[IMP] mail: use JSDoc annotations for signals in call_debrief

Author: nd-dew

addons/mail/static/src/views/fields/call_debrief/call_debrief_media_controls.js

@@ -4,6 +4,7 @@ export class CallDebriefMediaControls extends Component {
     static template = "mail.CallDebriefMediaControls";
 
     setup() {
+        /** @type {import("@odoo/owl").Signal<boolean>} */
         this.isVolumeSliderVisible = signal(false);
     }
 

addons/mail/static/src/views/fields/call_debrief/call_debrief_timeline.js

@@ -5,6 +5,7 @@ export class CallDebriefTimeline extends Component {
     static template = "mail.CallDebriefTimeline";
 
     setup() {
+        /** @type {import("@odoo/owl").Signal<HTMLElement>} */
         this.timeline = signal(null);
         this.isDragging = false;