`/errors` showed the selected error in a FontString, so a player could not select or copy the message and traceback they came to report.
The detail pane now hosts a multi-line EditBox the way stock `MailFrame.xml` hosts the mail body:
- `autoFocus="false"`, so the keyboard stays with the game until a click;
- Escape clears focus;
- a mouse-enabled scroll child that focuses the box on a click below its text;
- `ScrollingEdit_OnTextChanged` for the range, since the box is as tall as its text.
The box is read-only: an edit is undone on `OnTextChanged`. Focus selects all, so Ctrl+C copies the whole error, and a new error arriving keeps the selection. The text keeps its font, its 6/6 inset and its 270 wrap.
Tests cover the whole text in the box, the undone edits, select-all and copy, a click below the text, Escape, and the range over a long traceback.
Fixes#703🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
