Add close buttons to modals

Since dialogs are going to be re thought out then an option to consider would be to add a close button for mouse users

I've attached an image of the old DOS Borland Turbo C IDE as an example, it has the green box in the dialog and editor frames as a "Close" button.


Placement and symbol could of course be different but it would be a way to make mouse interaction more complete, but I also get that this is a TUI and the command line keyboard user is a major target

No files, tests, or entry points are named. Start by locating the current dialog and modal implementation, then review how mouse interaction is handled; done means dialogs and editor frames provide a usable close button without undermining keyboard interaction.

Written by the indexing model from the issue text.