properly close modal stack in order on escape

src/App.svelte

@@ -9,6 +9,7 @@
   import NewChat from './lib/NewChat.svelte'
   import { chatsStorage, apiKeyStorage } from './lib/Storage.svelte'
   import { Modals, closeModal } from 'svelte-modals'
+  import { triggerModalEsc } from './lib/Util.svelte'
 
   // The definition of the routes with some conditions
   const routes = {
@@ -51,6 +52,10 @@
   />
 </Modals>
 
+<svelte:window
+  on:keydown={(e) => triggerModalEsc(e)}
+/>
+
 <style>
   .backdrop {
     position: fixed;