fix(desktop): fix Linux window control order and drop auto position (#2434)

Left-side controls now use macOS traffic-light order (close, minimize,
maximize). Remove the unused auto option and default window controls to
the right for Windows and Linux frameless chrome.

Authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/lib/desktopWindowControls.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, test } from 'bun:test';
+
+import {
+  DEFAULT_DESKTOP_WINDOW_CONTROLS_POSITION,
+  getDesktopWindowControlsOrder,
+  normalizeDesktopWindowControlsPosition,
+  resolveDesktopWindowControlsSide,
+} from './desktop';
+
+describe('desktop window controls position', () => {
+  test('defaults to right', () => {
+    expect(DEFAULT_DESKTOP_WINDOW_CONTROLS_POSITION).toBe('right');
+    expect(resolveDesktopWindowControlsSide(undefined)).toBe('right');
+    expect(resolveDesktopWindowControlsSide('right')).toBe('right');
+    expect(resolveDesktopWindowControlsSide('left')).toBe('left');
+  });
+
+  test('maps legacy auto to right', () => {
+    expect(normalizeDesktopWindowControlsPosition('auto')).toBe('right');
+    expect(normalizeDesktopWindowControlsPosition('left')).toBe('left');
+    expect(normalizeDesktopWindowControlsPosition('right')).toBe('right');
+    expect(normalizeDesktopWindowControlsPosition('invalid')).toEqual(undefined);
+  });
+
+  test('left uses macOS traffic-light order', () => {
+    expect(getDesktopWindowControlsOrder('left')).toEqual(['close', 'minimize', 'maximize']);
+  });
+
+  test('right uses Windows order', () => {
+    expect(getDesktopWindowControlsOrder('right')).toEqual(['minimize', 'maximize', 'close']);
+  });
+});