Add Hard Refresh button to TopBar

Button triggers reload of all data from Dropbox source

src/App.tsx

@@ -36,6 +36,7 @@ export default function App() {
   const [rowStatuses, setRowStatuses] = useState<Record<string, string>>({});
   const [pendingRows, setPendingRows] = useState<Record<string, { rowIndex: number; originalData: ExcelRow; newData: ExcelRow; articleName: string }>>({});
   const [isSavingAll, setIsSavingAll] = useState(false);
+  const [refreshTrigger, setRefreshTrigger] = useState(0);
 
   useEffect(() => {
     console.log('[App] session changed:', session ? 'logged in' : 'logged out');
@@ -204,7 +205,7 @@ export default function App() {
     };
 
     if (session) loadDefaultData();
-  }, [session]);
+  }, [session, refreshTrigger]);
 
   const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
     const file = e.target.files?.[0];
@@ -475,6 +476,7 @@ export default function App() {
         stats={stats}
         activeModule={activeModule}
         onExport={handleExport}
+        onRefresh={() => { setRefreshTrigger(t => t + 1); }}
         hasData={appState.data.length > 0}
         hasUnsavedChanges={appState.hasUnsavedChanges}
         userEmail={session.user.email}