fix: module-mocking import from dist, increase playwright firefox timeout

- Import moduleMockingPlugin from dist/ in tests (Node 24 type stripping
  with source imports causes plugin serve hook issues)
- Increase playwright firefox and all-browsers timeout from 20s to 60s
  (firefox consistently needs more time in CI)

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

packages/test-runner-module-mocking/test/moduleMockingPlugin.test.ts

@@ -6,7 +6,7 @@ import { runTests } from '@web/test-runner-core/test-helpers';
 import { chromeLauncher } from '@web/test-runner-chrome';
 import { nodeResolvePlugin } from '@web/dev-server';
 
-import { moduleMockingPlugin } from '../src/moduleMockingPlugin.ts';
+import { moduleMockingPlugin } from '../dist/moduleMockingPlugin.js';
 
 const dirname = fileURLToPath(new URL('.', import.meta.url));
 

packages/test-runner-playwright/test/playwrightLauncher.test.ts

@@ -37,7 +37,7 @@ describe('test-runner-playwright webkit', { timeout: 20000 }, () => {
 
 // we don't run all tests in the windows CI
 if (os.platform() !== 'win32') {
-  describe('test-runner-playwright firefox', { timeout: 20000 }, () => {
+  describe('test-runner-playwright firefox', { timeout: 60000 }, () => {
     function createConfig() {
       return { browsers: [playwrightLauncher({ product: 'firefox' })] };
     }
@@ -54,7 +54,7 @@ if (os.platform() !== 'win32') {
     });
   });
 
-  describe('test-runner-playwright all', { timeout: 20000 }, () => {
+  describe('test-runner-playwright all', { timeout: 60000 }, () => {
     function createConfig() {
       return {
         browsers: [