Let Rich handle word wrapping naturally instead of breaking lines
at fixed widths, which caused mid-word cuts in narrow panels.
Also use NoMatches instead of bare Exception in toggle handler.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Split each screen into two columns: existing controls on the left,
a DocsPanel with Rich-markup documentation on the right (30% width).
Press F1 to toggle the help panel on/off from any screen.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>