fix: tab switcher on windows desktop (#6812)

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/T2klNLEk0wxLh4NRDzhk/f33388aa-cc2d-417f-a742-86ebd74e3d5a.png)

packages/frontend/core/src/modules/multi-tab-sidebar/view/header-switcher.css.ts

@@ -5,6 +5,7 @@ export const switchRootWrapper = style({
   height: '52px',
   display: 'flex',
   alignItems: 'center',
+  flexShrink: 0,
 });
 export const switchRoot = style({
   vars: {