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/Accordion/AccordionItem.svelte

@@ -1,7 +1,7 @@
 <script>
   /**
    * Specify the title of the accordion item heading
-   * Alternatively, use the named slot "title" (e.g. <div slot="title">...</div>)
+   * Alternatively, use the named slot "title" (e.g., <div slot="title">...</div>)
    */
   export let title = "title";