fix: Final TypeScript fixes and dependencies

Signed-off-by: Hermes Agent <hermes@nosuchhost>

client/package.json

@@ -20,13 +20,17 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.10.0",
+    "@tailwindcss/postcss": "^4.3.1",
     "@types/node": "^25.9.3",
     "@types/react": "^18.3.9",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.3.1",
+    "autoprefixer": "^10.5.0",
     "eslint": "^9.10.0",
     "eslint-plugin-react-hooks": "^5.1.0",
     "eslint-plugin-react-refresh": "^0.4.12",
+    "postcss": "^8.5.15",
+    "tailwindcss": "^4.3.1",
     "typescript": "^5.6.2",
     "typescript-eslint": "^8.4.0",
     "vite": "^5.4.3"