feat: add current file context automatically to chat

[uinstinct]

Description

This PR adds the ability to have the current file context added to a new chat.

I really like this feature from when I used Augment and wanted it in Continue.

In this PR:

• adds a new vscode setting addFileContext for the extension
• the file context is added a mention so that it is removable
• the file context gets added when a new chat is initialized

Closes #5457

Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screenshots

feat.mp4

Tests

[ What tests were added or updated to ensure the changes work as expected? ]

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Summary by mrge

Added a setting to automatically include the current file context as a removable mention when starting a new chat.

• New Features
  • New addFileContext setting in VS Code extension.
  • Current file context is added to new chats if the setting is enabled.

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[Patrick-Erichsen]

This looks great! We've gone back and forth on this feature in the past but I think it's worth experimenting with again.

That being said, I think this should be configured as a UI setting, not an IDE setting.

@RomneyDa recently added a new section for experimental settings in https://github.com/continuedev/continue/blob/main/gui/src/pages/config/UserSettingsForm.tsx, so let's move this in there and then it should be good to go 👍

My other comments were just a few small nitpicks.

[Patrick-Erichsen]

Thanks for making those updates! It looks like you moved the setting to the UI, but I was thinking specifically of placing it under the new "Experimental Settings" section. I think you just need to merge main and move the toggle to that section and then we're good to go 👍

[uinstinct]

Apologies. Missed that part!
Made the changes now!

Also changed the vertical spacing on the experimental section to match with the other toggles' vertical spacing

[Patrick-Erichsen]

Nice, thanks for cleaning up the UI while you were editing the experimental section! Appreciate your patience on the back and forth requests here, looking forward to getting this in next pre-release 🚀