Give the homepage teaser a rich text editor

Replace the plain textarea for the homepage_teaser setting with the shared
TipTap rich-text editor, and render the teaser as sanitized HTML in the
portal hero's default layout.

- SettingsAdmin: teaser field now uses RichTextEditor (lazy-loaded, code-split
  like PostEditor); rich fields render in a <div> wrapper instead of <label>.
- HeroElement: text-block lines flagged `html` render sanitized HTML.
- heroLayout: the default-layout teaser line is now an HTML line.
- admin.controller: sanitize homepage_teaser against the body allowlist on save.
- theme.css: collapse the teaser's nested block margins in the hero.

Closes #48

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/src/components/HeroElement.jsx

@@ -1,4 +1,5 @@
 import { Link } from 'react-router-dom'
+import DOMPurify from 'dompurify'
 
 const MOON_IMAGE = '/assets/img/hero-moon.png'
 
@@ -34,7 +35,19 @@ function TextBlock({ props }) {
   return (
     <div style={{ textAlign: align, textShadow: '0 2px 22px rgba(0,0,0,0.82)' }}>
       {(props.lines || []).map((line, i) => {
-        const Tag = /^(h1|h2|h3|p|span)$/.test(line.tag) ? line.tag : 'p'
+        const Tag = /^(h1|h2|h3|p|span|div)$/.test(line.tag) ? line.tag : 'p'
+        // A rich-text line (e.g. the homepage teaser) carries sanitized HTML;
+        // sanitize again on render as defense in depth. Others render as text.
+        if (line.html) {
+          return (
+            <Tag
+              key={i}
+              className="hero-rich"
+              style={lineStyle(line)}
+              dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(line.text || '') }}
+            />
+          )
+        }
         return (
           <Tag key={i} style={lineStyle(line)}>
             {line.text}

client/src/lib/heroLayout.js

@@ -64,7 +64,7 @@ export function defaultLayout(teaser) {
             { text: 'Private shard project', tag: 'span', fontSize: '0.74rem', color: '#c2d2e6', weight: 700, letterSpacing: '0.22em', transform: 'uppercase', font: 'sans' },
             { text: 'UOMysticmoon', tag: 'h1', fontSize: 'clamp(3rem,8.5vw,5.75rem)', color: 'var(--head)', weight: 600, letterSpacing: '0.02em', lineHeight: 1, font: 'display', marginTop: 14 },
             { text: 'A private Ultima Online world in progress', tag: 'p', fontSize: '1.32rem', color: '#dbe2ea', italic: true, marginTop: 22 },
-            { text: teaser, tag: 'p', fontSize: '1.06rem', color: '#c4cdd8', maxWidth: 600, marginTop: 22 },
+            { text: teaser, tag: 'div', html: true, fontSize: '1.06rem', color: '#c4cdd8', maxWidth: 600, marginTop: 22 },
           ],
         },
       },

client/src/routes/admin/views/SettingsAdmin.jsx

@@ -1,13 +1,21 @@
-import { useEffect, useState } from 'react'
+import { lazy, Suspense, useEffect, useState } from 'react'
 import { Loading, ErrorState } from '../../../components/PageState.jsx'
 import { api } from '../../../api/client.js'
 import { useSite } from '../../../contexts/SiteContext.jsx'
 import EmailDelivery from './EmailDelivery.jsx'
 
+// Lazy-loaded so the heavy rich-text editor stays code-split (matches PostEditor).
+const RichTextEditor = lazy(() => import('../../../components/RichTextEditor.jsx'))
+
 // Editable settings shown on this screen (key -> label + control type).
 const FIELDS = [
   { key: 'site_title', label: 'Site title' },
-  { key: 'homepage_teaser', label: 'Homepage teaser', long: true },
+  {
+    key: 'homepage_teaser',
+    label: 'Homepage teaser',
+    rich: true,
+    help: 'Rich text shown under the hero heading on the portal (when no custom hero layout is published).',
+  },
   { key: 'maintenance_message', label: 'Maintenance message', long: true },
   { key: 'status_message', label: 'Status message' },
   {
@@ -59,10 +67,13 @@ export default function SettingsAdmin() {
   if (loading) return <Loading />
   if (error) return <ErrorState message={error} />
 
-  const set = (k) => (e) => {
-    setValues((v) => ({ ...v, [k]: e.target.value }))
+  // setRaw takes the next value directly (rich editor onChange), set adapts a
+  // DOM change event onto it.
+  const setRaw = (k) => (val) => {
+    setValues((v) => ({ ...v, [k]: val }))
     setSaved(false)
   }
+  const set = (k) => (e) => setRaw(k)(e.target.value)
 
   async function save() {
     setBusy(true)
@@ -82,10 +93,18 @@ export default function SettingsAdmin() {
   return (
     <section style={{ maxWidth: 620 }}>
       <div style={{ display: 'flex', flexDirection: 'column', gap: 18 }}>
-        {FIELDS.map((f) => (
-          <label key={f.key} style={{ display: 'block' }}>
+        {FIELDS.map((f) => {
+          // A rich field can't live inside a <label> (nested toolbar buttons +
+          // contenteditable), so it uses a plain <div> wrapper instead.
+          const Wrap = f.rich ? 'div' : 'label'
+          return (
+          <Wrap key={f.key} style={{ display: 'block' }}>
             <span className="field-label">{f.label}</span>
-            {f.options ? (
+            {f.rich ? (
+              <Suspense fallback={<span className="spin" />}>
+                <RichTextEditor value={values[f.key]} onChange={setRaw(f.key)} variant="post" />
+              </Suspense>
+            ) : f.options ? (
               <select value={values[f.key]} onChange={set(f.key)} className="select">
                 {f.options.map((o) => (
                   <option key={o.value} value={o.value}>
@@ -103,8 +122,9 @@ export default function SettingsAdmin() {
                 {f.help}
               </span>
             )}
-          </label>
-        ))}
+          </Wrap>
+          )
+        })}
         <div style={{ display: 'flex', gap: 10, marginTop: 6, alignItems: 'center' }}>
           <button onClick={save} disabled={busy} className="btn btn-primary btn-sq">
             {busy ? 'Saving…' : 'Save changes'}

client/src/styles/theme.css

@@ -546,6 +546,20 @@ button[disabled] {
 }
 
 /* ===== Hero canvas editor ===== */
+/* Rich-text hero line (e.g. the homepage teaser). Inherits the line's font/color
+   from its inline style; collapse the editor's outer block margins so spacing is
+   driven by the line's own marginTop rather than a nested <p>. */
+.hero-rich > :first-child {
+  margin-top: 0;
+}
+.hero-rich > :last-child {
+  margin-bottom: 0;
+}
+.hero-rich a {
+  color: inherit;
+  text-decoration: underline;
+}
+
 .hero-el-editable {
   outline: 1px dashed rgba(127, 153, 189, 0.45);
   outline-offset: 2px;