Add the "Click to add a cell" button

[jtpio]

#6838 updated to JupyterLab 4.0.0b2 but disabled the "Click to add a cell" button:

It's a useful feature and should be re-enabled.

[jtpio]

Related issue: jupyterlab/jupyterlab#14453

[BrahmDevPandey]

Can I take this issue??

[andrii-i]

Hi @BrahmDevPandey! No need to ask, you can start working on the issue and open a PR when ready.

[jtpio]

For reference this issue might currently be blocked by jupyterlab/jupyterlab#14453 and the outcome of #6855.

[jtpio]

This should also fix #6389

[jtpio]

@BrahmDevPandey the latest main should now include the changes from jupyterlab/jupyterlab#14453. So it should be possible to resume work on this if you would like to.

Likely the only change is to remove these two lines:

notebook/packages/notebook-extension/style/base.css

Lines 127 to 128 in 573becf

	/* TODO: re-enable */
	display: none;

Thanks!