Admin reorganization: nav groups, streak/progress display in Study Users; v1.1.1

- Split "Manage" nav group into Audience, Insights, Tools
- Moved Email Templates into Configure group
- Added Testimonials to About jump nav
- Added RSS Feed tab to Podcast Hub
- Updated Study Users expanded card: shows last studied date, streak (current + longest), and per-study lesson completion count
- Streak pill shown in collapsed header when > 0

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "1.1.0",
+  "version": "1.1.1",
   "type": "module",
   "scripts": {
     "dev": "vite",