Add column filters to Missing Data view and include Classification in editable columns

src/App.tsx

@@ -115,6 +115,7 @@ export default function App() {
           const syncedData = await getAllSyncedRows(session?.access_token);
           
           const editableColumns = new Set([
+            COLUMNS.CLASSIFICATION,
             COLUMNS.LONG_DE, COLUMNS.LONG_EN, 
             COLUMNS.SHORT_DE, COLUMNS.SHORT_EN,
             COLUMNS.DETAILS_DE, COLUMNS.DETAILS_EN,