logiguard fork v3: full patch set on verified 8c74db0 tree

Includes prior-session patches (carry forward so the app compiles):
  - crates/gpui/build.rs: cross-compile manifest fix
  - crates/gpui/src/platform.rs: PlatformWindow::activate_with_token trait method
  - crates/gpui/src/window.rs: Window::activate_with_token public API
  - crates/gpui_linux/src/linux/wayland/window.rs: WaylandWindow::activate_with_token + activate() keyboard-serial fix

Plus the focus-serial fix:
  - serial.rs: SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; latest_serial_of()

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/title_bar/build.rs

@@ -0,0 +1,28 @@
+#![allow(clippy::disallowed_methods, reason = "build scripts are exempt")]
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(macos_sdk_26)");
+
+    #[cfg(target_os = "macos")]
+    {
+        use std::process::Command;
+
+        let output = Command::new("xcrun")
+            .args(["--sdk", "macosx", "--show-sdk-version"])
+            .output()
+            .unwrap();
+
+        let sdk_version = String::from_utf8(output.stdout).unwrap();
+        let major_version: Option<u32> = sdk_version
+            .trim()
+            .split('.')
+            .next()
+            .and_then(|v| v.parse().ok());
+
+        if let Some(major) = major_version
+            && major >= 26
+        {
+            println!("cargo:rustc-cfg=macos_sdk_26");
+        }
+    }
+}