remove margins on lists and reset line height to 160% (#10573)

* remove margins on lists and reset line height to 160%

* Simplify list paragraph margin fix using :not(li) selector

Replace the override rule with a narrower selector on the existing rule,
fixing the root cause rather than patching over it with a compensating declaration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: rosieyohannan

ui/src/css/doc.css

@@ -1415,7 +1415,7 @@
 
 
 /* paragraphs, lists, tables, blockquotes all get 16px bottom spacing */
-.doc p,
+.doc :not(li) > p,
 .doc blockquote,
 .doc ul,
 .doc ol,

ui/src/css/vars.css

@@ -212,7 +212,7 @@
   --monospace-font-family: "IBM Plex Mono", monospace;
   --monospace-font-weight-bold: 600;
   --doc-font-size: 16px;
-  --doc-line-height: 1.7;
+  --doc-line-height: 1.6;
   --heading-font-weight: 500;
   --alt-heading-font-weight: 500;
   --toc-line-height: 1.2;