refactor: rename defaultCamera/defaultRaycaster canvas props to camera/raycaster

[bigmistqke]

Summary

Renames the <Canvas> props defaultCamera and defaultRaycaster to camera and raycaster.

The default prefix was chosen to reflect how these props work internally: the canvas maintains a stack for both the active camera and raycaster, and these props seed the bottom of that stack — the fallback that's active unless something higher in the scene graph (e.g. a portal) pushes its own onto the stack.

While accurate, the default prefix turns out to be an implementation detail that leaks into the public API. From a user's perspective, camera and raycaster are simply "the camera/raycaster to use for this canvas" — the stack mechanism is invisible. The longer names also create friction for the common case where users just want to supply a custom camera without thinking about stacks at all.

Changes

• Renames defaultCamera → camera and defaultRaycaster → raycaster on props
• Updates all playground examples, tests, and README to use the new names

Breaking change

This is a rename-only breaking change. No behavior is altered. Users on the previous API need to rename their props.

[pkg-pr-new]

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npm i https://pkg.pr.new/solid-three@48

commit: a7538f4