Refactor canvas, url state sync, and introduce read only

[elliotBraem]

Changelog

• [x] default read only if not the canvas owner
• [x] refactor UrlStateSync to more closely match tldraw
• [x] move ZoomIn to own component
• [x] remove unused icons

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Name	Status	Preview	Comments	Updated (UTC)
canvas	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 21, 2024 9:18pm