v1.0.1 UI and availability Improvements

✔ No breaking changes.

🎨 UI Improvements

1. If decrypt aes key not found, now Maskbook will display a more meaningful error message.
2. Cut the encrypted post because it is not human-readable.

👩‍💻 Miscellaneous

1. Use a more stable way to detect public keys in the background.
2. Use a better way to detect encrypted post.