Upgrade dependencies (#479)

Migrate to latest versions of Next.js, React, Radix, etc.

eslint.config.mjs

@@ -0,0 +1,21 @@
+import nextVitals from 'eslint-config-next/core-web-vitals'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  // Override default ignores of eslint-config-next.
+  globalIgnores([
+    // Default ignores of eslint-config-next:
+    '.next/**',
+    'out/**',
+    'build/**',
+    'next-env.d.ts',
+  ]),
+  {
+    rules: {
+      'react-hooks/set-state-in-effect': 'off',
+    },
+  },
+])
+
+export default eslintConfig