feat: Add prayer chains, social sharing, and testimony wall

- Add PrayerChain component for visualizing linked prayers
- Add SharePrayer component with social media integration (Twitter, Facebook, WhatsApp, copy link)
- Create /testimonies page for public answered prayer stories
- Update Firestore rules for public testimony access
- Enhance Organization tab with prayer chains
- Add Testimonies navigation tab
- Fix Firebase Admin SDK integration for server-side operations
- Improve email system with proper server-side authentication
- Update prayer form to handle optional fields correctly
- Deploy updated Firestore security rules

firestore.rules

@@ -6,8 +6,33 @@ service cloud.firestore {
       allow read, write: if request.auth != null && request.auth.uid == userId;
     }
 
-    // Allow authenticated users to read/write their own prayers
+    // Allow public reading of answered prayers for testimony wall
     match /prayers/{prayerId} {
+      allow read: if resource.data.answered == true;
+      allow read, write: if request.auth != null && 
+        resource.data.userId == request.auth.uid;
+      allow create: if request.auth != null && 
+        request.resource.data.userId == request.auth.uid;
+    }
+
+    // Allow authenticated users to read/write their own prayer templates
+    match /prayerTemplates/{templateId} {
+      allow read, write: if request.auth != null && 
+        resource.data.userId == request.auth.uid;
+      allow create: if request.auth != null && 
+        request.resource.data.userId == request.auth.uid;
+    }
+
+    // Allow authenticated users to read/write their own prayer goals
+    match /prayerGoals/{goalId} {
+      allow read, write: if request.auth != null && 
+        resource.data.userId == request.auth.uid;
+      allow create: if request.auth != null && 
+        request.resource.data.userId == request.auth.uid;
+    }
+
+    // Allow authenticated users to read/write their own email templates
+    match /emailTemplates/{templateId} {
       allow read, write: if request.auth != null && 
         resource.data.userId == request.auth.uid;
       allow create: if request.auth != null && 
@@ -24,9 +49,10 @@ service cloud.firestore {
       allow read: if true;
     }
 
-    // Allow authenticated users to read/write config (for admin settings)
+    // Allow server-side API access to config (for SMTP settings)
     match /config/{configId} {
-      allow read, write: if request.auth != null;
+      allow read: if true;
+      allow write: if request.auth != null;
     }
 
     // Allow authenticated users to read/write shared prayers