Collapse <select> elements to show only the selected (or first) option
text instead of rendering all options as visible block elements. Thread
letter-spacing through the full layout pipeline (CSS types → computed
styles → layout box → inline items → text measurement) so that
properties like `.cattitle { letter-spacing: 1px }` are recognized and
affect layout width.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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