- Background color toolbar button next to text color, using the
BackgroundColor extension from @tiptap/extension-text-style (same
textStyle-mark pattern as Color) with a 2x8 soft-tint highlighter
palette and a remove action; emitted as inline
style="background-color: …" which survives email round-trips.
- Font-size button now shows a big-A/small-A glyph (ALargeSmall) with
the active size as a small badge, replacing the plain "Aa" text that
was easy to miss.
- background_color/remove_background_color toolbar labels in all 24
locales; unit tests for apply/unset/parse/coexistence with color and
font-size on the same span.
Co-Authored-By: Claude <noreply@anthropic.com>