Implement `removeMessage` in `useMessageStore` to allow for atomic message deletion from the state. Improve `useChatScreen` loading logic to prevent layout jumps and ensure consistent UI state during initial message loading. Additionally, add type safety for WebSocket sequence numbers and optimize message selector stability.
- Add `removeMessage` action to `useMessageStore` for state-consistent deletions
- Refine `useChatScreen` loading state logic to prevent FlashList layout issues
- Ensure `useMessages` hook returns a stable `EMPTY_MESSAGES` constant
- Cast WebSocket `seq` to integer to ensure consistent numeric comparison
- Update `useChatScreen` to use `useMessageStore` for immediate local deletion feedback
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