fix: resolve circular dependency by removing comfyPageFixture re-export

- Remove comfyPageFixture re-export from ComfyPage.ts
- Update all test imports to use comfyPageFixture from its own file
- Update README.md example to show correct import path
- Fixes: comfyPageFixture → LocalhostComfyPage → ComfyPage circular import

browser_tests/tests/nodeHelp.spec.ts

@@ -1,7 +1,7 @@
 import {
   comfyExpect as expect,
   comfyPageFixture as test
-} from '../fixtures/ComfyPage'
+} from '../fixtures/comfyPageFixture'
 
 // TODO: there might be a better solution for this
 // Helper function to pan canvas and select node