soapbox Sessions and Nostr Compass:

Format	Example
MM:SS Title	00:00 Intro
MM:SS - Title	00:00 - Intro
H:MM:SS Title	1:00:12 Wrap Up
HH:MM:SS Title	01:45:35 Outro

Files changed

File	Change
src/lib/parseChapters.ts	new — parser + JSON generator
src/lib/parseChapters.test.ts	new — 12 unit tests
scripts/build-rss.ts	generate chapter JSON files during build
src/lib/rssGenerator.ts	pass through chaptersUrl/transcriptUrl, render in XML
NIP.md	document chapters and transcript tags

Test plan

• All 24 tests pass (npm test)
• TypeScript, ESLint, and Vite build pass
• Verified parser output against real Soapbox Sessions and Nostr Compass content samples

🤖 Generated with Claude Code

[ChadFarrow]

I used the Soapbox Sessions and Nostr Compass RSS feeds as reference for this but wont know if the chapters worked until this is run. It takes the timestamps and makes PC 2.0 chapters from it so listeners can skip around in the app.