refactor(browser_tests): remove deprecated proxy methods from ComfyPage

Migrate all test callers to use helper classes directly:

- nodeOps: getGraphNodesCount, getNodeRefById, selectNodes, etc.

- canvasOps: dragAndDrop, zoom, pan, resetView, etc.

- subgraph: rightClickInputSlot, connectToOutput, etc.

Reduces ComfyPage.ts from 1335 to 1085 lines (-250 lines).

Amp-Thread-ID: https://ampcode.com/threads/T-019c1318-58b7-757f-801c-5b676f0d3421
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/recordAudio.spec.ts

@@ -11,7 +11,7 @@ test.describe('Record Audio Node', { tag: '@screenshot' }, () => {
     comfyPage
   }) => {
     // Open the search box by double clicking on the canvas
-    await comfyPage.doubleClickCanvas()
+    await comfyPage.canvasOps.doubleClick()
     await expect(comfyPage.searchBox.input).toHaveCount(1)
 
     // Search for and add the RecordAudio node
@@ -19,7 +19,8 @@ test.describe('Record Audio Node', { tag: '@screenshot' }, () => {
     await comfyPage.nextFrame()
 
     // Verify the RecordAudio node was added
-    const recordAudioNodes = await comfyPage.getNodeRefsByType('RecordAudio')
+    const recordAudioNodes =
+      await comfyPage.nodeOps.getNodeRefsByType('RecordAudio')
     expect(recordAudioNodes.length).toBe(1)
 
     // Take a screenshot of the canvas with the RecordAudio node