Yoga's default flexShrink: 1 was letting the MiniLogo and tab pills
shrink when the header row's collective content exceeded the
terminal width — driving FUSION onto a second line. Pin every
fixed-content header child (logo, dividers, tab pills, help-hint) to
flexShrink={0}; the trailing flexGrow filler still absorbs slack.
Belt-and-suspenders: wrap="truncate-end" on FUSION so any future
constraint truncates instead of wrapping.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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