fix(workspace): auto-set cwd when a lane is selected from the strip

Selecting a lane card only updated selectedLaneId, leaving the run-setup
cwd field on whatever it was before — now selecting a lane also syncs
cwd to that lane's own working directory.

client/src/pages/Workspace.tsx

@@ -894,7 +894,10 @@ export function Workspace() {
             key={l.id}
             lane={l}
             selected={selectedLaneId === l.id}
-            onSelect={() => setSelectedLaneId(l.id)}
+            onSelect={() => {
+              setSelectedLaneId(l.id);
+              setCwd(l.cwd);
+            }}
           />
         ))}
         {!lanes.length && (