Wire the unused --markdown-paragraph-spacing token to .markdown-content p so
adjacent paragraphs no longer collapse into a single visual line (Tailwind
preflight had zeroed the default <p> margins).
The renderer wraps each block in a display:contents [data-md-block] element, so
the message-level last-child margin nullifiers target the wrapper, not the
paragraph. Drop the trailing margin on the last paragraph of the last block
directly so messages don't gain extra bottom space. Keep tool-card and
reasoning markdown compact.
Bohdan Triapitsyn
08a851f902