[bugfix] Cleanup input state after middle-click-to-pan

[ds300]

closes #3013
closes #3733

This fixes a bug wherein the inputs.isPanning state was not being unset correctly after a middle-click-to-pan gesture with a mouse.

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

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• Unit Tests
• End to end tests

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Name	Status	Preview	Updated (UTC)
examples	✅ Ready (Inspect)	Visit Preview	May 21, 2024 8:43am

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