fix: handle chat command selection logic

[abeatrix]

CLOSE #1973
Address the / command bug mentioned in #1968

• Update the chat command selection logic to only filter commands when the input starts with a '/' instead of splitting the input value. (re bug: Chat history gets overwritten when there is a new chat #1968)
• Also update the file completion logic to better preserve the existing input value. (re bug: hitting backspace after @-including a file shouldn't lose the file context #1973)

Test plan

Before

After

Before

slash command can be activated when you paste a paragraph with space to the chat inbox in a new chat, even if the paragraph doesn't starts with a /

Screen.Recording.2023-11-28.at.11.14.35.PM.mov

After

Pasting anything that doesn't start with / will not trigger the selection box

Screen.Recording.2023-11-28.at.11.14.58.PM.mov

[toolmantim]

This seems to work, but the chat transcript seems to render the @-file token inconsistently:

Ideally we'd make the context file selector disappear when they type that additional character (e.g. in the below video, it would disappear again when they type ?). It sticking on and capturing Enter events feels a bit buggy.

Screen.Recording.2023-11-29.at.10.23.25.pm.mov

[abeatrix]

This seems to work, but the chat transcript seems to render the @-file token inconsistently:

Ideally we'd make the context file selector disappear when they type that additional character (e.g. in the below video, it would disappear again when they type ?). It sticking on and capturing Enter events feels a bit buggy.

Screen.Recording.2023-11-29.at.10.23.25.pm.mov

@toolmantim can you take another look at the latest commit and let me know if that works the way you have in mind please? 🙇‍♀️

Screen.Recording.2023-11-29.at.10.30.24.AM.mov

[toolmantim]

Works great! Thanks @abeatrix ✨