fix all eslint errors

frontend/.eslint.cjs

@@ -0,0 +1,104 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true,
+    },
+    project: './tsconfig.json', // Required for type-aware rules
+  },
+  env: {
+    browser: true,
+    es2021: true,
+    node: true,
+  },
+  plugins: [
+    'react',
+    'react-hooks',
+    '@typescript-eslint',
+    'jsx-a11y',
+    'import',
+    'unused-imports',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:react/recommended',
+    'plugin:react-hooks/recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+    'plugin:jsx-a11y/recommended',
+    'plugin:import/errors',
+    'plugin:import/warnings',
+    'plugin:import/typescript',
+    'prettier',
+  ],
+  rules: {
+    '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+    '@typescript-eslint/no-explicit-any': 'error',
+    '@typescript-eslint/explicit-function-return-type': ['error', { allowExpressions: false }],
+    '@typescript-eslint/strict-boolean-expressions': 'error',
+    '@typescript-eslint/no-floating-promises': 'error',
+    '@typescript-eslint/consistent-type-imports': ['error', { prefer: 'type-imports' }],
+    '@typescript-eslint/no-misused-promises': 'error',
+    '@typescript-eslint/prefer-readonly': 'error',
+    '@typescript-eslint/explicit-module-boundary-types': 'error',
+    '@typescript-eslint/typedef': [
+      'error',
+      {
+        arrayDestructuring: true,
+        arrowParameter: true,
+        memberVariableDeclaration: true,
+        objectDestructuring: true,
+        parameter: true,
+        propertyDeclaration: true,
+        variableDeclaration: true,
+        variableDeclarationIgnoreFunction: false,
+      },
+    ],
+
+    'react/react-in-jsx-scope': 'off', 
+    'react/prop-types': 'off', 
+    'react/jsx-uses-react': 'off',
+    'react/jsx-uses-vars': 'error',
+    'react/jsx-no-useless-fragment': 'error',
+    'react/self-closing-comp': 'error',
+
+    'react-hooks/rules-of-hooks': 'error',
+    'react-hooks/exhaustive-deps': 'error',
+
+    'jsx-a11y/no-noninteractive-element-interactions': 'error',
+    'jsx-a11y/anchor-is-valid': 'error',
+    'jsx-a11y/click-events-have-key-events': 'error',
+
+    'import/order': [
+      'error',
+      {
+        groups: [['builtin', 'external'], ['internal', 'parent', 'sibling', 'index']],
+        'newlines-between': 'always',
+        alphabetize: { order: 'asc', caseInsensitive: true },
+      },
+    ],
+    'import/no-unresolved': 'error',
+    'import/no-duplicates': 'error',
+
+    'unused-imports/no-unused-imports-ts': 'error',
+    'no-console': ['warn', { allow: ['warn', 'error'] }],
+    'no-debugger': 'error',
+    'eqeqeq': ['error', 'always'],
+    'curly': 'error',
+    'semi': ['error', 'always'],
+    'quotes': ['error', 'single', { avoidEscape: true }],
+    'prefer-const': 'error',
+    'no-var': 'error',
+  },
+  settings: {
+    react: {
+      version: 'detect',
+    },
+    'import/resolver': {
+      typescript: {},
+    },
+  },
+};