fix: some improvements to electron app (#2089)

apps/electron/layers/main-events.ts

@@ -0,0 +1,5 @@
+// This file contains the main process events
+// It will guide preload and main process on the correct event types and payloads
+export interface MainEventMap {
+  'main:on-db-update': (workspaceId: string) => void;
+}