integration: return HTTP 404 for unmatched URLs and close remaining browser-gate gaps

Co-authored-by: Cursor <cursoragent@cursor.com>

eslint.config.js

@@ -11,8 +11,6 @@ module.exports = tseslint.config(
       '.angular/**',
       'node_modules/**',
       'coverage/**',
-      'e2e/**',
-      'playwright.config.ts',
       'playwright-report/**',
       'test-results/**',
       '.lighthouseci/**',
@@ -20,6 +18,7 @@ module.exports = tseslint.config(
   },
   {
     files: ['**/*.ts'],
+    ignores: ['e2e/**/*.ts', 'playwright.config.ts'],
     extends: [
       eslint.configs.recommended,
       ...tseslint.configs.recommended,
@@ -49,5 +48,15 @@ module.exports = tseslint.config(
     files: ['**/*.html'],
     extends: [...angular.configs.templateRecommended, ...angular.configs.templateAccessibility],
   },
+  {
+    files: ['e2e/**/*.ts', 'playwright.config.ts'],
+    extends: [eslint.configs.recommended, ...tseslint.configs.recommended],
+    languageOptions: {
+      parserOptions: {
+        project: './tsconfig.e2e.json',
+        tsconfigRootDir: __dirname,
+      },
+    },
+  },
   prettier,
 );