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/web/server/lib/opencode/settings-helpers.test.js

@@ -154,6 +154,21 @@ describe('settings helpers', () => {
     });
   });
 
+  it('normalizes desktopWindowControlsPosition and maps legacy auto to right', () => {
+    const helpers = createTestHelpers();
+
+    expect(helpers.sanitizeSettingsUpdate({ desktopWindowControlsPosition: 'left' })).toEqual({
+      desktopWindowControlsPosition: 'left',
+    });
+    expect(helpers.sanitizeSettingsUpdate({ desktopWindowControlsPosition: 'right' })).toEqual({
+      desktopWindowControlsPosition: 'right',
+    });
+    expect(helpers.sanitizeSettingsUpdate({ desktopWindowControlsPosition: 'auto' })).toEqual({
+      desktopWindowControlsPosition: 'right',
+    });
+    expect(helpers.sanitizeSettingsUpdate({ desktopWindowControlsPosition: 'center' })).toEqual({});
+  });
+
   it('sanitizes the persisted permission auto-accept policy', () => {
     const helpers = createTestHelpers();