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/selectionToolboxSubmenus.spec.ts

@@ -4,7 +4,7 @@ import { comfyPageFixture as test } from '../fixtures/ComfyPage'
 import type { ComfyPage } from '../fixtures/ComfyPage'
 
 test.beforeEach(async ({ comfyPage }) => {
-  await comfyPage.setSetting('Comfy.UseNewMenu', 'Disabled')
+  await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
 })
 
 test.describe(
@@ -12,8 +12,8 @@ test.describe(
   { tag: '@ui' },
   () => {
     test.beforeEach(async ({ comfyPage }) => {
-      await comfyPage.setSetting('Comfy.Canvas.SelectionToolbox', true)
-      await comfyPage.loadWorkflow('nodes/single_ksampler')
+      await comfyPage.settings.setSetting('Comfy.Canvas.SelectionToolbox', true)
+      await comfyPage.workflow.loadWorkflow('nodes/single_ksampler')
       await comfyPage.nextFrame()
       await comfyPage.nodeOps.selectNodes(['KSampler'])
       await comfyPage.nextFrame()