feat(sidebar-avatar): Creat SidebarIndicator & Refactor Sidebar UI

* Add SidebarIndicator
* Remove BarIcon components at Character at Bar
  * It replaced by SidebarAvatar component
  * (TODO: Refactor BarIcon to UI Components & Sidebar State Flow)
* Refactor getCharImage
  * Delete unused code

BREAKING CHANGE:

src/lib/SideBars/SidebarIndicator.svelte

@@ -0,0 +1,17 @@
+<script lang="ts">
+  export let isActive: boolean;
+</script>
+
+<div
+  class="
+      group-hover:bg-white
+      absolute
+      left-[-4px]
+      h-[8px]
+      w-[8px]
+      rounded-full
+      transition-all
+      duration-300
+      {isActive ? 'bg-white !h-[20px]' : 'group-hover:h-[10px]'}
+    "
+/>