fix(web): render custom HTML and Markdown content consistently (#5760)

* fix(markdown): render announcement markdown consistently

- support soft line breaks for announcement markdown without changing the default parser behavior.
- add explicit markdown element styles so lists, tables, code blocks, and quotes render correctly when typography styles are unavailable.
- apply the announcement markdown mode in both the popover and detail dialog for consistent display.

* refactor(markdown): simplify fallback markdown styles

- remove duplicate typography utility classes now covered by explicit markdown element fallbacks.
- keep the markdown renderer behavior unchanged while reducing class noise.
- modernize small helper expressions to satisfy targeted lint checks.

* fix(content): render custom HTML consistently

- add shared rich content rendering so custom HTML and Markdown use the same path across public pages and announcements.
- reuse common URL and HTML detection instead of duplicating content format checks per page.
- keep custom home content inside the standard public layout while preserving full-page iframe rendering for external URLs.

web/default/src/components/rich-content.tsx

@@ -0,0 +1,39 @@
+/*
+Copyright (C) 2023-2026 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+import { isLikelyHtml } from '@/lib/content-format'
+import { HtmlContent } from '@/components/html-content'
+import { Markdown } from '@/components/ui/markdown'
+
+interface RichContentProps {
+  content: string
+  breaks?: boolean
+  className?: string
+}
+
+export function RichContent(props: RichContentProps) {
+  if (isLikelyHtml(props.content)) {
+    return <HtmlContent content={props.content} className={props.className} />
+  }
+
+  return (
+    <Markdown breaks={props.breaks} className={props.className}>
+      {props.content}
+    </Markdown>
+  )
+}