fix: clean undefined values before posting form

apps/client/app/utils/object.ts

@@ -0,0 +1,14 @@
+export function deepClean<T>(obj: T): T {
+	if (Array.isArray(obj)) {
+		return obj.map(deepClean).filter((v) => v !== undefined && v !== null) as T;
+	}
+
+	if (obj && typeof obj === "object") {
+		return Object.entries(obj).reduce((acc, [key, value]) => {
+			const cleaned = deepClean(value);
+			if (cleaned !== undefined) acc[key as keyof T] = cleaned;
+			return acc;
+		}, {} as T);
+	}
+	return obj;
+}