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>

nix/livekit-libwebrtc/0001-shared-libraries.patch

@@ -0,0 +1,17 @@
+--- a/BUILD.gn
++++ b/BUILD.gn
+@@ -143,8 +143,12 @@
+ # target_defaults and direct_dependent_settings.
+ config("common_inherited_config") {
+   defines = [ "PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII=0" ]
+-  cflags = []
+-  ldflags = []
++  cflags = [ "-fvisibility=default" ]
++  ldflags = [ "-lavutil", "-lavformat", "-lavcodec" ]
++
++  if (is_linux) {
++    ldflags += [ "-Wl,--version-script=" + rebase_path("//libwebrtc.version", root_build_dir) ]
++  }
+
+   if (rtc_objc_prefix != "") {
+     defines += [ "RTC_OBJC_TYPE_PREFIX=${rtc_objc_prefix}" ]