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/load/uploadWidgets.spec.ts

@@ -5,7 +5,7 @@ import {
 
 test.describe('Vue Upload Widgets', () => {
   test.beforeEach(async ({ comfyPage }) => {
-    await comfyPage.setSetting('Comfy.VueNodes.Enabled', true)
+    await comfyPage.settings.setSetting('Comfy.VueNodes.Enabled', true)
     await comfyPage.vueNodes.waitForNodes()
   })
 
@@ -14,7 +14,7 @@ test.describe('Vue Upload Widgets', () => {
     { tag: '@screenshot' },
     async ({ comfyPage }) => {
       await comfyPage.setup()
-      await comfyPage.loadWorkflow('widgets/all_load_widgets')
+      await comfyPage.workflow.loadWorkflow('widgets/all_load_widgets')
       await comfyPage.vueNodes.waitForNodes()
 
       await expect(comfyPage.canvas).toHaveScreenshot(