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/vueNodes/interactions/canvas/pan.spec.ts

@@ -13,7 +13,10 @@ test.describe('Vue Nodes Canvas Pan', () => {
     '@mobile Can pan with touch',
     { tag: '@screenshot' },
     async ({ comfyPage }) => {
-      await comfyPage.panWithTouch({ x: 64, y: 64 }, { x: 256, y: 256 })
+      await comfyPage.canvasOps.panWithTouch(
+        { x: 64, y: 64 },
+        { x: 256, y: 256 }
+      )
       await expect(comfyPage.canvas).toHaveScreenshot(
         'vue-nodes-paned-with-touch.png'
       )

browser_tests/tests/vueNodes/interactions/canvas/zoom.spec.ts

@@ -26,7 +26,7 @@ test.describe('Vue Nodes Zoom', () => {
       // the node. The node should not capture the drag while drag-zooming.
       await comfyPage.page.keyboard.down('Control')
       await comfyPage.page.keyboard.down('Shift')
-      await comfyPage.dragAndDrop(
+      await comfyPage.canvasOps.dragAndDrop(
         { x: 200, y: 300 },
         { x: nodeMidpointX, y: nodeMidpointY }
       )