feat(dees-form): add layout styles to dees-form and standardize demo input grouping

ts_web/elements/00group-form/dees-form/dees-form.ts

@@ -1,6 +1,7 @@
 import {
   customElement,
   html,
+  css,
   type TemplateResult,
   DeesElement,
   type CSSResult,
@@ -81,13 +82,25 @@ export class DeesForm extends DeesElement {
   @property({ type: Boolean, reflect: true, attribute: 'horizontal-layout' })
   accessor horizontalLayout: boolean = false;
 
+  public static styles = [
+    css`
+      :host {
+        display: flex;
+        flex-direction: column;
+        gap: 16px;
+      }
+
+      :host([horizontal-layout]) {
+        flex-direction: row;
+        flex-wrap: wrap;
+        align-items: flex-start;
+        gap: 16px;
+      }
+    `,
+  ];
+
   public render(): TemplateResult {
     return html`
-      <style>
-        :host {
-          display: contents;
-        }
-      </style>
       <slot></slot>
     `;
   }