Generate prayer ID on server to fix crypto.randomUUID browser compat

Older browsers (and non-HTTPS contexts) don't have crypto.randomUUID.
Move ID generation to the server using Node's built-in crypto module.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DReRqHxSYuVfCzTzQGD9hZ

src/usePrayers.ts

@@ -25,8 +25,7 @@ export function usePrayers() {
   }, []);
 
   const addPrayer = useCallback(async (request: string, tags: string[]) => {
-    const prayer: Prayer = {
-      id: crypto.randomUUID(),
+    const prayer = {
       request,
       answer: '',
       status: 'active',