fix(ui): make workflow runs page fill full width (#29868)

The Workflow Runs page rendered its table at roughly a quarter of the
available width. Its root container is a flex child of the dashboard
content row but set only padding, min-height and background, so with no
width it shrank to the table's natural content size. Sibling pages
(logs, memory) fill the area with a full-width root; mirror that by
setting width 100% on the container.

Fixes LIT-3636

ui/litellm-dashboard/src/components/workflow_runs/index.tsx

@@ -587,6 +587,7 @@ const WorkflowRuns: React.FC<WorkflowRunsProps> = ({ accessToken }) => {
   return (
     <div
       style={{
+        width: "100%",
         padding: "24px 32px",
         fontFamily: '-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif',
         minHeight: "calc(100vh - 64px)",