Fix test errors and missing imports

package.json

@@ -8,7 +8,7 @@
     "api": "tsx server/index.ts",
     "build": "tsc -b && vite build",
     "typecheck:server": "tsc -p tsconfig.server.json",
-    "test": "tsx --test packages/game-core/index.test.ts",
+    "test": "tsx --test packages/game-core/index.test.ts src/ui-format.test.ts",
     "preview": "vite preview --host"
   },
   "dependencies": {

packages/game-core/index.test.ts

@@ -1,14 +1,14 @@
 import assert from "node:assert/strict";
 import test from "node:test";
-import { createPuzzle, dailyGame, replay, simulateFlight } from "./index.js";
+import { createPuzzle, dailyGame, replay, simulateFlight, stackBlockX } from "./index.js";
 
 test("same seed creates the same puzzle", () => {
   assert.deepEqual(createPuzzle("reaction", "abc"), createPuzzle("reaction", "abc"));
   assert.notDeepEqual(createPuzzle("reaction", "abc"), createPuzzle("reaction", "def"));
 });
 
 test("daily rotation always selects a ranked challenge", () => {
-  const ranked = new Set(["reaction", "color", "whack", "flight", "pop", "memory"]);
+  const ranked = new Set(["reaction", "color", "whack", "flight", "pop", "memory", "stack"]);
   for (const day of ["2026-09-01", "2026-09-02", "2026-09-03", "2026-09-04", "2026-09-05"]) assert.equal(ranked.has(dailyGame(day)), true);
 });
 
@@ -99,16 +99,6 @@ test("flight: a bird that never flaps falls to the ground and cannot finish", ()
   assert.equal(noFlap.completed, false);
 });
 
-test("flight: a bird that never flaps falls to the ground and cannot finish", () => {
-  const idle = replay("flight", "seed-flight", [{ t: 8000, type: "key", value: "flap" }]);
-  assert.equal(idle.valid, true);
-  assert.equal(idle.completed, false);
-  assert.equal(idle.score, 0);
-  // Even a late flap cannot grant a passed pipe once the bird hits the floor.
-  const noFlap = replay("flight", "seed-flight", []);
-  assert.equal(noFlap.completed, false);
-});
-
 test("flight: live horizon verdict never projects a future ground death", () => {
   const puzzle = createPuzzle("flight", "seed-flight");
   if (puzzle.gameId !== "flight") return;