Release Cedar 0.2.2

[oshtz]

Summary

• fix the custom GPUI minimize, maximize, restore, and close controls
• add native GitHub release updates with checksum verification, health confirmation, and rollback
• expose update controls and automatic checks in Settings
• add executable window-control smoke coverage and harden visual QA/release documentation

Verification

• cargo fmt --check
• cargo test --locked
• cargo clippy --locked --all-targets --all-features -- -D warnings
• scripts/package-windows.ps1
• actionlint for CI and release workflows
• PowerShell parser validation