Fix conflict of @ context selections and user intended annotations start with @

[dogusata]

Problem

It is not possible to write any text which starts with @ character if they are not in the available contexts list. And if it is in the context list, it works as a context instead of user intended text.

Solution

• Added checks to avoid removal of the word if it starts with @ character and not in the available context selection list
• Added checks to send only the words start with @ character in the available context items list as part of the prompt object
• Added checks to paint only the words start with @ character in the available context items list, otherwise keep as normal texts

Here's how it works:

[senorflor]

Nice, thanks for addressing so quickly, and for generalizing the expected behaviors from the issue into a more coherent feature set!