logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

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

crates/edit_prediction_cli/evals/zed--add-eprintln.md

@@ -0,0 +1,54 @@
++++
+repository_url = "git@github.com:zed-industries/zed"
+revision = "b7090c9fae7390a82021b994994c0f587744d96c"
++++
+
+This example shows the model's preference for making conservative predictions, and ability to place
+the cursor within the predicted output.
+
+## Edit History
+
+```diff
+--- a/crates/edit_prediction_ui/src/rate_prediction_modal.rs
++++ b/crates/edit_prediction_ui/src/rate_prediction_modal.rs
+@@ -144,7 +144,7 @@
+     fn select_next_edit(&mut self, _: &NextEdit, _: &mut Window, cx: &mut Context<Self>) {
++        epr
+         let next_index = self
+             .ep_store
+             .read(cx)
+```
+
+## Cursor Position
+
+```crates/edit_prediction_ui/src/rate_prediction_modal.rs
+    fn select_next_edit(&mut self, _: &NextEdit, _: &mut Window, cx: &mut Context<Self>) {
+        epr
+        // ^[CURSOR_POSITION]
+        let next_index = self
+            .ep_store
+            .read(cx)
+            .shown_predictions()
+            .skip(self.selected_index)
+            .enumerate()
+            .skip(1) // Skip straight to the next item
+```
+
+## Expected Patch
+
+```diff
+--- a/crates/edit_prediction_ui/src/rate_prediction_modal.rs
++++ b/crates/edit_prediction_ui/src/rate_prediction_modal.rs
+@@ -144,14 +144,14 @@
+     fn select_next_edit(&mut self, _: &NextEdit, _: &mut Window, cx: &mut Context<Self>) {
+-        epr
++        eprintln!("");
+#                   ^[CURSOR_POSITION]
+         let next_index = self
+             .ep_store
+             .read(cx)
+             .shown_predictions()
+             .skip(self.selected_index)
+             .enumerate()
+             .skip(1) // Skip straight to the next item
+```