On platforms where scrollbars take layout space (macOS with a mouse or
'always show', Windows, Linux), the global 'scrollbar-width: thin'
reserves ~11px on the right edge of the issue detail scroll container
only, so the centered max-w-4xl column reads 32px left vs 43px right
whitespace. Mirror the gutter with 'scrollbar-gutter: stable both-edges'
on the detail scroller and its loading skeleton; overlay-scrollbar
platforms reserve nothing and are unchanged.
Measured before: 32px / 43px. After: 43px / 43px.
Co-authored-by: Lambda <lambda@multica.ai>
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