[DNM] Introduce lexical to improve textarea (better context mention UX, no more hacks with regex, etc)

[elianiva]

it's still in a very rough condition, but basic text editing works for now
just putting this up to let people know and avoid duplicate effort

todo:

• basic text editing
• properly handle keyboard events
• handle commands (currently only used to change mode, but we can expand the idea further)
• handle copy/paste for files
• handle drag and drop
• handle mention (file, commits, etc)
• display mention in a better format
• show included context in current prompt
• other edge cases i haven't found yet
• add tests, there's currently none

a lot of these are generated by gemini 2.5 pro as you can tell by a lot of these useless comments, i've adjusted a few of them but there are still a lot of stuff that needs to be fixed ((it was struggling with apply_diff a lot once it reaches a certain point i ended up stopping it and just do it by hand))

i'll be adjusting/fixing them along the way and posting updates here (and discord)

feel free to comments any of your ideas :)

[changeset-bot]

⚠️ No Changeset found

Latest commit: ff20b25

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[cte]

Nice! I noticed that they have a mentions plugin; should we use that or roll our own?

[elianiva]

Nice! I noticed that they have a mentions plugin; should we use that or roll our own?

currently i want to try to roll our own because i want to experiment a bit with it, having more control is good

[elianiva]

i'll close this one for now, this doesn't have a clear feature description and has been left behind quiet far

i will revisit this and make and issue-first approach later when i've written all the things we need to consider

[cte]

LMK if I can help with this - it's been on my list to explore for a while.