fix(ts_web): resolve TypeScript nullability and event typing issues across web components

ts_web/elements/00group-appui/dees-mobilenavigation/dees-mobilenavigation.demo.ts

@@ -1,5 +1,5 @@
 import { html, css } from '@design.estate/dees-element';
-import '../00group-button/dees-button/dees-button.js';
+import '../../00group-button/dees-button/dees-button.js';
 import '../../00group-layout/dees-panel/dees-panel.js';
 import '@design.estate/dees-wcctools/demotools';
 

ts_web/elements/00group-appui/dees-mobilenavigation/dees-mobilenavigation.ts

@@ -301,15 +301,15 @@ export class DeesMobilenavigation extends DeesElement {
     `;
   }
 
-  private windowLayer: DeesWindowLayer;
+  private windowLayer!: DeesWindowLayer;
 
   /**
    * inits the show
    */
   public async show() {
     const domtools = await this.domtoolsPromise;
-    const main = this.shadowRoot.querySelector('.main');
-    
+    const main = this.shadowRoot!.querySelector('.main');
+
     // Create window layer first (it will get its own z-index)
     if (!this.windowLayer) {
       this.windowLayer = await DeesWindowLayer.createAndShow({
@@ -328,7 +328,7 @@ export class DeesMobilenavigation extends DeesElement {
     zIndexRegistry.register(this, this.mobileNavZIndex);
 
     await domtools.convenience.smartdelay.delayFor(10);
-    main.classList.add('show');
+    main!.classList.add('show');
   }
 
   /**
@@ -336,8 +336,8 @@ export class DeesMobilenavigation extends DeesElement {
    */
   public async hide() {
     const domtools = await this.domtoolsPromise;
-    const main = this.shadowRoot.querySelector('.main');
-    main.classList.remove('show');
+    const main = this.shadowRoot!.querySelector('.main');
+    main!.classList.remove('show');
     
     // Unregister from z-index registry
     zIndexRegistry.unregister(this);