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-statsgrid/dees-statsgrid.ts

@@ -16,6 +16,7 @@ import type { TemplateResult } from '@design.estate/dees-element';
 import '../dees-icon/dees-icon.js';
 import '../dees-contextmenu/dees-contextmenu.js';
 import '../00group-button/dees-button/dees-button.js';
+import { themeDefaultStyles } from '../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -75,8 +76,10 @@ export class DeesStatsGrid extends DeesElement {
   accessor contextMenuActions: plugins.tsclass.website.IMenuItem[] = [];
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: block;
         width: 100%;