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-toast/dees-toast.ts

@@ -4,6 +4,7 @@ import * as domtools from '@design.estate/dees-domtools';
 import { zIndexLayers } from '../00zindex.js';
 import { demoFunc } from './dees-toast.demo.js';
 import { cssGeistFontFamily } from '../00fonts.js';
+import { themeDefaultStyles } from '../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -148,8 +149,10 @@ export class DeesToast extends DeesElement {
   }
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: block;
         pointer-events: auto;