fix(fiber): defer invalidation during root updates

[raashish1601]

Summary

Fixes #3750.

• Track in-flight root configure/render updates so invalidation is deferred until the update scope finishes.
• Skip frame invalidation while a root update is actively mutating camera/object state.
• Add regression coverage that updates camera and object props together and asserts no mixed old/new frame is observed.

Validation

• corepack yarn prettier --check packages/fiber/src/core/loop.ts packages/fiber/src/core/renderer.tsx packages/fiber/src/core/store.ts packages/fiber/tests/renderer.test.tsx
• corepack yarn eslint packages/fiber/src/core/loop.ts packages/fiber/src/core/renderer.tsx packages/fiber/src/core/store.ts packages/fiber/tests/renderer.test.tsx (exits 0; repository has pre-existing warnings)
• corepack yarn jest packages/fiber/tests/renderer.test.tsx -t "updates camera and objects atomically during prop-driven scene updates" --runInBand
• corepack yarn jest packages/fiber/tests/renderer.test.tsx --runInBand
• corepack yarn typecheck
• corepack yarn validate
• git diff --check

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