feat(@lion/ui): add _invokerIconTemplate to LionInputDatepicker

.changeset/stupid-emus-compete.md

@@ -0,0 +1,5 @@
+---
+'@lion/ui': patch
+---
+
+feat(@lion/ui): add \_invokerIconTemplate to LionInputDatepicker

packages/ui/components/input-datepicker/src/LionInputDatepicker.js

@@ -279,11 +279,19 @@ export class LionInputDatepicker extends ScopedElementsMixin(
         aria-label="${this.msgLit('lion-input-datepicker:openDatepickerLabel')}"
         title="${this.msgLit('lion-input-datepicker:openDatepickerLabel')}"
       >
-        📅
+        ${this._invokerIconTemplate()}
       </button>
     `;
   }
 
+  /**
+   * Subclassers can replace this with their custom extension invoker icon
+   */
+  // eslint-disable-next-line class-methods-use-this
+  _invokerIconTemplate() {
+    return html`📅`;
+  }
+
   _setupOverlayCtrl() {
     super._setupOverlayCtrl();