Search bar pinned again, now flush under the header at every width (sticky offset follows the header's real height); v2.25.2

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.25.1",
+  "version": "2.25.2",
   "type": "module",
   "scripts": {
     "dev": "vite",