Allow for dynamic view switching

[Yahiewi]

This addresses issue #47 by using a local layout tracker for each tab _currentLayoutName, instead of a global one.
This allows users to have multiple tabs with different specta views open simultaneously and switch between them.

Screencast.from.2026-06-01.19-33-32.mp4

[trungleduc]

@Yahiewi could you put your CI fix line here? I want to get this one and #44 in

[Yahiewi]

Hey @trungleduc I've been struggling with the CI for this and I'm not sure what the issue is exactly. It seems to be failing at the environment resolution step but I have no idea why that's failing now. I'm not sure if some of the dependencies were migrated or changed. Do you have an idea maybe on what's breaking this?
BTW, I'm getting the exact same issue for these two other PRs:
Jupyter-plainb PR
Specta PR

[trungleduc]

could you try switching the channel here to emscripten-forge-4x?

[trungleduc]

@Yahiewi please rebase to get the CI fixed

[Yahiewi]

Thanks a lot @trungleduc CI is green now. Hopefully this will also fix the CI for the other PRs.

[trungleduc]

Does this mean we re-render the view on each jupyterlab tab change if the layout is different between 2 tabs?

[trungleduc]

IIRC, I removed the layout switch option because rerendering the view with a different layout on the fly is bugged. Could you double-check this on both Jupyter and the standalone app