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-contextmenu/dees-contextmenu.ts

@@ -16,6 +16,7 @@ import * as domtools from '@design.estate/dees-domtools';
 import { DeesWindowLayer } from '../dees-windowlayer/dees-windowlayer.js';
 import { zIndexLayers } from '../00zindex.js';
 import '../dees-icon/dees-icon.js';
+import { themeDefaultStyles } from '../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -143,8 +144,10 @@ export class DeesContextmenu extends DeesElement {
    * STATIC STYLES
    */
   public static styles = [
+    themeDefaultStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: block;
         transition: opacity 0.2s, transform 0.2s;