fix(session-replay-browser): revert e2e port to 5173

The port change was a local-dev convenience to coexist with another
worktree. It broke the urlMaskLevels e2e suite because privacy.spec.ts
hardcodes localhost:5173 in MATCHING_PATTERN, so URL rules never matched
on 5174 and inputs fell back to the default mask level.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: lewgordon-amplitude

packages/session-replay-browser/playwright.config.ts

@@ -2,9 +2,6 @@ import path from 'path';
 import { defineConfig } from '@playwright/test';
 import baseConfig from '../../playwright.config';
 
-// Use 5174 so the test server can coexist with a main-branch dev server on 5173.
-const PORT = 5174;
-
 export default defineConfig({
   ...baseConfig,
   testMatch: '**/e2e/**/*.spec.ts',
@@ -13,14 +10,10 @@ export default defineConfig({
     ['json', { outputFile: 'e2e/results.json' }],
     ['html', { open: 'never' }],
   ],
-  use: {
-    ...baseConfig.use,
-    baseURL: `http://localhost:${PORT}`,
-  },
   webServer: {
-    command: `pnpm exec vite dev --port ${PORT} --clearScreen=false`,
+    command: 'pnpm exec vite dev --port 5173 --clearScreen=false',
     cwd: path.resolve(__dirname, '../..'),
-    url: `http://localhost:${PORT}`,
+    url: 'http://localhost:5173',
     reuseExistingServer: !process.env.CI,
     timeout: 30000,
   },