Plugins can now render UI. Page plugins appear as a nav entry and open a
full-page sandboxed iframe; the frame talks to TREK only over the postMessage
bridge.
- Server serves plugin client assets at /plugin-frame/:id/* with a strict path
guard and a locked-down, per-plugin CSP (default-src none; connect-src limited
to declared outbound hosts; sandbox WITHOUT allow-same-origin -> opaque origin,
so the frame can't read the session cookie or the parent DOM). Global CSP
frameSrc relaxed from 'none' to 'self' for exactly these frames.
- GET /api/plugins feed lists active plugins for the client.
- Client: pluginStore + PluginFrame (the trekBridge host) authenticates every
inbound message by SENDER WINDOW IDENTITY (event.source), not by a claimed id
or origin; pushes context (theme/locale/tripId/userId), validates navigation,
renders notifications as text, resizes widgets, and proxies trek:invoke to the
plugin's own routes host-side (session cookie stays with the host).
- Page route /plugins/:id + Navbar nav injection for page plugins.
Dashboard widget slot and the trek:request core-data bridge are deferred to a
later slice.
mauriceboe