Add XS snapshots for dark mode (#5053)

* Add xs dark snapshots

Signed-off-by: Olga Bulat <obulat@gmail.com>

* Add xs storybook dark snapshots

Signed-off-by: Olga Bulat <obulat@gmail.com>

---------

Signed-off-by: Olga Bulat <obulat@gmail.com>

Author: obulat

frontend/test/playwright/utils/breakpoints.ts

@@ -97,7 +97,8 @@ const makeBreakpointDescribe =
             snapshotName.includes("-2xl") ||
             snapshotName.includes("-xl") ||
             snapshotName.includes("-lg") ||
-            snapshotName.includes("-sm"),
+            snapshotName.includes("-sm") ||
+            snapshotName.includes("-xs"),
         })
       }