feat(theme,interfaces): Introduce a global theming system and unify menu/tab interfaces; migrate components to use themeDefaultStyles and update APIs accordingly

ts_web/elements/dees-mobilenavigation/dees-mobilenavigation.ts

@@ -14,6 +14,7 @@ import {
 } from '@design.estate/dees-element';
 import { DeesWindowLayer } from '../dees-windowlayer/dees-windowlayer.js';
 import '../dees-icon/dees-icon.js';
+import { themeDefaultStyles } from '../00theme.js';
 
 @customElement('dees-mobilenavigation')
 export class DeesMobilenavigation extends DeesElement {
@@ -111,8 +112,10 @@ export class DeesMobilenavigation extends DeesElement {
   }
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         font-family: ${cssGeistFontFamily};
       }