fix(test): add missing pixi Graphics mock for transition tests

Made-with: Cursor

tests/kernel/transition-transaction.test.ts

@@ -26,8 +26,48 @@ class MockContainer {
   }
 }
 
+class MockGraphics extends MockContainer {
+  clear(): this {
+    return this;
+  }
+
+  rect(): this {
+    return this;
+  }
+
+  roundRect(): this {
+    return this;
+  }
+
+  fill(): this {
+    return this;
+  }
+
+  stroke(): this {
+    return this;
+  }
+}
+
+class MockText extends MockContainer {
+  text = "";
+  style: unknown;
+  anchor = {
+    set: () => {},
+  };
+  position = {
+    set: () => {},
+  };
+}
+
+class MockTextStyle {
+  constructor(_style?: Record<string, unknown>) {}
+}
+
 vi.mock("pixi.js", () => ({
   Container: MockContainer,
+  Graphics: MockGraphics,
+  Text: MockText,
+  TextStyle: MockTextStyle,
 }));
 
 vi.mock("@/core/Game", () => {