Fix prayer page errors: add missing translations and fix time formatting

- Added missing 'categories.all' translation in both ro.json and en.json
- Fixed relativeTime formatting by using new Date() instead of useNow hook
- Removed unused useNow import

🤖 Generated with Claude Code

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

messages/en.json

@@ -148,6 +148,7 @@
       "prayFor": "Pray for this",
       "categories": {
         "title": "Categories",
+        "all": "All",
         "personal": "Personal",
         "family": "Family",
         "health": "Health",

messages/ro.json

@@ -148,6 +148,7 @@
       "prayFor": "Mă rog pentru aceasta",
       "categories": {
         "title": "Categorii",
+        "all": "Toate",
         "personal": "Personal",
         "family": "Familie",
         "health": "Sănătate",