Add createEffectComponent, a thin r3f-native effect factory

[kvvasuu]

Summary

First PR in a stack that reworks how effects handle props (full context in later PRs - this one is purely additive and changes no existing behavior).

• Adds createEffectComponent, a thin factory that registers a postprocessing effect class as an r3f intrinsic and lets r3f's own reconciler handle everything: args-driven reconstruction, live prop application (with the same Color/Vector coercion and reset-to-default on removal any r3f element gets), and disposal. No custom accessor scanning, no fingerprinting - only fits effects whose constructor works with zero arguments (new Effect()), since r3f's own reset-on-removal falls back to 0 otherwise.
• Adds useLiveDefaults, the equivalent mechanism for effects that require real constructor args (scene/camera/etc.) and therefore can't use createEffectComponent. Snapshots each live-mutable property's constructor-time default once per instance, and only calls its setter when the resolved value actually changed - some setters have side effects beyond storing the value, so redundant calls aren't safe to make on every render.
• wrapEffect (for wrapping your own third-party effect classes) is untouched behaviorally - only its EffectConstructor type moved to live in createEffectComponent.tsx, re-exported from wrapEffect.tsx for compatibility.

Nothing in this PR is consumed by any existing effect yet - that happens in the following PRs in this stack.