Litext: exclude AppKit menu trampoline from Mac Catalyst

[devin-ai-integration]

Summary

NSMenuItemActionTrampoline.swift is the only file in the package gated on bare #if canImport(AppKit). Under Mac Catalyst that check is true (AppKit is importable) while NSMenu/NSMenuItem/NSImage are marked unavailable, so any Catalyst target linking MarkdownView fails to compile:

'NSMenu' is unavailable in Mac Catalyst

Every other platform fork in the package is written #if canImport(UIKit) … #elseif canImport(AppKit), which already resolves to the UIKit branch on Catalyst. This aligns the one outlier:

-#if canImport(AppKit)
+#if canImport(AppKit) && !targetEnvironment(macCatalyst)

No behavior change on macOS/iOS; the trampoline is only referenced from AppKit menu code.

Link to Devin session: https://app.devin.ai/sessions/ffcab2338e3d4dbdb02ec0a942f711e9
Requested by: @gtokman

[devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
markdown-view	Ready	Preview, v0	Aug 18, 2026 3:52am