doc: comments for codebase and updated documentation

src/features/SetupFont/lib/controlManager/controlManager.svelte.ts

@@ -3,6 +3,12 @@ import {
     createTypographyControl,
 } from '$shared/lib';
 
+/**
+ * Creates a typography control manager that handles a collection of typography controls.
+ *
+ * @param configs - Array of control configurations.
+ * @returns - Typography control manager instance.
+ */
 export function createTypographyControlManager(configs: ControlModel[]) {
     const controls = $state(
         configs.map(({ id, increaseLabel, decreaseLabel, controlLabel, ...config }) => ({