Surface

Piece	Role
+page.server.ts	Admin via locals.isAdmin; plugin registry
+page.svelte	Plugins / Widgets / Themes / Marketplace tabs
plugins-view.svelte	Toggle enable (CSRF + toast)
marketplace-view.svelte	In-app catalog: search, type filter (incl. dashboard), license/price badges

Plugin and widget catalogs vary by install. The Marketplace tab merges local listings (themes + dashboard widget packages) with the remote catalog offline-first via GET /api/marketplace.

Control → test matrix

Control	Unit	E2E
Admin gate	✅	—
Four tabs + panels	—	✅
Plugins grid / empty	—	✅
Marketplace type filter incl. dashboard	—	✅
Dashboard widget cards (license/price)	—	✅

Run

bun run test:unit -- tests/unit/routes/extensions-page-server.test.ts
bun x playwright test tests/e2e/routes/config/extensions.spec.ts