Add comprehensive dispose() tests and update docs

Introduces a new test suite for the dispose() method covering all major classes, including event unbinding, DOM cleanup, and resource disposal. Updates documentation for Shape.dispose() in both code and type definitions for clarity. Ensures dispose.js is included in test runners.

Author: jonobr1

src/shape.js

@@ -354,8 +354,7 @@ export class Shape extends Element {
   /**
    * @name Two.Shape#dispose
    * @function
-   * @description Release the element's renderer object and detach any events.
-   * This cleans up renderer-specific resources and unbinds all event listeners.
+   * @description Release the shape's bound objects by unbinding relevant events.
    */
   dispose() {
     // Call parent dispose to preserve renderer type and unbind events

tests/index.html

@@ -27,6 +27,7 @@
       <script src="./suite/svg-interpreter.js"></script>
       <script src="./suite/bounding-box.js"></script>
       <script src="./suite/release.js"></script>
+      <script src="./suite/dispose.js"></script>
       <script src="./suite/hit-test.js"></script>
     </div>
   </body>

tests/noWebGL.html

@@ -23,6 +23,7 @@
       <script src="./suite/svg-interpreter.js"></script>
       <script src="./suite/bounding-box.js"></script>
       <script src="./suite/release.js"></script>
+      <script src="./suite/dispose.js"></script>
 
     </div>
   </body>