Why: during a run nothing was rendered (the assistant message only lands
at completion, so the LiveState projection never hit the screen), and
white-space:pre-wrap on .part-text turned marked's inter-block newlines
into blank lines, giving ordered lists a huge per-item gap. A latent
race also wiped thinking/tool/phase state that arrived before the send
POST resolved, and thinking text ran inline with the answer.
Evidence: headless playwright against the mock backend shows the live
bar, an expanded thinking panel, tool chips and incremental text with a
blinking cursor mid-run; list item gaps measure 2.1px with
white-space:normal; make test (frontend 9 tests) green.
Impact: users watch thinking, tool calls and the answer stream in real
time; markdown typography (lists, tables, quotes, headings) is compact;
terminal runs fold the process trail behind a summary.
Refs: feature/chat-live-quality task card.
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