docs: add comment to handleInput

frontend/src/mixins/debounce.ts

@@ -1,17 +1,35 @@
 import {LitElement} from 'lit';
 import {Constructor} from './utils';
 
+/**
+ * Interface for the DebounceMixin.
+ * It defines the structure that DebounceMixin should adhere to.
+ */
 export interface DebounceMixinInterface {
   timeout?: number;
   debounce<F extends () => void>(func: F, wait?: number): void;
 }
 
+/**
+ * A mixin class for debouncing function calls.
+ * It extends the LitElement class and adds debouncing functionality.
+ * It is used to prevent a function from being called multiple times in a short period of time.
+ * It is usefull to avoid multiple calls to a function when the user is typing in an input field.
+ * @param {Constructor<LitElement>} superClass - The superclass to extend from.
+ * @returns {Constructor<DebounceMixinInterface> & T} - The extended class with debouncing functionality.
+ */
 export const DebounceMixin = <T extends Constructor<LitElement>>(
   superClass: T
 ) =>
   class extends superClass {
     timeout?: number = undefined;
 
+    /**
+     * Debounces a function call.
+     * It delays the execution of the function until after wait milliseconds have elapsed since the last time this function was invoked.
+     * @param {Function} func - The function to debounce.
+     * @param {number} wait - The number of milliseconds to delay.
+     */
     debounce<F extends () => void>(func: F, wait = 300): void {
       // eslint-disable-next-line @typescript-eslint/no-this-alias
       const self = this;