[CON-257] .prompt file prompt is not seen by the LLM in later messages

[sestinj]

Before submitting your bug report

• [X] I believe this is a bug. I'll try to join the Continue Discord for questions
• [X] I'm not able to find an open issue that reports the same bug
• [X] I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

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Description

When using a .prompt file, later messages are not aware of the prompt because it is hidden within the slash command.

We don't want to show the entire prompt file prompt in the user input box, so we need a way of saving the "resolved" prompt like we do with context providers

To reproduce

1. Write a prompt file
2. Use it with a slash command

Log output

No response

_CON-257