Update icons, screenshots, and UX improvements

- Refactor icon picker to use full Ionicons set dynamically
- Add date sort toggle to My Answers screen
- Fix match deduplication and show total count on home
- Clear stale data when switching chats
- Update app store screenshots
- Bump build number to 25

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/mobile/src/hooks/useMessageSubscription.ts

@@ -104,6 +104,7 @@ export const useMessageSubscription = (
 
         const fetchMessagesAndMarkRead = async () => {
             setLoading(true);
+            setAllMessages([]); // Clear previous chat's messages immediately
 
             const { data } = await supabase
                 .from('messages')