RuleDiamond draws the rule-diamond-rule of Heading, Dialog, Result, Card
titles and the ornament Divider; Frame draws the inset line with corner
diamonds of Card and decorated Dialog. Both snap the diamonds, and the
rule's diamond sits on the pixel-aligned line.
Snapshots: card (all densities, light and dark) moves the title rule's
diamond onto the rule's pixel row, an 8x8 region. Decorated dialog
(both densities, light and dark) loses the surface-colored halo under
each corner diamond, so the frame line now runs into the diamond as on
Card and the panel border is no longer notched at the corners.
Heading, Divider and Result render unchanged.
datetimeIconButton moves to icon_button.go as iconAction(c, icon, label)
and replaces the identical copies in Dialog close, PasswordInput toggle
and AppShell collapse. Hover and press now set Text on every caller,
including the date and time pickers, which kept TextMuted on hover.
Image retry (bordered, danger ink), TagsInput remove (14 DIP icon, no
press state) and Tag close (12 DIP icon, fade) are different buttons
and stay as they are.
ZacharyZhang-NY