textfields: fix up flakiness in text selection

[mimecuvalo]

This PR #3498 which tried to fix accidentally dragging shapes behind other shapes made clicking into textfields worse unfortunately. (as seen below in the Before video).

This PR takes a different tact by introducing not just data-iseditinganything but now also data-isselectinganything which makes Shapes z-indices actually be relevant vs. the canvas being the top z-index layer, when something is selected or being editing. It's worth a good think over this and any downstream consequences this might introduce. I think this change will actually be ok for when we're in select state but I wouldn't be surprised if I'm missing some nuance.

Before:

Kapture.2024-04-23.at.16.19.04.mp4

After:

Kapture.2024-04-23.at.16.18.32.mp4

Change Type

• sdk — Changes the tldraw SDK
• dotcom — Changes the tldraw.com web app
• docs — Changes to the documentation, examples, or templates.
• vs code — Changes to the vscode plugin
• internal — Does not affect user-facing stuff

• bugfix — Bug fix
• feature — New feature
• improvement — Improving existing features
• chore — Updating dependencies, other boring stuff
• galaxy brain — Architectural changes
• tests — Changes to any test code
• tools — Changes to infrastructure, CI, internal scripts, debugging tools, etc.
• dunno — I don't know

Release Notes

• Textfields: fix up regression to selection when clicking into a text shape.

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