Bring the two slotted topbar actions onto the design system so the bar
reads as one cohesive surface:
- SaveToJournalButton: primary Button primitive; "saved" uses the
accent, error uses a new --color-danger token, and the return link
gets secondary token styling.
- ExportButton: token split-button (secondary look, chevron icon,
single divider) and a token dropdown menu (raised surface, soft
shadow, muted descriptions).
- New --color-danger token (#a03c3c, the no-go hue at full strength)
for error text.
Behavior and i18n unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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