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-input/dees-input-list/dees-input-list.ts

@@ -11,6 +11,7 @@ import { DeesInputBase } from '../dees-input-base/dees-input-base.js';
 import '../../dees-icon/dees-icon.js';
 import '../../00group-button/dees-button/dees-button.js';
 import { demoFunc } from './dees-input-list.demo.js';
+import { themeDefaultStyles } from '../../00theme.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -64,9 +65,11 @@ export class DeesInputList extends DeesInputBase<DeesInputList> {
   accessor dragOverIndex: number = -1;
 
   public static styles = [
+    themeDefaultStyles,
     ...DeesInputBase.baseStyles,
     cssManager.defaultStyles,
     css`
+      /* TODO: Migrate hardcoded values to --dees-* CSS variables */
       :host {
         display: block;
         font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;