test: replace expect() with waitFor() in fixture files

Per Playwright best practices, assertions belong in tests, not fixtures.
Fixture methods should use waitFor() for preconditions instead.

- vueNodeFixtures.ts: setTitle(), cancelTitleEdit() use waitFor()
- Topbar.ts: closeTopbarMenu() uses waitFor({ state: 'hidden' })
- ComfyPage.ts: ConfirmDialog.click(), closeDialog(), clickDialogButton(),
  closeToasts() all converted to waitFor()
- templates.ts: renamed waitForMinimumCardCount to expectMinimumCardCount
  to clarify it contains an assertion (uses expect().toPass() pattern)

Amp-Thread-ID: https://ampcode.com/threads/T-019c11f8-acd2-7429-8bec-525ad47a47c4
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/templates.spec.ts

@@ -189,20 +189,20 @@ test.describe('Templates', { tag: ['@slow', '@workflow'] }, () => {
     )
     const nav = comfyPage.page.locator('header', { hasText: 'Templates' })
 
-    await comfyPage.templates.waitForMinimumCardCount(1)
+    await comfyPage.templates.expectMinimumCardCount(1)
     await expect(templateGrid).toBeVisible()
     await expect(nav).toBeVisible() // Nav should be visible at desktop size
 
     const mobileSize = { width: 640, height: 800 }
     await comfyPage.page.setViewportSize(mobileSize)
-    await comfyPage.templates.waitForMinimumCardCount(1)
+    await comfyPage.templates.expectMinimumCardCount(1)
     await expect(templateGrid).toBeVisible()
     // Nav header is clipped by overflow-hidden parent at mobile size
     await expect(nav).not.toBeInViewport()
 
     const tabletSize = { width: 1024, height: 800 }
     await comfyPage.page.setViewportSize(tabletSize)
-    await comfyPage.templates.waitForMinimumCardCount(1)
+    await comfyPage.templates.expectMinimumCardCount(1)
     await expect(templateGrid).toBeVisible()
     await expect(nav).toBeVisible() // Nav should be visible at tablet size
   })