Make UI Shell HeaderAction panel transition configurable (#419)

* fix(ui-shell): remove fly transition from hamburger menu

* feat(header-action): make panel transition configurable

* chore: rebuild types, docs

* docs(ui-shell): document transition prop in Header app switcher example

src/Button/Button.svelte

@@ -47,7 +47,7 @@
 
   /**
    * Set to `true` to render a custom HTML element
-   * Props are destructured as `props` in the default slot (e.g. <Button let:props><div {...props}>...</div></Button>)
+   * Props are destructured as `props` in the default slot (e.g., <Button let:props><div {...props}>...</div></Button>)
    */
   export let as = false;