fix(ui): gate custom window controls on the full bridge surface

Include getWindowState and onWindowStateChange in the
usesCustomWindowControls capability check — the controls rely on both
for initial state and for keeping the maximize/restore glyph in sync
with OS-triggered changes, so a partial bridge should not mount them.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

libs/services/src/lib/runtime-capabilities.service.ts

@@ -54,9 +54,13 @@ export class RuntimeCapabilitiesService {
     get usesCustomWindowControls(): boolean {
         return (
             (this.isWindows || this.isLinux) &&
-            ['minimizeWindow', 'toggleMaximizeWindow', 'closeWindow'].every(
-                (methodName) => this.hasElectronMethod(methodName)
-            )
+            [
+                'minimizeWindow',
+                'toggleMaximizeWindow',
+                'closeWindow',
+                'getWindowState',
+                'onWindowStateChange',
+            ].every((methodName) => this.hasElectronMethod(methodName))
         );
     }