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-button/dees-button-group/dees-button-group.ts

@@ -10,6 +10,7 @@ import {
 
 import * as domtools from '@design.estate/dees-domtools';
 import { demoFunc } from './dees-button-group.demo.js';
+import { themeDefaultStyles } from '../../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -33,8 +34,10 @@ export class DeesButtonGroup extends DeesElement {
   }
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: inline-block;
       }

ts_web/elements/00group-button/dees-button/dees-button.ts

@@ -12,6 +12,7 @@ import {
 
 import * as domtools from '@design.estate/dees-domtools';
 import { demoFunc } from './dees-button.demo.js';
+import { themeDefaultStyles } from '../../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -79,8 +80,10 @@ export class DeesButton extends DeesElement {
   }
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: inline-block;
         box-sizing: border-box;