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/ai_onboarding/src/young_account_banner.rs

@@ -0,0 +1,22 @@
+use gpui::{IntoElement, ParentElement};
+use ui::{Banner, prelude::*};
+
+#[derive(IntoElement)]
+pub struct YoungAccountBanner;
+
+impl RenderOnce for YoungAccountBanner {
+    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
+        const YOUNG_ACCOUNT_DISCLAIMER: &str = "To prevent abuse of our service, GitHub accounts created fewer than 30 days ago are not eligible for the Pro trial. You can request an exception by reaching out to billing-support@zed.dev";
+
+        let label = div()
+            .w_full()
+            .text_sm()
+            .text_color(cx.theme().colors().text_muted)
+            .child(YOUNG_ACCOUNT_DISCLAIMER);
+
+        div()
+            .max_w_full()
+            .my_1()
+            .child(Banner::new().severity(Severity::Warning).child(label))
+    }
+}