fix: pin TypeScript 5.9 until Next.js supports TS 7

Co-authored-by: Cursor <[email protected]>

tsconfig.json

@@ -18,6 +18,7 @@
 				"name": "next"
 			}
 		],
+		"baseUrl": ".",
 		"paths": {
 			"@/*": ["./src/*"]
 		}