test(browser): refactor browser tests for reliability and maintainability (#8510)

## Summary

Major refactoring of browser tests to improve reliability,
maintainability, and type safety.

## Changes

### Test Infrastructure Decomposition
- Decomposed `ComfyPage.ts` (~1000 lines) into focused helpers:
- `CanvasHelper`, `DebugHelper`, `SubgraphHelper`,
`NodeOperationsHelper`
- `SettingsHelper`, `WorkflowHelper`, `ClipboardHelper`,
`KeyboardHelper`
- Created `ContextMenu` page object, `BaseDialog` base class, and
`BottomPanel` page object
- Extracted `DefaultGraphPositions` constants

### Locator Stability
- Added `data-testid` attributes to Vue components (sidebar, dialogs,
node library)
- Created centralized `selectors.ts` with test ID constants
- Replaced fragile CSS selectors (`.nth()`, `:nth-child()`) with
`getByTestId`/`getByRole`

### Performance & Reliability
- Removed `setTimeout` anti-patterns (replaced with `waitForFunction`)
- Replaced `waitForTimeout` with retrying assertions
- Replaced hardcoded coordinates with computed `NodeReference` positions
- Enforced LF line endings for all text files

### Type Safety
- Enabled `no-explicit-any` lint rule for browser_tests via oxlint
- Purged `as any` casts from browser_tests
- Added Window type augmentation for standardized window access
- Added proper type annotations throughout

### Bug Fixes
- Restored `ExtensionManager` API contract
- Removed test-only settings from production schema
- Fixed flaky selectors and missing test setup

## Testing
- All browser tests pass
- Typecheck passes


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Tests**
* Overhauled browser E2E test infrastructure with many new
helpers/fixtures, updated test APIs, and CI test container image bumped
for consistency.

* **Chores**
* Standardized line endings and applied stricter lint rules for browser
tests; workspace dependency version updated.

* **Documentation**
* Updated Playwright and TypeScript testing guidance and test-run
commands.

* **UI**
* Added stable data-testids to multiple components to improve
testability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

browser_tests/tests/execution.spec.ts

@@ -3,7 +3,7 @@ import { expect } from '@playwright/test'
 import { comfyPageFixture as test } from '../fixtures/ComfyPage'
 
 test.beforeEach(async ({ comfyPage }) => {
-  await comfyPage.setSetting('Comfy.UseNewMenu', 'Disabled')
+  await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
 })
 
 test.describe('Execution', { tag: ['@smoke', '@workflow'] }, () => {
@@ -11,12 +11,15 @@ test.describe('Execution', { tag: ['@smoke', '@workflow'] }, () => {
     'Report error on unconnected slot',
     { tag: '@screenshot' },
     async ({ comfyPage }) => {
-      await comfyPage.disconnectEdge()
-      await comfyPage.clickEmptySpace()
+      await comfyPage.canvasOps.disconnectEdge()
+      await comfyPage.canvasOps.clickEmptySpace()
 
-      await comfyPage.executeCommand('Comfy.QueuePrompt')
+      await comfyPage.command.executeCommand('Comfy.QueuePrompt')
       await expect(comfyPage.page.locator('.comfy-error-report')).toBeVisible()
-      await comfyPage.page.locator('.p-dialog-close-button').click()
+      await comfyPage.page
+        .locator('.p-dialog')
+        .getByRole('button', { name: 'Close' })
+        .click()
       await comfyPage.page.locator('.comfy-error-report').waitFor({
         state: 'hidden'
       })
@@ -32,17 +35,17 @@ test.describe(
   { tag: ['@smoke', '@workflow'] },
   () => {
     test('Execute to selected output nodes', async ({ comfyPage }) => {
-      await comfyPage.loadWorkflow('execution/partial_execution')
-      const input = await comfyPage.getNodeRefById(3)
-      const output1 = await comfyPage.getNodeRefById(1)
-      const output2 = await comfyPage.getNodeRefById(4)
+      await comfyPage.workflow.loadWorkflow('execution/partial_execution')
+      const input = await comfyPage.nodeOps.getNodeRefById(3)
+      const output1 = await comfyPage.nodeOps.getNodeRefById(1)
+      const output2 = await comfyPage.nodeOps.getNodeRefById(4)
       expect(await (await input.getWidget(0)).getValue()).toBe('foo')
       expect(await (await output1.getWidget(0)).getValue()).toBe('')
       expect(await (await output2.getWidget(0)).getValue()).toBe('')
 
       await output1.click('title')
 
-      await comfyPage.executeCommand('Comfy.QueueSelectedOutputNodes')
+      await comfyPage.command.executeCommand('Comfy.QueueSelectedOutputNodes')
       await expect(async () => {
         expect(await (await input.getWidget(0)).getValue()).toBe('foo')
         expect(await (await output1.getWidget(0)).getValue()).toBe('foo')