fix(notifications): show close button after progress notification completes

[SpencerJung]

Related Issue

Closes #314963

Summary

After a progress notification completes (progress.done() is called), the notification's hasProgress getter still returned true because _progress was never nulled out. This caused three broken behaviors:

1. The close (×) button was hidden on the notification row
2. The "Clear All Notifications" button was disabled
3. The notifications.clearAll command silently skipped the notification

Changes

• notifications.ts: Fixed hasProgress getter to check !!this._progress && !this._progress.state.done (matching the existing sticky getter logic)
• notificationsViewer.ts: Added this.setInput(notification) call on PROGRESS content change events so the toolbar actions (including close button visibility) are re-rendered when progress completes

Verification Evidence

• npm run compile-check-ts-native: PASSED (no TypeScript errors)

Checklist

• Base branch is main
• No unauthorized version bump
• All feasible verification checks attempted
• No unintended schema or lockfile changes

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates notification progress handling so completed progress is no longer treated as active, and ensures the notification viewer refreshes state when progress changes.

Changes:

• Treats notifications with progress.state.done === true as not having active progress.
• Triggers a viewer input refresh when progress content changes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/vs/workbench/common/notifications.ts	Refines hasProgress to exclude completed progress states.
src/vs/workbench/browser/parts/notifications/notificationsViewer.ts	Refreshes rendered notification input when progress updates occur.

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