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-dataview/dees-dataview-statusobject/dees-dataview-statusobject.ts

@@ -16,6 +16,7 @@ import {
 
 import * as tsclass from '@tsclass/tsclass';
 import { DeesContextmenu } from '../../dees-contextmenu/dees-contextmenu.js';
+import { themeDefaultStyles } from '../../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -30,8 +31,10 @@ export class DeesDataviewStatusobject extends DeesElement {
   @property({ type: Object }) accessor statusObject: tsclass.code.IStatusObject;
 
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
       }