fix(ui): replace children cast to any with hono/jsx Child type

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

package.json

@@ -17,7 +17,7 @@
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
     "typecheck": "tsc --noEmit",
-    "prepare": "husky"
+    "prepare": "husky && npm run build:client"
   },
   "lint-staged": {
     "*.{ts,js}": [