refactor ui (#17)

* wip: redesign sidebar

* wip: adjust dpi

* update

* update

* refactor modal

* fix modal

assets/icons/chevron-down.svg

@@ -1,3 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="none" viewBox="0 0 24 24">
-  <path fill="currentColor" d="M9.8 10.25c-1.052 0-1.633 1.221-.97 2.038l2.2 2.707c.5.616 1.44.616 1.94 0l2.2-2.707c.664-.817.082-2.038-.97-2.038H9.8Z"/>
-</svg>