chore: Update TypeScript configuration to enable composite projects, generate declaration files, and include vitest.config.ts for improved type checking and module management.

frontend/tsconfig.node.json

@@ -4,13 +4,16 @@
     "lib": ["ES2023"],
     "module": "ESNext",
     "skipLibCheck": true,
+    "composite": true,
 
     /* Bundler mode */
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
     "isolatedModules": true,
     "moduleDetection": "force",
-    "noEmit": true,
+    "noEmit": false,
+    "declaration": true,
+    "declarationMap": true,
 
     /* Linting */
     "strict": true,
@@ -19,6 +22,6 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true
   },
-  "include": ["vite.config.ts"]
+  "include": ["vite.config.ts", "vitest.config.ts"]
 }