web-ui: hide spurious horizontal scrollbar on case documents list

The list's scroll container had only overflow-y:auto, which CSS computes
overflow-x to auto too. Combined with the row's -mx-2 hover-background
extension, this surfaced an unwanted horizontal scrollbar.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web-ui/src/components/cases/documents-panel.tsx

@@ -359,7 +359,7 @@ export function DocumentsPanel({
         </div>
       )}
 
-      <div className="max-h-[70vh] overflow-y-auto" dir="rtl">
+      <div className="max-h-[70vh] overflow-y-auto overflow-x-hidden" dir="rtl">
         <ul className="divide-y divide-rule" dir="rtl">
           {sorted.map((doc) => (
             <DocumentRow key={doc.id} doc={doc} caseNumber={caseNumber} />