Making files dragable and dropable from TabBar.

[nakul-py]

This PR makes files dragable and dropable from TabBar into the chat.

Screencast.From.2025-12-08.18-55-44.mp4

This enhancement is done with the help of @brichet ❤️

[github-actions]

👈 Launch a Binder on branch nakul-py/jupyter-chat/tabbar

[brichet]

Cross reference to jupyterlite/ai#236, where this issue as first been discussed.

[brichet]

Thanks @nakul-py, looks nice.

I only have some comments about typing.
The suggestions cannot be applied as it, there will be some issue with import. Also it may be useful to add the packages in the dependencies if they are not already there.

[brichet]

Thanks @nakul-py, looks like the dependencies are missing from package.json file (and yarn.lock).
We should probably add the following dependency in packages/jupyter-chat/package.json:

...
"@jupyterlab/docregistry": "^4.2.0",
...
"@lumino/widgets": "^2.0.0",

Then you'll need to run jlpm install, maybe test that it builds, and push the changes if everything is fine.

[nakul-py]

We should probably add the following dependency in packages/jupyter-chat/package.json:

...
"@jupyterlab/docregistry": "^4.2.0",
...
"@lumino/widgets": "^2.0.0",

@brichet We already have these dependencies in packages/jupyter-chat/package.json.

[brichet]

We already have these dependencies in packages/jupyter-chat/package.json.

Looks like not

jupyter-chat/packages/jupyter-chat/package.json

Lines 45 to 70 in fbcdf8d

	"dependencies": {
	"@emotion/react": "^11.10.5",
	"@emotion/styled": "^11.10.5",
	"@jupyter/react-components": "^0.15.2",
	"@jupyterlab/application": "^4.2.0",
	"@jupyterlab/apputils": "^4.3.0",
	"@jupyterlab/codeeditor": "^4.2.0",
	"@jupyterlab/codemirror": "^4.2.0",
	"@jupyterlab/docmanager": "^4.2.0",
	"@jupyterlab/filebrowser": "^4.2.0",
	"@jupyterlab/fileeditor": "^4.2.0",
	"@jupyterlab/notebook": "^4.2.0",
	"@jupyterlab/rendermime": "^4.2.0",
	"@jupyterlab/ui-components": "^4.2.0",
	"@lumino/algorithm": "^2.0.0",
	"@lumino/commands": "^2.0.0",
	"@lumino/coreutils": "^2.0.0",
	"@lumino/disposable": "^2.0.0",
	"@lumino/polling": "^2.0.0",
	"@lumino/signaling": "^2.0.0",
	"@mui/icons-material": "^7.3.2",
	"@mui/material": "^7.3.2",
	"clsx": "^2.1.0",
	"react": "^18.2.0",
	"react-dom": "^18.2.0"
	},

[nakul-py]

Looks like not

Ohh by mistake i have seen in

jupyter-chat/packages/jupyterlab-chat/package.json

Line 52 in fbcdf8d

"@jupyterlab/docregistry": "^4.2.0",

I think we have to manually add dependencies.

[brichet]

Thanks @nakul-py 🎉