fix(01-02): resolve TypeScript build errors for production build

- Fix palette.test.ts: use type-only import for CategoryType (verbatimModuleSyntax)
- Fix vite.config.ts: import defineConfig from vitest/config for test property support
- Fix tsconfig.node.json: add vitest/globals to types array
- Fix AvailableBalance.tsx: split typed array and filter to preserve CategoryType literal

frontend/vite.config.ts

@@ -1,5 +1,4 @@
-/// <reference types="vitest" />
-import { defineConfig } from 'vite'
+import { defineConfig } from 'vitest/config'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
 import path from 'path'