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.

vite-lit-element-starter/src/starter.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, test } from "vitest";
+import "./my-element";
+
+describe("Vite Lit Element Starter", () => {
+  test("registers my-element custom element successfully", () => {
+    expect(customElements.get("my-element")).toBeDefined();
+  });
+
+  test("mounts starter element successfully", 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();
+  });
+});