fix(lit-components): fix rendering and interaction issues in force-graph, html-table, and draggable-dom

- lit-force-graph: Refactored for instance reuse, better lifecycle management, and added dynamic imports for AR/VR modes.
- lit-html-table: Improved visual design, readability of headers, and fixed reactivity in editable mode.
- lit-draggable-dom: Fixed clipping issues by switching to relative/absolute positioning and resolved a panning speed bug caused by CSS variable inheritance.

lit-components/lit-starter-ts/starter.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, test } from "vitest";
+import "./my-element";
+
+describe("MyElement Component", () => {
+  test("registers my-element custom element successfully", () => {
+    expect(customElements.get("my-element")).toBeDefined();
+  });
+
+  test("mounts and renders with default properties", async () => {
+    document.body.innerHTML = "<my-element></my-element>";
+    await window.happyDOM.whenAsyncComplete();
+
+    const element = document.body.querySelector("my-element");
+    expect(element).toBeDefined();
+    expect(element?.shadowRoot).toBeDefined();
+
+    const h1 = element?.shadowRoot?.querySelector("h1");
+    expect(h1?.textContent).toBe("Hello, World!");
+
+    const button = element?.shadowRoot?.querySelector("button");
+    expect(button?.textContent?.trim()).toBe("Click Count: 1");
+  });
+
+  test("handles name property change", async () => {
+    document.body.innerHTML = "<my-element name=\"Vitest\"></my-element>";
+    await window.happyDOM.whenAsyncComplete();
+
+    const element = document.body.querySelector("my-element");
+    const h1 = element?.shadowRoot?.querySelector("h1");
+    expect(h1?.textContent).toBe("Hello, Vitest!");
+  });
+
+  test("increments count on click and dispatches event", async () => {
+    document.body.innerHTML = "<my-element></my-element>";
+    await window.happyDOM.whenAsyncComplete();
+
+    const element = document.body.querySelector("my-element");
+    const button = element?.shadowRoot?.querySelector("button");
+
+    let eventDetail: number | null = null;
+    element?.addEventListener("count", (e: any) => {
+      eventDetail = e.detail;
+    });
+
+    button?.click();
+    await window.happyDOM.whenAsyncComplete();
+
+    expect(element?.count).toBe(2);
+    expect(button?.textContent?.trim()).toBe("Click Count: 2");
+    expect(eventDetail).toBe(2);
+  });
+});