Added streak counter

src/lib/utils/streak.ts

@@ -0,0 +1,7 @@
+export async function fetchStreak(anonymousId: string, localDate: string): Promise<number> {
+	const params = new URLSearchParams({ anonymousId, localDate });
+	const res = await fetch(`/api/streak?${params}`);
+	if (!res.ok) return 0;
+	const data = await res.json();
+	return typeof data.streak === 'number' ? data.streak : 0;
+}