feat(AppSidebar): create first version of AppSidebar widget

src/widgets/AppSidebar/index.ts

@@ -0,0 +1,3 @@
+import AppSidebar from './ui/AppSidebar.svelte';
+
+export { AppSidebar };

src/widgets/AppSidebar/ui/AppSidebar.svelte

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+<script lang="ts">
+import { CategoryFilter } from '$features/CategoryFilter';
+import * as Sidebar from '$shared/shadcn/ui/sidebar/index';
+</script>
+
+<Sidebar.Root>
+    <Sidebar.Content>
+        <CategoryFilter />
+    </Sidebar.Content>
+</Sidebar.Root>