- Plugin manifests are now cached in sessionStorage on fetch.
- On refresh, plugin routes are registered synchronously from cache, preventing unwanted redirects to /sessions.
- Removes the !pluginsLoading guard from the catch-all route in App.tsx, as plugin routes are now always available on first render.
- Background fetch always updates the cache and routes, so new/removed plugins are reflected after reload.
- Resolves the race condition where plugin pages would redirect to /sessions on hard refresh.
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