Refactor viewport host mock setup in tests

tests/unit/viewport-canvas.test.tsx

@@ -5,7 +5,22 @@ import { createEmptySceneDocument } from "../../src/document/scene-document";
 import { ViewportCanvas } from "../../src/viewport-three/ViewportCanvas";
 import type { CreationViewportToolPreview, ViewportToolPreview } from "../../src/viewport-three/viewport-transient-state";
 
-const viewportHostInstances: MockViewportHost[] = [];
+const { MockViewportHost, viewportHostInstances } = vi.hoisted(() => {
+  const viewportHostInstances: Array<{
+    mount: ReturnType<typeof vi.fn>;
+    dispose: ReturnType<typeof vi.fn>;
+    updateWorld: ReturnType<typeof vi.fn>;
+    updateAssets: ReturnType<typeof vi.fn>;
+    updateDocument: ReturnType<typeof vi.fn>;
+    setViewMode: ReturnType<typeof vi.fn>;
+    setDisplayMode: ReturnType<typeof vi.fn>;
+    setBrushSelectionChangeHandler: ReturnType<typeof vi.fn>;
+    setCreationPreviewChangeHandler: ReturnType<typeof vi.fn>;
+    setCreationCommitHandler: ReturnType<typeof vi.fn>;
+    setToolMode: ReturnType<typeof vi.fn>;
+    setCreationPreview: ReturnType<typeof vi.fn>;
+    focusSelection: ReturnType<typeof vi.fn>;
+  }> = [];
 
   class MockViewportHost {
     mount = vi.fn();
@@ -27,6 +42,12 @@ class MockViewportHost {
     }
   }
 
+  return {
+    MockViewportHost,
+    viewportHostInstances
+  };
+});
+
 vi.mock("../../src/viewport-three/viewport-host", () => ({
   ViewportHost: MockViewportHost
 }));