fix: improve OpenCode update and desktop menu behavior

Restart OpenCode after successful updates so the new version is active
Open native About menu into the app About dialog
Update desktop View menu actions for the new layout

packages/web/server/lib/opencode/DOCUMENTATION.md

@@ -73,6 +73,8 @@ This module provides OpenCode server integration utilities for the web server ru
   - `GET /api/config/settings`
   - `PUT /api/config/settings`
   - `GET /api/config/opencode-resolution`
+  - `POST /api/opencode/upgrade` (proxies OpenCode upgrade, then restarts managed OpenCode so the new binary is active)
+  - `GET /api/opencode/upgrade-status`
   - `POST /api/opencode/directory`
   - `GET /api/provider/:providerId/source`
   - `DELETE /api/provider/:providerId/auth`

packages/web/server/lib/opencode/routes.js

@@ -155,7 +155,20 @@ export const registerOpenCodeRoutes = (app, dependencies) => {
           error: payload?.error || response.statusText || 'Failed to upgrade OpenCode',
         });
       }
-      return res.json(payload ?? { success: true });
+
+      try {
+        await refreshOpenCodeAfterConfigChange('OpenCode upgrade');
+      } catch (restartError) {
+        return res.status(500).json({
+          success: false,
+          upgraded: true,
+          error: restartError instanceof Error
+            ? `OpenCode upgraded, but restart failed: ${restartError.message}`
+            : 'OpenCode upgraded, but restart failed',
+        });
+      }
+
+      return res.json({ ...(payload ?? { success: true }), restarted: true });
     } catch (error) {
       console.error('Failed to upgrade OpenCode:', error);
       return res.status(500).json({