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/helpers/templates.ts

@@ -16,8 +16,8 @@ export class ComfyTemplates {
     this.allTemplateCards = page.locator('[data-testid^="template-workflow-"]')
   }
 
-  async waitForMinimumCardCount(count: number) {
-    return await expect(async () => {
+  async expectMinimumCardCount(count: number) {
+    await expect(async () => {
       const cardCount = await this.allTemplateCards.count()
       expect(cardCount).toBeGreaterThanOrEqual(count)
     }).toPass({