feat: implement auth state management with RouteGuards

frontend/src/components/SplashScreen.tsx

@@ -0,0 +1,17 @@
+import Logo from "./Logo";
+
+export default function SplashScreen() {
+  return (
+    <div className="fixed inset-0 bg-base-100 flex flex-col items-center justify-center z-9999">
+      <div className="flex flex-col items-center gap-6 animate-pulse">
+        <Logo />
+        <div className="flex flex-col items-center gap-2">
+          <span className="loading loading-ring loading-lg text-primary" />
+          <p className="text-xs uppercase tracking-widest opacity-40 font-display">
+            Initializing Identity
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}