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>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.0.22",
+  "version": "2.0.23",
   "type": "module",
   "scripts": {
     "dev": "vite",