fix(app): keep update progress visible on the welcome screen (#951)

Check for Updates on the welcome screen showed nothing while the request was out: the check ran only as a status-bar task, and the welcome screen has no status bar. Leaving a project also dropped every notification, including a running update download.

A check started with no project or LightEdit window open now shows its progress in a balloon (keyed like the result, so the result replaces it); project windows keep it in the status bar. A project switch clears only project notifications and keeps the app-wide update ones.

Co-authored-by: youngtseup <[email protected]>

src/workbench/notificationStore.ts

@@ -175,6 +175,11 @@ export function clearNotifications() {
   useNotifications.setState({ items: [] });
 }
 
+/** A project switch drops the previous project's notifications; app-wide ones (updates) stay. */
+export function clearProjectNotifications() {
+  useNotifications.setState((s) => ({ items: s.items.filter((x) => x.group === "updates") }));
+}
+
 /** The list was seen: everything is read and no longer shown as a balloon. */
 export function markAllNotificationsRead() {
   useNotifications.setState((s) => ({