chore: migrate from deprecated tseslint.config to ESLint defineConfig (#221)

* refactor: migrate from deprecated tseslint.config to ESLint defineConfig

- Replace deprecated typescript-eslint config helper with ESLint's native defineConfig
- Import defineConfig from 'eslint/config' as recommended by ESLint core
- Maintain existing configuration structure and rules

https://typescript-eslint.io/packages/typescript-eslint/#config-deprecated

eslint.config.js

@@ -3,9 +3,10 @@ import js from '@eslint/js'
 import pluginQuery from '@tanstack/eslint-plugin-query'
 import reactHooks from 'eslint-plugin-react-hooks'
 import reactRefresh from 'eslint-plugin-react-refresh'
+import { defineConfig } from 'eslint/config'
 import tseslint from 'typescript-eslint'
 
-export default tseslint.config(
+export default defineConfig(
   { ignores: ['dist', 'src/components/ui'] },
   {
     extends: [