When minimized, automatically show the Action Items pane when Errors, Warnings, or Hints exist

### Description

When minimized, automatically show the Action Items pane when Errors, Warnings, or Hints exist.

Similar to how the Output pane pops out when a file is downloaded or uploaded.

This way, issues can become visible when needed, without the pane taking up space when empty.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Start by locating the minimized Action Items pane and the existing Output pane behavior for file downloads and uploads. Trace how Errors, Warnings, and Hints are detected and define the completed behavior as showing the pane only when those items exist, while keeping it minimized when empty; no specific file or test is named.

Written by the indexing model from the issue text.