fix(backup): confirm legacy macOS destinations before manual runs

apps/desktop/src/lib/backend/api.ts

@@ -457,6 +457,7 @@ export const beginDatabaseBackupSnapshot = forward("beginDatabaseBackupSnapshot"
 export const exportDatabaseSql = forward("exportDatabaseSql");
 export const cancelDatabaseExport = forward("cancelDatabaseExport");
 export const clearDatabaseExportCancellation = forward("clearDatabaseExportCancellation");
+export const databaseExportDestinationNeedsConfirmation = forward("databaseExportDestinationNeedsConfirmation");
 export const recordDatabaseExportDestination = forward("recordDatabaseExportDestination");
 export const exportQueryResultCsv = forward("exportQueryResultCsv");
 export const exportTableDataCsv = forward("exportTableDataCsv");

apps/desktop/src/lib/backend/http.ts

@@ -2480,6 +2480,10 @@ export async function clearDatabaseExportCancellation(_exportId: string): Promis
   // The web exporter owns and clears its cancellation marker on completion.
 }
 
+export async function databaseExportDestinationNeedsConfirmation(_directory: string): Promise<boolean> {
+  throw new Error("Scheduled database backups are only available in the desktop app.");
+}
+
 export async function recordDatabaseExportDestination(_directory: string): Promise<void> {
   throw new Error("Scheduled database backups are only available in the desktop app.");
 }

apps/desktop/src/lib/backend/tauri.ts

@@ -5055,6 +5055,10 @@ export async function clearDatabaseExportCancellation(exportId: string): Promise
   await invoke("clear_database_export_cancellation", { exportId });
 }
 
+export async function databaseExportDestinationNeedsConfirmation(directory: string): Promise<boolean> {
+  return invoke("database_export_destination_needs_confirmation", { directory });
+}
+
 export async function recordDatabaseExportDestination(directory: string): Promise<void> {
   await invoke("record_database_export_destination", { directory });
 }