feat: sign in sign up with all views

kittyurl-frontend/src/utils/crypto.ts

@@ -0,0 +1,7 @@
+// src/utils/crypto.ts
+export async function sha512(message: string): Promise<string> {
+    const msgUint8 = new TextEncoder().encode(message);
+    const hashBuffer = await crypto.subtle.digest('SHA-512', msgUint8);
+    const hashArray = Array.from(new Uint8Array(hashBuffer));
+    return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
+}