fix: keep login screen visible until store refresh completes

src/App.js

@@ -494,13 +494,11 @@ function App() {
             });
           }
         }
+        finishSyncProgress();
       } catch (err) {
         console.warn('Konnte Session nicht wiederherstellen:', err);
-      } finally {
-        if (ticker) {
-          clearInterval(ticker);
-        }
         finishSyncProgress();
+      } finally {
         setInitializing(false);
       }
     })();
@@ -842,7 +840,16 @@ function App() {
     return (
       <>
         <div className="min-h-screen flex items-center justify-center bg-gray-100">
-          <form className="bg-white shadow-lg rounded-lg p-8 w-full max-w-md space-y-6" onSubmit={handleLogin}>
+          <form
+            className="bg-white shadow-lg rounded-lg p-8 w-full max-w-md space-y-6"
+            onSubmit={(e) => {
+              if (initializing) {
+                e.preventDefault();
+                return;
+              }
+              handleLogin(e);
+            }}
+          >
           <div>
             <h1 className="text-2xl font-bold mb-2 text-center text-gray-800">Pickup Config Login</h1>
             <p className="text-sm text-gray-500 text-center">
@@ -884,10 +891,10 @@ function App() {
           </div>
             <button
               type="submit"
-              disabled={loading}
+              disabled={loading || initializing}
               className="w-full bg-blue-500 hover:bg-blue-600 text-white px-4 py-2 rounded focus:outline-none focus:ring-2 focus:ring-blue-500 disabled:opacity-60"
             >
-              {loading ? 'Anmeldung läuft...' : 'Anmelden'}
+              {loading || initializing ? 'Anmeldung läuft...' : 'Anmelden'}
             </button>
           </form>
         </div>