fix(desktop): restore Windows top border

apps/desktop/src/composables/__tests__/useWindowControls.spec.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { shouldReserveMacTrafficLightInset, shouldShowWindowControls } from "@/composables/useWindowControls";
+import { shouldDrawDesktopWindowFrame, shouldReserveMacTrafficLightInset, shouldShowWindowControls } from "@/composables/useWindowControls";
 
 describe("window controls", () => {
   it("shows custom controls for non-macOS desktop windows", () => {
@@ -14,6 +14,12 @@ describe("window controls", () => {
     expect(shouldShowWindowControls(false, false)).toBe(false);
   });
 
+  it("draws an app frame only for self-decorated desktop windows", () => {
+    expect(shouldDrawDesktopWindowFrame(false, true)).toBe(true);
+    expect(shouldDrawDesktopWindowFrame(true, true)).toBe(false);
+    expect(shouldDrawDesktopWindowFrame(false, false)).toBe(false);
+  });
+
   it("reserves traffic light inset only for non-fullscreen macOS desktop windows", () => {
     expect(shouldReserveMacTrafficLightInset(true, false, true)).toBe(true);
     expect(shouldReserveMacTrafficLightInset(true, true, true)).toBe(false);

apps/desktop/src/composables/useWindowControls.ts

@@ -11,6 +11,10 @@ export function shouldShowWindowControls(isMac: boolean, isDesktop = true): bool
   return isDesktop && !isMac;
 }
 
+export function shouldDrawDesktopWindowFrame(isMac: boolean, isDesktop = true): boolean {
+  return isDesktop && !isMac;
+}
+
 export function useWindowControls() {
   const isMaximized = ref(false);
   const isFullscreen = ref(false);