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/00group-input/dees-input-phone/dees-input-phone.ts

@@ -10,6 +10,7 @@ import {
 import * as domtools from '@design.estate/dees-domtools';
 import { DeesInputBase } from '../dees-input-base/dees-input-base.js';
 import { demoFunc } from './dees-input-phone.demo.js';
+import { themeDefaultStyles } from '../../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -33,9 +34,11 @@ export class DeesInputPhone extends DeesInputBase<DeesInputPhone> {
   accessor placeholder: string = '+1 (555) 123-4567';
 
   public static styles = [
+    themeDefaultStyles,
     ...DeesInputBase.baseStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       /* Phone input specific styles can go here */
     `,
   ];