fix(styling): Consolidated shared styles for consistent font applied across various components.

ts_web/elements/letterheader.ts

@@ -11,6 +11,7 @@ import {
 } from '@design.estate/dees-element';
 
 import * as plugins from '../plugins.js';
+import { dedocumentSharedStyle } from '../style.js';
 
 declare global {
   interface HTMLElementTagNameMap {
@@ -49,6 +50,7 @@ export class DeLetterHeader extends DeesElement {
 
   public static styles = [
     domtools.elementBasic.staticStyles,
+    dedocumentSharedStyle,
     css`
       :host {
         color: #333;