fix(js,dom): add Storage global, CharacterData ChildNode methods, fix remove/isConnected (#176)

fix(dom): add missing DOM/JS shims for modern frameworks

Closes #163.

Adds missing DOM and JS shims required by modern frameworks (Svelte 5, 
Vue, Lit) and consent-management SDKs to execute without errors:

- Define the `Storage` global constructor to resolve `ReferenceError`s 
  and fix `Storage.prototype` access.
- Apply standard ChildNode methods (`before`, `after`, `replaceWith`, 
  `remove`) to `CharacterData.prototype`. This prevents `TypeError`s when 
  frameworks call these on Text or Comment nodes during hydration.
- Update `Element.prototype.isConnected` to perform a genuine parent-walk 
  rather than returning a hardcoded `true`.
- Fix `Element.prototype.remove` to properly clean up the internal ID 
  index so removed elements are no longer queryable.
- Remove outdated no-op stubs on the `Element` class that were shadowing 
  the proper polyfill implementations.

crates/obscura-js/src/ops.rs

@@ -193,7 +193,7 @@ fn op_dom(state: &OpState, #[string] cmd: String, #[string] arg1: String, #[stri
         }
         "remove_child" => {
             let child = arg1.parse::<u32>().unwrap_or(0);
-            dom.detach(NodeId::new(child));
+            dom.remove_child(NodeId::new(child));
             "true".into()
         }
         "insert_before" => {