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/features/chat/ChatScreen.tsx

@@ -149,6 +149,7 @@ export const ChatScreen: React.FC = () => {
         if (!matchId) return;
 
         const fetchMatch = async () => {
+            setMatch(null); // Clear previous match data immediately
             const { data } = await supabase
                 .from("matches")
                 .select("*, question:questions(*)")