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>

.cargo/collab-config.toml

@@ -0,0 +1,5 @@
+# This file is used to build collab in a Docker image.
+# In particular, we don't use clang.
+[build]
+# v0 mangling scheme provides more detailed backtraces around closures
+rustflags = ["-C", "symbol-mangling-version=v0", "--cfg", "tokio_unstable"]