Add setGridVisible to MockViewportHost and update tests

tests/unit/viewport-canvas.test.tsx

@@ -27,6 +27,7 @@ const { MockViewportHost, viewportHostInstances } = vi.hoisted(() => {
     setWhiteboxHoverLabelChangeHandler: ReturnType<typeof vi.fn>;
     setWhiteboxSelectionMode: ReturnType<typeof vi.fn>;
     setWhiteboxSnapSettings: ReturnType<typeof vi.fn>;
+    setGridVisible: ReturnType<typeof vi.fn>;
     setToolMode: ReturnType<typeof vi.fn>;
     setCreationPreview: ReturnType<typeof vi.fn>;
     setTransformSession: ReturnType<typeof vi.fn>;
@@ -53,6 +54,7 @@ const { MockViewportHost, viewportHostInstances } = vi.hoisted(() => {
     setWhiteboxHoverLabelChangeHandler = vi.fn();
     setWhiteboxSelectionMode = vi.fn();
     setWhiteboxSnapSettings = vi.fn();
+    setGridVisible = vi.fn();
     setToolMode = vi.fn();
     setCreationPreview = vi.fn();
     setTransformSession = vi.fn();
@@ -114,6 +116,7 @@ describe("ViewportCanvas", () => {
         whiteboxSelectionMode="object"
         whiteboxSnapEnabled
         whiteboxSnapStep={1}
+        viewportGridVisible
         selection={{ kind: "none" }}
         toolMode="create"
         toolPreview={toolPreview}
@@ -164,6 +167,7 @@ describe("ViewportCanvas", () => {
         whiteboxSelectionMode="object"
         whiteboxSnapEnabled
         whiteboxSnapStep={1}
+        viewportGridVisible
         selection={{ kind: "none" }}
         toolMode="select"
         toolPreview={{ kind: "none" }}