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-hint/dees-hint.ts

@@ -11,6 +11,7 @@ import {
 
 import * as domtools from '@design.estate/dees-domtools';
 import { demoFunc } from './dees-hint.demo.js';
+import { themeDefaultStyles } from '../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -30,7 +31,9 @@ export class DeesHint extends DeesElement {
     domtools.elementBasic.setup();
   }
 
-  public static styles = [cssManager.defaultStyles, css``];
+  public static styles = [themeDefaultStyles, cssManager.defaultStyles, css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
+    `];
 
   public render(): TemplateResult {
     return html` <div class="mainbox"></div> `;