fix(capture): 修复预览宿主视图布局递归

[iamsyc]

Summary

• remove preview host view layout-time layer resizing to avoid recursive layout warnings
• rely on layer autoresizing and keep scale sync on window and backing changes
• add a focused test to ensure the host view does not duplicate the hosted preview layer

Verification

• xcodebuild -project VoidDisplay.xcodeproj -scheme VoidDisplay -destination 'platform=macOS,arch=arm64' -derivedDataPath /Users/syc/Project/VoidDisplay/.ai-tmp/layout-recursion/DerivedData build
• xcodebuild -project VoidDisplay.xcodeproj -scheme VoidDisplay -destination 'platform=macOS,arch=arm64' -derivedDataPath /Users/syc/Project/VoidDisplay/.ai-tmp/layout-recursion/DerivedData test -only-testing:VoidDisplayTests/ZeroCopyPreviewRendererTests

[github-actions]

CI Summary

Run: Open

Check	Status	Details
Change Scope	code	code-relevant change set
Unit Tests	success	required
UI Smoke Tests (matrix: baseline + permissionDenied + rebuildFailed)	success	required; matrix: baseline + permissionDenied + rebuildFailed
Release Build Check (Release arch smoke: arm64 + x86_64)	success	required; Release arch smoke check (arm64 + x86_64 with thin/sign/verify)
CI Gate	success	required; driven by Unit Tests + UI Smoke Tests + Release Build Check

Gate rule: target main 的代码相关 PR 必须通过 Unit Tests + UI Smoke Tests + Release Build Check。