chore: fix various layout problems (#37983)

Fix various misaligments, fix space between list item bar items, remove
deadcode (milestone dashboard)

web_src/css/index.css

@@ -37,7 +37,6 @@
 @import "./modules/charescape.css";
 
 @import "./shared/flex-list.css";
-@import "./shared/milestone.css";
 @import "./shared/settings.css";
 
 @import "./features/dropzone.css";