Add initial_value attribute & fix static special attribute handling (#1063)

* feat & fix: initial_value attribute, special attribute handling

* revision: rename js file

* fix: rustfmt

* fix: clippy

* fix: desktop not finding common.js

* fix: desktop failing to render

Missed a single ``this.SetAttributeInner`` as it was now ``setAttributeInner``
Javascript didn't even throw any errors about this smh

* revision: no need for match statement

packages/interpreter/src/sledgehammer_bindings.rs

@@ -74,6 +74,9 @@ mod js {
                         node.value = value;
                     }
                     break;
+                case "initial_value":
+                    node.defaultValue = value;
+                    break;
                 case "checked":
                     node.checked = value === "true";
                     break;