fix flaky version mismatch warning browser test (#5792)

Adds a wait to ensure the dismissed state is saved to localstorage
properly before `setup` (page reload).

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5792-fix-broken-test-27a6d73d365081e69c1febbc246448fa)
by [Unito](https://www.unito.io)

Author: christian-byrne

browser_tests/tests/versionMismatchWarnings.spec.ts

@@ -106,6 +106,11 @@ test.describe('Version Mismatch Warnings', () => {
     const dismissButton = warningToast.getByRole('button', { name: 'Close' })
     await dismissButton.click()
 
+    // Wait for the dismissed state to be persisted
+    await comfyPage.page.waitForFunction(
+      () => !!localStorage.getItem('comfy.versionMismatch.dismissals')
+    )
+
     // Reload the page, keeping local storage
     await comfyPage.setup({ clearStorage: false })