chore: improve isEmpty comments for toggleFilterModel

Author: NarrowsProjects

lib/public/components/Filters/common/filters/ToggleFilterModel.js

@@ -51,7 +51,15 @@ export class ToggleFilterModel extends SelectionModel {
     }
 
     /**
-     * @inheritdoc
+     * By default, a value of `false` is treated as an empty state, meaning
+     * the filter is effectively not applied when toggled off.
+     *
+     * However, if the model was constructed with `falseIsEmpty = true`,
+     * then `false` is treated as a valid (non-empty) selection, and this
+     * method will always return `false`.
+     *
+     * @return {boolean} `true` if the current value is considered empty,
+     * otherwise `false`.
      */
     get isEmpty() {
         if (!this._falseIsEmpty) {