feat: add eslint-plugin-playwright via oxlint JS plugins (#11136)

## Summary

Add eslint-plugin-playwright as an oxlint JS plugin scoped to
browser_tests/, enforcing Playwright best practices at lint time.

## Changes

- **What**: Configure eslint-plugin-playwright@2.10.1 via oxlint's alpha
`jsPlugins` field (`.oxlintrc.json` override scoped to
`browser_tests/**/*.ts`). 18 recommended rules +
`prefer-native-locators` + `require-to-pass-timeout` at error severity.
All 173 initial violations resolved (config, auto-fix, manual fixes).
`no-force-option` set to off — 28 violations need triage (canvas overlay
workarounds vs unnecessary force) in a dedicated PR.
- **Dependencies**: `eslint-plugin-playwright@^2.10.1` (devDependency,
required by oxlint jsPlugins at runtime)

## Review Focus

- `.oxlintrc.json` override structure — this is the first use of
oxlint's JS plugins alpha feature in this repo
- Manual fixes in spec files: `waitForSelector` → `locator.waitFor`,
deprecated page methods → locator equivalents, `toPass()` timeout
additions
- Compound CSS selectors replaced with `.and()` (Playwright native
locator composition) to avoid `prefer-native-locators` suppressions
- Lint script changes in `package.json` to include `browser_tests/` in
oxlint targets

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: GitHub Action <action@github.com>

browser_tests/tests/templates.spec.ts

@@ -40,6 +40,7 @@ test.describe('Templates', { tag: ['@slow', '@workflow'] }, () => {
   // page.route(), and change checkTemplateFileExists to use browser-context
   // fetch (page.request.head bypasses Playwright routing).
   // https://github.com/Comfy-Org/ComfyUI_frontend/issues/3992
+  // oxlint-disable-next-line playwright/no-skipped-test -- https://github.com/Comfy-Org/ComfyUI_frontend/issues/3992
   test.skip('should have all required thumbnail media for each template', async ({
     comfyPage
   }) => {
@@ -185,8 +186,8 @@ test.describe('Templates', { tag: ['@slow', '@workflow'] }, () => {
     await comfyPage.command.executeCommand('Comfy.BrowseTemplates')
     await comfyPage.templates.content.waitFor({ state: 'visible' })
 
-    const templateGrid = comfyPage.page.locator(
-      '[data-testid="template-workflows-content"]'
+    const templateGrid = comfyPage.page.getByTestId(
+      'template-workflows-content'
     )
     const nav = comfyPage.page.locator('header', { hasText: 'Templates' })
 
@@ -302,20 +303,18 @@ test.describe('Templates', { tag: ['@slow', '@workflow'] }, () => {
 
       // Wait for cards to load
       await expect(
-        comfyPage.page.locator(
-          '[data-testid="template-workflow-short-description"]'
-        )
+        comfyPage.page.getByTestId('template-workflow-short-description')
       ).toBeVisible()
 
       // Verify all three cards with different descriptions are visible
-      const shortDescCard = comfyPage.page.locator(
-        '[data-testid="template-workflow-short-description"]'
+      const shortDescCard = comfyPage.page.getByTestId(
+        'template-workflow-short-description'
       )
-      const mediumDescCard = comfyPage.page.locator(
-        '[data-testid="template-workflow-medium-description"]'
+      const mediumDescCard = comfyPage.page.getByTestId(
+        'template-workflow-medium-description'
       )
-      const longDescCard = comfyPage.page.locator(
-        '[data-testid="template-workflow-long-description"]'
+      const longDescCard = comfyPage.page.getByTestId(
+        'template-workflow-long-description'
       )
 
       await expect(shortDescCard).toBeVisible()
@@ -333,8 +332,8 @@ test.describe('Templates', { tag: ['@slow', '@workflow'] }, () => {
       await expect(longDesc).toContainText('much longer description')
 
       // Verify grid layout maintains consistency
-      const templateGrid = comfyPage.page.locator(
-        '[data-testid="template-workflows-content"]'
+      const templateGrid = comfyPage.page.getByTestId(
+        'template-workflows-content'
       )
       await expect(templateGrid).toBeVisible()
       await expect(templateGrid).toHaveScreenshot(