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

src/lib/firebase-admin.ts

@@ -1,6 +1,6 @@
 import * as admin from 'firebase-admin';
 
-if (!admin.apps.length && process.env.FIREBASE_PROJECT_ID) {
+if (!admin.apps.length) {
   admin.initializeApp({
     credential: admin.credential.cert({
       projectId: process.env.FIREBASE_PROJECT_ID,