feat: add analytics visibility settings and export functionality

- Added `analytics_visibility` column to `rooms` table to control who can view analytics data.
- Updated analytics routes to check visibility settings before allowing access and export of analytics data.
- Implemented export functionality for analytics in CSV, XLSX, and PDF formats.
- Enhanced `AnalyticsList` component to include export options for analytics entries.
- Updated room detail page to allow setting analytics visibility when creating or editing rooms.
- Added translations for new analytics visibility options and export messages.

server/routes/rooms.js

@@ -245,6 +245,7 @@ router.put('/:uid', authenticateToken, async (req, res) => {
       guest_access,
       moderator_code,
       learning_analytics,
+      analytics_visibility,
     } = req.body;
 
     // M12: field length limits (same as create)
@@ -285,6 +286,7 @@ router.put('/:uid', authenticateToken, async (req, res) => {
         guest_access = COALESCE(?, guest_access),
         moderator_code = ?,
         learning_analytics = COALESCE(?, learning_analytics),
+        analytics_visibility = COALESCE(?, analytics_visibility),
         updated_at = CURRENT_TIMESTAMP
       WHERE uid = ?
     `, [
@@ -300,6 +302,7 @@ router.put('/:uid', authenticateToken, async (req, res) => {
       guest_access !== undefined ? (guest_access ? 1 : 0) : null,
       moderator_code !== undefined ? (moderator_code || null) : room.moderator_code,
       learning_analytics !== undefined ? (learning_analytics ? 1 : 0) : null,
+      analytics_visibility && ['owner', 'shared'].includes(analytics_visibility) ? analytics_visibility : null,
       req.params.uid,
     ]);