fix(web): use overflow-x auto on topbar pills to avoid silent clipping

overflow: hidden silently clips pills at intermediate viewport widths.
Switching to overflow-x: auto keeps all pills reachable via scroll
while still preventing vertical stacking.

Closes #1920

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

packages/web/src/app/globals.css

@@ -7607,7 +7607,7 @@ html.light .xterm .xterm-viewport:hover::-webkit-scrollbar-thumb:active {
   align-items: center;
   gap: 4px;
   flex-wrap: nowrap;
-  overflow: hidden;
+  overflow-x: auto;
 }
 
 /* Project name + pills: inline on desktop, stacked column on mobile */