M3 plugin platform: frontend host, reference plugins, UI kit + docs
Completes M3 (SPEC §11 + §12 acceptance) on top of the backend platform (4e077f1).
Frontend host (§11.3):
- src/plugins/: manifest loader, runtime ESM bundle loader (framework-agnostic
mount contract), PluginSlot, PluginPage (app.page at /p/*), plugin context
(scoped api/events/i18n), capabilities hook. Wired slots into ThreadView
(message.actions/message.banner), MailLayout sidebar (sidebar.section + page nav)
and Settings→Accounts (settings.page); ws.ts fans out core + plugin.* events.
- plugin-ui.css: theme-aware .wm-* classes so bundles don't re-derive inline styles.
SDK additions:
- CurrentUserId + require_csrf (plugin-router auth), messages.envelope/header,
actions.set_flags/trash, sdk.enqueue.
Reference plugins (plugins/, installed via webmail.plugins entry points):
- hello: skeleton page-plugin (app.page + plg_hello_note w/ RLS + cron job) —
install→run→uninstall --drop-data leaves zero residue.
- labels: message.actions + sidebar.section slots, KV only, zero core diffs.
- filters: message.new hook -> match (subject/from/to) -> Mark read / Pin / Delete
(delete = move thread to Trash via the core path).
docs/plugins.md: full authoring guide + a complete "Unsubscribe button" worked
example (the §12 "writable from docs alone" bar).
Also: conftest resets the arq pool between tests (loop-bound global, like engine/redis).
Gates: backend ruff + mypy --strict (107) + full suite 337; frontend tsc + eslint
+ vitest (11) + vite build.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Rcj3TpydMTzTSmU7kunzf8
lukasandClaude Opus 4.8
d46ad13b7b