Markdown quotes no longer break attributes; Tailwind inlines for Section/Column/Row

Patch Changes

• 6a5ff2a: Escape double quotes in Markdown link href/title and image title attributes, matching the escaping already applied to image src/alt. A markdown title like 'The "Complete" Guide' no longer breaks out of the attribute in the rendered HTML.
• 4cf4c72: Fix two-value logical shorthands whose values aren't all numeric (e.g. margin-inline: 1rem auto, padding-inline: 10px calc(1rem + 2px)) producing invalid duplicated longhands. They are now split into the correct per-side declarations.
• fa77d55: Merge declarations when the same class is defined by multiple Tailwind rules (e.g. a preset and a child config override).
• fa52a04: Convert Tailwind's rgba(r g b / a) syntax to rgb(r,g,b,a) syntax for better email client support.
• fc8318c: Fix Tailwind classes not being inlined into styles for <Section>, <Column> and <Row>.