fix: update admin page for passwordless authentication

- Remove handleResetPassword function (no longer needed with Magic Links)
- Change password reset button to send Magic Link instead
- Update button icon from KeyRound to Mail
- Update button tooltip to reflect new Magic Link flow
- Remove unused KeyRound import

frontend/src/app/admin/page.tsx

@@ -22,7 +22,6 @@ import {
   Shield,
   ShieldOff,
   Trash2,
-  KeyRound,
   Mail,
   RefreshCw,
   LogOut,
@@ -156,20 +155,6 @@ export default function AdminPage() {
     setActionLoading(null);
   };
 
-  const handleResetPassword = async (userId: number) => {
-    if (!confirm("Passwort zuruecksetzen? Der User erhaelt eine Email mit dem neuen Passwort.")) {
-      return;
-    }
-    setActionLoading(userId);
-    const { data, error } = await adminApi.resetPassword(userId);
-    if (error) {
-      setError(error);
-    } else {
-      showSuccess(data?.message || "Passwort zurueckgesetzt");
-    }
-    setActionLoading(null);
-  };
-
   const handleResendVerification = async (userId: number) => {
     setActionLoading(userId);
     const { data, error } = await adminApi.resendVerification(userId);
@@ -488,14 +473,14 @@ export default function AdminPage() {
                             </Button>
                           )}
 
-                          {/* Passwort zuruecksetzen */}
+                          {/* Login-Link erneut senden */}
                           <Button
                             variant="ghost"
                             size="sm"
-                            onClick={() => handleResetPassword(u.id)}
-                            title="Passwort zuruecksetzen"
+                            onClick={() => handleResendVerification(u.id)}
+                            title="Login-Link erneut senden"
                           >
-                            <KeyRound className="h-4 w-4" />
+                            <Mail className="h-4 w-4" />
                           </Button>
 
                           {/* Container loeschen */}