- Buttons: smaller default font (14px -> 13px) and tighter padding-driven sizes
across every variant; the chunky shadcn scale read as oversized in a dense
desktop UI.
- Overlay split layout (settings / command center): the shared OverlayView top
padding left the card surface showing as a gap above the sidebar. Move the
titlebar clearance into each column so the sidebar background runs flush to
the card's top edge.
- Consolidate buttons that hardcoded size/radius/font onto the proper size
variants (tooltip-icon-button, overlay close, cron IconAction, SidebarTrigger,
gateway system button, session-row actions radius, title chip radius, release
notes link) so styling flows from variant props, not per-call overrides.
Composer and the inline approval strip are intentionally left as-is.
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