feat(plugins): redesign the admin plugins page — search, filters, cleaner cards

The panel was cramped and hard to scan. Rebuilt it as a proper management
surface:

- A segmented Installed/Discover switch with counts, and a real toolbar:
  search, filter by type, filter by status (active/off/update/error), and
  sort (name/recent/updates first).
- An "N updates available · Update all" bar.
- Installed rows are tidied up: a single health dot on the icon tile
  instead of a wall of badges, and capability chips underneath that show
  what each plugin can actually reach at a glance (reads your trips,
  dashboard widget, the hosts it talks to) — the reach is now visible
  without opening anything. Update, toggle and a ⋯ menu (restart, errors,
  source, uninstall) sit on the right.
- The registry browser is now an App-Store-style card grid: screenshot
  with the plugin's icon chip, a reviewed badge, consistent heights.
- The detail dialog gained "What it can access", "Connects to" and a
  details grid (version, size, requires, reviewed).

To feed the capability chips, the installed list now returns each plugin's
declared permissions and capabilities. New copy is in all 22 locales.

server/src/nest/plugins/plugins.service.ts

@@ -25,6 +25,10 @@ export interface PluginListItem {
   last_error: string | null;
   reviewed_at: string | null;
   source_repo: string | null;
+  /** Declared permissions (JSON string) — drives the "what this can access" chips. */
+  permissions: string;
+  /** Declared capabilities (JSON string) — e.g. widget slot. */
+  capabilities: string;
 }
 
 @Injectable()
@@ -32,7 +36,8 @@ export class PluginsService {
   list(): { enabled: boolean; plugins: PluginListItem[] } {
     const plugins = db
       .prepare(
-        `SELECT id, name, description, type, icon, version, status, enabled, last_error, reviewed_at, source_repo
+        `SELECT id, name, description, type, icon, version, status, enabled, last_error, reviewed_at, source_repo,
+                permissions, capabilities
          FROM plugins
          ORDER BY sort_order, name`,
       )