fix: enforce pnpm as package manager & Husky setup

- Set up Husky for pre-commit hooks
- Clear npm cache and remove node_modules
- Update package.json to specify preferred package manager
- Add lint-staged to enforce linting and formatting on commit
- Ensure consistent code formatting with Prettier

.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged

.prettierignore

@@ -0,0 +1,2 @@
+node_modules/
+.next/

.prettierrc.yml

@@ -0,0 +1,5 @@
+trailingComma: 'es5'
+tabWidth: 2
+semi: true
+singleQuote: true
+bracketSpacing: true

eslint.config.mjs

@@ -0,0 +1,15 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+export default [
+  ...compat.extends('next/core-web-vitals', 'next/typescript', 'prettier'),
+];