fix(workspace): stop the pipeline map from overflowing the detail panel

The lane-detail section is a flex-1 row item next to the lane list, but
lacked min-w-0. A flex item's intrinsic min-width defaults to its
content size, so PipelineMap's 16-node row (which relies on flex-1
min-w-0 truncate per node to shrink) pushed the whole panel wider than
its allotted space instead of compressing, spilling nodes off-screen.

client/src/pages/Workspace.tsx

@@ -537,7 +537,10 @@ export function Workspace() {
         {/* The selected lane's pipeline — the thing you actually come to this
             page to read, beside the list rather than stacked under it. */}
         {currentLane && (
-          <section data-testid="lane-detail" className="flex min-h-0 flex-1 flex-col card p-4">
+          <section
+            data-testid="lane-detail"
+            className="flex min-h-0 min-w-0 flex-1 flex-col card p-4"
+          >
             <div className="mb-3 flex flex-wrap items-center justify-between gap-2">
               <span className="truncate text-sm font-semibold text-fg-primary">
                 {tLanes("laneHeader", {