doc: comments for codebase and updated documentation

src/features/SetupFont/ui/SetupFontMenu.svelte

@@ -1,7 +1,8 @@
+<!--
+    Component: SetupFontMenu
+    Contains controls for setting up font properties.
+-->
 <script lang="ts">
-/**
- * Component containing controls for setting up font properties.
- */
 import { Separator } from '$shared/shadcn/ui/separator/index';
 import { Trigger as SidebarTrigger } from '$shared/shadcn/ui/sidebar';
 import { ComboControl } from '$shared/ui';