feat(lanes): show Add Lane auto-setup summary before closing modal

The three setup calls (profile/agents/mcp) fired after worktree
creation but their outcome was only logged to the console. Keep the
modal open with a ✓/✗ summary for a few seconds (or until dismissed)
so the user actually sees what happened, matching the original F5 design.

client/src/components/lanes/AddLaneModal.tsx

@@ -58,6 +58,25 @@ export function AddLaneModal({
     setSetupResult(null);
   };
 
+  // The setup summary (below) is shown for a few seconds before the modal
+  // auto-closes, so the user actually sees whether profile/agents/mcp
+  // succeeded instead of the modal vanishing the instant the lane exists.
+  const closeTimerRef = useRef<number | null>(null);
+  const finishAndClose = useCallback(() => {
+    if (closeTimerRef.current !== null) {
+      window.clearTimeout(closeTimerRef.current);
+      closeTimerRef.current = null;
+    }
+    reset();
+    onClose();
+  }, [onClose]);
+  useEffect(
+    () => () => {
+      if (closeTimerRef.current !== null) window.clearTimeout(closeTimerRef.current);
+    },
+    []
+  );
+
   // Look up the repo's branches once the path settles - debounced so every
   // keystroke while typing a path doesn't fire a request against a path that
   // isn't finished yet.
@@ -128,9 +147,9 @@ export function AddLaneModal({
         });
       }
 
-      reset();
+      setBusy(false);
       onAdded(result.lane);
-      onClose();
+      closeTimerRef.current = window.setTimeout(finishAndClose, 3000);
     } catch (err) {
       setError(err instanceof Error ? err.message : String(err));
       setBusy(false);
@@ -144,9 +163,8 @@ export function AddLaneModal({
   // into after the very first character. useCallback keeps the identity stable
   // across renders so only mount/unmount (and a real onClose change) refocuses.
   const handleCancel = useCallback(() => {
-    reset();
-    onClose();
-  }, [onClose]);
+    finishAndClose();
+  }, [finishAndClose]);
 
   return (
     <ConfirmModal
@@ -156,7 +174,7 @@ export function AddLaneModal({
       cancelLabel={t("destructive.cancel")}
       destructive={false}
       busy={busy}
-      disabled={!sourceRepo.trim() || !title.trim() || !branches}
+      disabled={!!setupResult || !sourceRepo.trim() || !title.trim() || !branches}
       onConfirm={submit}
       onCancel={handleCancel}
     >
@@ -214,6 +232,38 @@ export function AddLaneModal({
           <p className="text-[10px] text-status-warning">{branchesError}</p>
         )}
 
+        {setupResult && (
+          <div className="rounded-md border border-border-light bg-surface-0 p-2 space-y-1">
+            <p className="text-[10px] font-medium text-fg-secondary">{t("addLaneSetupTitle")}</p>
+            {(
+              [
+                {
+                  label: t("addLaneSetupProfile"),
+                  ok: setupResult.profile !== "failed",
+                  skipped: setupResult.profile === "skipped",
+                },
+                { label: t("addLaneSetupAgents"), ok: setupResult.agents === "ok" },
+                { label: t("addLaneSetupMcp"), ok: setupResult.mcp === "ok" },
+              ] as const
+            ).map((row) => (
+              <p key={row.label} className="flex items-center gap-1.5 text-[11px] text-fg-primary">
+                <span
+                  className={
+                    "skipped" in row && row.skipped
+                      ? "text-fg-muted"
+                      : row.ok
+                        ? "text-status-success"
+                        : "text-status-danger"
+                  }
+                >
+                  {"skipped" in row && row.skipped ? "–" : row.ok ? "✓" : "✗"}
+                </span>
+                {row.label}
+              </p>
+            ))}
+          </div>
+        )}
+
         {error && (
           <p role="alert" className="text-xs text-status-danger">
             {error}