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/tsconfig.node.json

@@ -4,7 +4,7 @@
     "target": "ES2023",
     "lib": ["ES2023"],
     "module": "ESNext",
-    "types": ["node"],
+    "types": ["node", "vitest/globals"],
     "skipLibCheck": true,
 
     /* Bundler mode */