doc: comments for codebase and updated documentation

src/shared/ui/ComboControl/ComboControl.svelte

@@ -1,3 +1,10 @@
+<!--
+    Component: ComboControl
+    Provides multiple ways to change certain value
+    - via Increase/Decrease buttons
+    - via Slider
+    - via Input
+-->
 <script lang="ts">
 import type { TypographyControl } from '$shared/lib';
 import { Button } from '$shared/shadcn/ui/button';