ui/phase-14: rename planet end-to-end + order read-back

Wires the first end-to-end command through the full pipeline:
inspector rename action → local order draft → user.games.order
submit → optimistic overlay on map / inspector → server hydration
on cache miss via the new user.games.order.get message type.

Backend: GET /api/v1/user/games/{id}/orders forwards to engine
GET /api/v1/order. Gateway parses the engine PUT response into the
extended UserGamesOrderResponse FBS envelope and adds
executeUserGamesOrderGet for the read-back path. Frontend ports
ValidateTypeName to TS, lands the inline rename editor + Submit
button, and exposes a renderedReport context so consumers see the
overlay-applied snapshot.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/internal/engineclient/client_test.go

@@ -195,6 +195,68 @@ func TestClientReportsForwardsQuery(t *testing.T) {
 	}
 }
 
+func TestClientGetOrderForwardsQuery(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != pathPlayerOrder {
+			t.Fatalf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Method != http.MethodGet {
+			t.Fatalf("unexpected method: %s", r.Method)
+		}
+		if r.URL.Query().Get("player") != "alpha" {
+			t.Fatalf("player = %q", r.URL.Query().Get("player"))
+		}
+		if r.URL.Query().Get("turn") != "3" {
+			t.Fatalf("turn = %q", r.URL.Query().Get("turn"))
+		}
+		_, _ = w.Write([]byte(`{"game_id":"abc","updatedAt":99,"cmd":[]}`))
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.GetOrder(context.Background(), srv.URL, "alpha", 3)
+	if err != nil {
+		t.Fatalf("GetOrder: %v", err)
+	}
+	if status != http.StatusOK {
+		t.Fatalf("status = %d", status)
+	}
+	if !strings.Contains(string(body), `"updatedAt":99`) {
+		t.Fatalf("body = %s", body)
+	}
+}
+
+func TestClientGetOrderNoContent(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.GetOrder(context.Background(), srv.URL, "alpha", 3)
+	if err != nil {
+		t.Fatalf("GetOrder: %v", err)
+	}
+	if status != http.StatusNoContent {
+		t.Fatalf("status = %d", status)
+	}
+	if body != nil {
+		t.Fatalf("expected nil body on 204, got %s", body)
+	}
+}
+
+func TestClientGetOrderRejectsBadInput(t *testing.T) {
+	cli := newTestClient(t, httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("server must not be hit on bad input")
+	})))
+	if _, _, err := cli.GetOrder(context.Background(), "http://example.com", "", 0); err == nil {
+		t.Fatal("expected error on empty race name")
+	}
+	if _, _, err := cli.GetOrder(context.Background(), "http://example.com", "alpha", -1); err == nil {
+		t.Fatal("expected error on negative turn")
+	}
+}
+
 func TestClientHealthzSuccess(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path != pathHealthz {