Update Ghostty integration to latest libghostty-vt API #531

Job	Run time
Native Build (Windows x64)	3m 16s
Native Build (Linux) (x64, ubuntu-latest, x86_64-linux-gnu)	1m 2s
Native Build (Windows arm64)	1m 5s
Native Build (Linux) (arm64, ubuntu-24.04-arm, aarch64-linux-gnu)	43s
Native Build (macOS) (x64)	40s
Native Build (macOS) (arm64)	44s
Build & Test (ubuntu-latest)	4m 19s
Build & Test (windows-latest)	7m 9s
Build & Test (macos-latest)	5m 47s
Integration Tests (macOS)	38s
Pack NuGet	2m 1s
	27m 24s

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