feat(auth): add registration message for successful registration

src/pages/auth/Login.tsx

@@ -313,6 +313,13 @@ const STYLES = `
     display:flex;align-items:center;gap:0.5rem;
   }
 
+  .lg-success {
+    background:#f0fdf4;border:2px solid #bbf7d0;border-radius:14px;padding:0.8rem 1rem;
+    font-family:'Nunito Sans',sans-serif;font-size:0.82rem;font-weight:700;color:#15803d;
+    display:flex;align-items:center;gap:0.5rem;
+    animation: formPop 0.4s cubic-bezier(0.34,1.56,0.64,1) both;
+  }
+
   .lg-btn {
     width:100%;padding:1rem;background:#f97316;color:white;border:none;border-radius:100px;cursor:pointer;
     font-family:'Nunito',sans-serif;font-size:1rem;font-weight:900;
@@ -365,8 +372,14 @@ export const Login = () => {
   const navigate = useNavigate();
   const location = useLocation();
 
-  const { login, isAuthenticated, isLoading, error, clearError } =
-    useAuthStore();
+  const {
+    login,
+    isAuthenticated,
+    isLoading,
+    error,
+    clearError,
+    registrationMessage,
+  } = useAuthStore();
   const from =
     (location.state as LocationState)?.from?.pathname || "/student/home";
 
@@ -673,6 +686,12 @@ export const Login = () => {
               </label>
             </div>
 
+            {registrationMessage && (
+              <div className="lg-success">
+                <span>✅</span> {registrationMessage}
+              </div>
+            )}
+
             {error && (
               <div className="lg-error">
                 <span>⚠️</span> {error}