refactor: remove ComfyPage wrapper methods, use helpers directly

- Remove 27 deprecated/wrapper methods from ComfyPage
- Migrate callers to use helper classes directly:
  - keyboard.selectAll/bypass/undo/redo/moveUp/moveDown
  - clipboard.copy/paste
  - settings.setSetting/getSetting
  - workflow.loadWorkflow/deleteWorkflow/setupWorkflowsDirectory
  - contextMenu.clickMenuItem/clickLitegraphMenuItem
  - nodeOps.resizeNode with DefaultGraphPositions
  - canvasOps.clickEmptySpace with DefaultGraphPositions
- Replace deprecated node click methods with direct canvas clicks
- Replace position getter properties with DefaultGraphPositions imports

Amp-Thread-ID: https://ampcode.com/threads/T-019c15e7-2319-76ec-855e-098ec75ef18a
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/vueNodes/widgets/text/multilineStringWidget.spec.ts

@@ -1,12 +1,9 @@
-import {
-  type ComfyPage,
-  comfyExpect as expect,
-  comfyPageFixture as test
-} from '../../../../fixtures/ComfyPage'
+import { comfyExpect as expect, comfyPageFixture as test } from '../../../../fixtures/ComfyPage';
+import type { ComfyPage } from '../../../../fixtures/ComfyPage';
 
 test.describe('Vue Multiline String Widget', () => {
   test.beforeEach(async ({ comfyPage }) => {
-    await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)
+    await comfyPage.settings.setSetting('Comfy.VueNodes.Enabled', true)
     await comfyPage.vueNodes.waitForNodes()
   })