feat(desktop): sync title bar theme with resolved app theme

packages/app/src/desktop/electron/window.ts

@@ -27,3 +27,12 @@ export async function isDesktopFullscreen(): Promise<boolean> {
   }
   return await win.isFullscreen();
 }
+
+export async function setDesktopTitleBarTheme(theme: "light" | "dark"): Promise<void> {
+  const win = getDesktopWindow();
+  if (!win || typeof win.setTitleBarTheme !== "function") {
+    return;
+  }
+
+  await win.setTitleBarTheme(theme);
+}

packages/app/src/desktop/host.ts

@@ -51,6 +51,7 @@ export interface DesktopWindowBridge {
   endMove?: () => void;
   toggleMaximize?: () => Promise<void>;
   isFullscreen?: () => Promise<boolean>;
+  setTitleBarTheme?: (theme: "light" | "dark") => Promise<void>;
   onResized?: <TEvent = unknown>(
     handler: (event: TEvent) => void,
   ) => Promise<() => void> | (() => void);