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/threads_sidebar_right_closed.svg

@@ -0,0 +1,5 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect opacity="0.1" width="5" height="12" rx="2" transform="matrix(-1 0 0 1 14 2)" fill="#C6CAD0"/>
+<path d="M9 2V14" stroke="#C6CAD0" stroke-width="1.2"/>
+<rect x="2" y="2" width="12" height="12" rx="1.5" stroke="#C6CAD0" stroke-width="1.2"/>
+</svg>