Upgrade Asset Manager and Inbox; load Resend templates in Broadcast; v2.5.0

- Asset Manager: search/filter/sort, list+grid views, rename, move between R2 folders, tag chips, bulk actions, used-in counts; fix R2 delete lookup
- Inbox: readable wrapped rows with subject/preview, real read state, type filters, bulk actions, mojibake repair
- Broadcast: pick a Resend template to fill subject and body

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.3.2",
+  "version": "2.5.0",
   "type": "module",
   "scripts": {
     "dev": "vite",