Refactor ESLint configuration and update lint scripts

- Reorganized `eslint.config.mjs` imports for clarity and consistency.
- Simplified eslint ignores by standardizing patterns and removing redundant file extensions.
- Updated lint scripts in `package.json` to use `eslint` directly, replacing `next lint`.

frontend/eslint.config.mjs

@@ -1,27 +1,28 @@
-import { dirname } from "path";
-import { fileURLToPath } from "url";
-import { FlatCompat } from "@eslint/eslintrc";
+import { FlatCompat } from '@eslint/eslintrc';
+import path from 'path';
+import { fileURLToPath } from 'url';
 
 const __filename = fileURLToPath(import.meta.url);
-const __dirname = dirname(__filename);
+const __dirname = path.dirname(__filename);
 
 const compat = new FlatCompat({
   baseDirectory: __dirname,
 });
 
-const eslintConfig = [
-  ...compat.extends("next/core-web-vitals", "next/typescript"),
+export default [
+  ...compat.extends('next/core-web-vitals'),
+  ...compat.extends('next/typescript'),
   {
     ignores: [
-      "**/node_modules/**",
-      "**/.next/**",
-      "**/out/**",
-      "**/build/**",
-      "**/dist/**",
-      "**/coverage/**",
-      "**/src/lib/api/generated/**",
-      "**/*.gen.ts",
-      "**/*.gen.tsx",
+      'node_modules/**',
+      '.next/**',
+      'out/**',
+      'build/**',
+      'dist/**',
+      'coverage/**',
+      'src/lib/api/generated/**',
+      '*.gen.ts',
+      '*.gen.tsx',
     ],
   },
   {
@@ -30,15 +31,19 @@ const eslintConfig = [
       // Components/hooks must use useAuth() from AuthContext, not useAuthStore directly
       // This ensures testability via DI (E2E mocks, unit test props)
       // Exception: Non-React contexts (client.ts) use dynamic import + __TEST_AUTH_STORE__ check
-      "no-restricted-imports": ["error", {
-        "patterns": [{
-          "group": ["**/stores/authStore"],
-          "importNames": ["useAuthStore"],
-          "message": "Import useAuth from '@/lib/auth/AuthContext' instead. Direct authStore imports bypass dependency injection and break test mocking."
-        }]
-      }]
-    }
-  }
+      'no-restricted-imports': [
+        'error',
+        {
+          patterns: [
+            {
+              group: ['**/stores/authStore'],
+              importNames: ['useAuthStore'],
+              message:
+                "Import useAuth from '@/lib/auth/AuthContext' instead. Direct authStore imports bypass dependency injection and break test mocking.",
+            },
+          ],
+        },
+      ],
+    },
+  },
 ];
-
-export default eslintConfig;

frontend/package.json

@@ -6,8 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "next lint",
-    "lint:fix": "next lint --fix",
+    "lint": "eslint .",
+    "lint:fix": "eslint --fix .",
     "lint:tests": "eslint tests --max-warnings=0",
     "type-check": "tsc --noEmit",
     "format": "prettier --write \"src/**/*.{ts,tsx,js,jsx,json,css,md}\"",
@@ -61,7 +61,6 @@
     "zustand": "^4.5.7"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3",
     "@hey-api/openapi-ts": "^0.86.11",
     "@next/bundle-analyzer": "^16.0.1",
     "@peculiar/webcrypto": "^1.5.0",