chore: add comments for types and constants

src/shared/lib/helpers/createTypographyControl/createTypographyControl.svelte.ts

@@ -4,16 +4,40 @@ import {
 } from '$shared/lib/utils';
 
 export interface ControlDataModel {
+    /**
+     * Control value
+     */
     value: number;
+    /**
+     * Minimal possible value
+     */
     min: number;
+    /**
+     * Maximal possible value
+     */
     max: number;
+    /**
+     * Step size for increase/decrease
+     */
     step: number;
 }
 
 export interface ControlModel extends ControlDataModel {
+    /**
+     * Control identifier
+     */
     id: string;
+    /**
+     * Area label for increase button
+     */
     increaseLabel: string;
+    /**
+     * Area label for decrease button
+     */
     decreaseLabel: string;
+    /**
+     * Control area label
+     */
     controlLabel: string;
 }