fix(ui): improve mobile layout for assignee/project selectors in new issue dialog

Allow the "For [Assignee] in [Project]" row to wrap on mobile instead of
requiring horizontal scroll that pushes selectors off-screen. On desktop
(sm+), the row stays inline with min-w-max. Added overscroll-x-contain
for better touch scroll containment.

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

ui/src/components/NewIssueDialog.tsx

@@ -641,8 +641,8 @@ export function NewIssueDialog() {
         </div>
 
         <div className="px-4 pb-2 shrink-0">
-          <div className="overflow-x-auto">
-            <div className="inline-flex min-w-max items-center gap-2 text-sm text-muted-foreground">
+          <div className="overflow-x-auto overscroll-x-contain">
+            <div className="inline-flex items-center gap-2 text-sm text-muted-foreground flex-wrap sm:flex-nowrap sm:min-w-max">
               <span>For</span>
               <InlineEntitySelector
                 ref={assigneeSelectorRef}