[Bug] press delete button twice at the first empty line of the document

[LucasXu0]

Bug Description

https://discord.com/channels/903549834160635914/1189250440219590719/1321018938104221737

another bug that i'm facing is this, every after i delete a text in the first letter of line will be at the end, i'm sorry if my explanation about the bug is confusing but you can see at the video

last one is embedded link on a text, every after using the feature once, i can't open the menu again, i need to close the keyboard first to use it again

How to Reproduce

• Press the delete button twice on the first empty line of the document.
• Input something.
• The cursor position is not correct for the first character.

Expected Behavior

The cursor position should be after the first character of the first input.

Operating System

Mobile

AppFlowy Version(s)

0.7.8

Screenshots

No response

Additional Context

No response