logiguard fork v2: patched GPUI on verified 8c74db0 tree

Rebuilt from the exact zed-industries/zed @ 8c74db00c4053d6c0a9037863d7bd048658da4ca
tree (previous orphan was based on a stale/wrong fetch). Same 3-file patch:
  - 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)

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

assets/icons/exit.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M10.437 11.0461L13.4831 8L10.437 4.95392" stroke="black" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M13 8L8 8" stroke="black" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round"/>
+<path d="M6.6553 13.4659H4.21843C3.89528 13.4659 3.58537 13.3375 3.35687 13.109C3.12837 12.8805 3 12.5706 3 12.2475V3.71843C3 3.39528 3.12837 3.08537 3.35687 2.85687C3.58537 2.62837 3.89528 2.5 4.21843 2.5H6.6553" stroke="black" stroke-width="1.2" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>