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/vim/test_data/test_paste_visual.json

@@ -0,0 +1,51 @@
+{"Put":{"state":"The quick brown\nfox jˇumps over\nthe lazy dog"}}
+{"Key":"v"}
+{"Key":"i"}
+{"Key":"w"}
+{"Key":"y"}
+{"Get":{"state":"The quick brown\nfox ˇjumps over\nthe lazy dog","mode":"Normal"}}
+{"Key":"w"}
+{"Key":"v"}
+{"Key":"i"}
+{"Key":"w"}
+{"Key":"p"}
+{"Get":{"state":"The quick brown\nfox jumps jumpˇs\nthe lazy dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"over"}}
+{"Key":"up"}
+{"Key":"shift-v"}
+{"Key":"shift-p"}
+{"Get":{"state":"ˇover\nfox jumps jumps\nthe lazy dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"over"}}
+{"Key":"ctrl-v"}
+{"Key":"down"}
+{"Key":"down"}
+{"Key":"p"}
+{"Get":{"state":"oveˇrver\noverox jumps jumps\noverhe lazy dog","mode":"Normal"}}
+{"Put":{"state":"The quick brown\nfox juˇmps over\nthe lazy dog"}}
+{"Key":"shift-v"}
+{"Key":"d"}
+{"Get":{"state":"The quick brown\nthe laˇzy dog","mode":"Normal"}}
+{"Key":"v"}
+{"Key":"i"}
+{"Key":"w"}
+{"Key":"p"}
+{"Get":{"state":"The quick brown\nthe \nˇfox jumps over\n dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"lazy"}}
+{"Put":{"state":"The quick brown\nfox juˇmps over\nthe lazy dog"}}
+{"Key":"shift-v"}
+{"Key":"d"}
+{"Get":{"state":"The quick brown\nthe laˇzy dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"fox jumps over\n"}}
+{"Key":"k"}
+{"Key":"shift-v"}
+{"Key":"p"}
+{"Get":{"state":"ˇfox jumps over\nthe lazy dog","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"The quick brown\n"}}
+{"Put":{"state":"ˇThe quick brown\nfox jumps over\nthe lazy dog"}}
+{"Key":"y"}
+{"Key":"y"}
+{"Key":"shift-v"}
+{"Key":"j"}
+{"Key":"$"}
+{"Key":"p"}
+{"Get":{"state":"ˇThe quick brown\nthe lazy dog","mode":"Normal"}}