feat(ui): quit on last macOS window close when opted in

[proggeramlug]

Summary

Add quitOnLastWindowClose?: boolean to App({...}). The native compiler forwards the option before the app body is attached. On macOS, the application delegate answers applicationShouldTerminateAfterLastWindowClosed: from this opt-in flag; its default remains false, so a closed app can still be reopened from the Dock. GTK4 and Windows already end their application loops on window close, and the non-desktop backends accept the option as a no-op.

This gives macOS apps a way to terminate when the user closes the last window without a window handle or close callback. applicationWillTerminate: continues to run through AppKit's normal termination path.

Verification

• cargo check -p perry-ui-macos --lib passed on macOS.
• cargo test -p perry-codegen --test app_window_config_options -- --test-threads=1 passed: 5 tests, including presence and ordering of the new setter and omission when the option is absent.
• cargo fmt --all -- --check, scripts/check_file_size.sh, and git diff --check passed.

A manual window-close run was not performed.

Closes #10841.

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📥 Commits

Reviewing files that changed from the base of the PR and between c1569e2 and bc6abd4.

📒 Files selected for processing (13)

• changelog.d/10988-quit-on-last-window-close.md
• crates/perry-codegen/src/lower_call/native/native_ui_appshell_branch.rs
• crates/perry-codegen/tests/app_window_config_options.rs
• crates/perry-ui-android/src/ffi/tabbar_layout.rs
• crates/perry-ui-gtk4/src/ffi/app_window.rs
• crates/perry-ui-ios/src/ffi/dialogs_lifecycle.rs
• crates/perry-ui-macos/src/app.rs
• crates/perry-ui-macos/src/lib_ffi/core_widgets.rs
• crates/perry-ui-tvos/src/ffi/app_keychain.rs
• crates/perry-ui-visionos/src/ffi_system.rs
• crates/perry-ui-watchos/src/lib.rs
• crates/perry-ui-windows/src/ffi/app_window.rs
• types/perry/ui/index.d.ts

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[proggeramlug]

Landed on main in merge train 258 (#11078, v0.5.1641), main e27f0a068a.

Carried at head bc6abd447a. CI on the train head was fully green — 22 jobs, zero failures, the first train since the public-baseline artifact was regenerated, so no known-red line to read past.

This train was bisect-verified: after an earlier 35-PR assembly hit five gap regressions, the lowering-touching PRs were split into probes, and this set (#11070) came back with all six gap shards clean while the other half reproduced all five.

Trains rebase-merge, so commits get new SHAs and GitHub cannot mark this merged. Closed as landed.