Support multi-paragraph host bios on detail page; v2.0.23

Split bio on blank lines to render each paragraph as its own <p> tag.
Also grows the admin textarea from 3 to 8 rows so long bios are easier
to write and review.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/AdminPage.tsx

@@ -5091,7 +5091,7 @@ async function handleAssetUpload(event: ChangeEvent<HTMLInputElement>) {
                         </div>
                         <div className="admin-field">
                           <label>Bio</label>
-                          <textarea rows={3} value={host.bio} onChange={e => updateHost(host.id, { bio: e.target.value })} />
+                          <textarea rows={8} value={host.bio} onChange={e => updateHost(host.id, { bio: e.target.value })} />
                         </div>
                         <div className="admin-field">
                           <label>Photo</label>