Update Ghostty integration to latest libghostty-vt API #537

Job	Run time
Native Build (macOS) (arm64)	50s
Native Build (Linux) (arm64, ubuntu-24.04-arm, aarch64-linux-gnu)	58s
Native Build (macOS) (x64)	38s
Native Build (Linux) (x64, ubuntu-latest, x86_64-linux-gnu)	1m 35s
Native Build (Windows arm64)	1m 11s
Native Build (Windows x64)	1m 3s
Build & Test (ubuntu-latest)	5m 2s
Build & Test (windows-latest)	6m 34s
Build & Test (macos-latest)	5m 15s
Integration Tests (macOS)	42s
Pack NuGet	1m 55s
	25m 43s

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