fix(web): add min-width 0 to topbar pills so overflow-x auto activates

inline-flex defaults to min-width: auto, meaning the element always
expands to fit content and overflow-x: auto never triggers. Setting
min-width: 0 lets the parent constrain the container so scroll kicks
in when pills exceed available width.

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

packages/web/src/app/globals.css

@@ -7607,6 +7607,7 @@ html.light .xterm .xterm-viewport:hover::-webkit-scrollbar-thumb:active {
   align-items: center;
   gap: 4px;
   flex-wrap: nowrap;
+  min-width: 0;
   overflow-x: auto;
 }