## Summary This PR aligns split-pane click behavior across macOS and GTK when focus changes due to click. When a left-click is used to transfer focus (window activation or switching to another split), Ghostty now treats that click as focus-only and suppresses forwarding mouse press/release events for that focus-transfer click. ## Changes 1. macOS: suppress focus-transfer left mouse-down and matching mouse-up in `SurfaceView_AppKit.swift`. 1. GTK: suppress focus-transfer left mouse-down and matching mouse-up in `src/apprt/gtk/class/surface.zig`. 1. macOS: defer key-window focus sync to next runloop tick to reduce transient focus churn in `BaseTerminalController.swift`. 1. macOS build/lint: exclude generated/dependency paths from SwiftLint during build in `.swiftlint.yml` and `Ghostty.xcodeproj/project.pbxproj`. ## Behavior 1. Focus-transfer split clicks are now focus-only on both macOS and GTK. 1. Matching release is also suppressed for those clicks, avoiding release-without-press sequences. 1. Platform behavior is consistent for split focus transitions. ## Validation 1. Built macOS target with `xcodebuild -target Ghostty -configuration Debug -arch arm64`. 1. Ran targeted Zig test command `zig build test -Dtest-filter=computeFraction`. 1. Ran format/lint for touched files (`swiftlint lint --fix`, `zig fmt`). 4. Build and (human) tested click scenarios on macOS ## AI Disclosure AI-assisted. Thread: https://ampcode.com/threads/T-019cb9fe-b11b-753f-99e7-8ecc52b73ec4