test: replace waitForTimeout with retrying assertions

- widget.spec.ts: use expect().toPass() for combo refresh

- subgraph.spec.ts: use comfyPage.setup() after reload

- nodeLibrary.spec.ts: use toHaveCount() for debounced search

- remoteWidgets.spec.ts: use expect().toPass() for backoff test

- litegraphUtils.ts: refactor navigateIntoSubgraph to use toPass()

Amp-Thread-ID: https://ampcode.com/threads/T-019c11f1-e839-772c-8890-b77cfdf70124
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/sidebar/nodeLibrary.spec.ts

@@ -336,8 +336,6 @@ test.describe('Node library sidebar', () => {
 
     const tab = comfyPage.menu.nodeLibraryTab
     await tab.nodeLibrarySearchBoxInput.fill('KSampler')
-    // Node search box is debounced and may take some time to update.
-    await comfyPage.page.waitForTimeout(1000)
-    expect(await tab.getNode('KSampler (Advanced)').count()).toBe(2)
+    await expect(tab.getNode('KSampler (Advanced)')).toHaveCount(2)
   })
 })