[Editor] Allow to select a freetext editor when in ink mode

- and when in ink mode, change the toolbar active button when
  a freetext edited.

src/display/editor/annotation_editor_layer.js

@@ -95,6 +95,15 @@ class AnnotationEditorLayer {
     this.#uiManager.addLayer(this);
   }
 
+  /**
+   * Update the toolbar if it's required to reflect the tool currently used.
+   * @param {number} mode
+   * @returns {undefined}
+   */
+  updateToolbar(mode) {
+    this.#uiManager.updateToolbar(mode);
+  }
+
   /**
    * The mode has changed: it must be updated.
    * @param {number} mode

src/display/editor/freetext.js

@@ -209,6 +209,7 @@ class FreeTextEditor extends AnnotationEditor {
 
   /** @inheritdoc */
   enableEditMode() {
+    this.parent.updateToolbar(AnnotationEditorType.FREETEXT);
     super.enableEditMode();
     this.overlayDiv.classList.remove("enabled");
     this.editorDiv.contentEditable = true;

src/display/editor/tools.js

@@ -319,7 +319,7 @@ class AnnotationEditorUIManager {
   }
 
   #dispatchUpdateUI(details) {
-    this.#eventBus?.dispatch("annotationeditorparamschanged", {
+    this.#eventBus.dispatch("annotationeditorparamschanged", {
       source: this,
       details,
     });
@@ -377,6 +377,21 @@ class AnnotationEditorUIManager {
     }
   }
 
+  /**
+   * Update the toolbar if it's required to reflect the tool currently used.
+   * @param {number} mode
+   * @returns {undefined}
+   */
+  updateToolbar(mode) {
+    if (mode === this.#mode) {
+      return;
+    }
+    this.#eventBus.dispatch("switchannotationeditormode", {
+      source: this,
+      mode,
+    });
+  }
+
   /**
    * Update a parameter in the current editor or globally.
    * @param {number} type