WidgetText collapsed mode

[kazcw]

Pull Request Description

When a component is collapsed, any contained text widget:

• has a fixed maximum width
  • this width is increased when the widget is focused
  • long text can be scrolled with the cursor
• is displayed in a single line, with newline characters shown as a placeholder character
  • copying from the text will copy the real newlines, not the placeholder

Screen.Recording.2026-02-17.at.06.47.03.mov

Fixes #14625.

Important Notes

Checklist

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• The documentation has been updated, if necessary.
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• Unit tests have been written where possible.
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  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
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[farmaazon]

@kazcw could we also add a maximum width on Expanded WidgetText, with horizontal scrollbar if needed?

[kazcw]

@kazcw could we also add a maximum width on Expanded WidgetText, with horizontal scrollbar if needed?

Sure--I'm working on how widgets are sized in expanded mode right now in #14626, so I'll include that there

[farmaazon]

CR: 🆗