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>

docs/theme/plugins.css

@@ -0,0 +1,45 @@
+kbd.keybinding {
+  background-color: var(--keybinding-bg);
+  padding: 4px 4px 6px 4px;
+  border-radius: 4px;
+  font-family: var(--mono-font);
+  display: inline-block;
+  margin: 0 2px;
+}
+
+#copy-markdown-toggle i {
+  font-weight: 500 !important;
+  -webkit-text-stroke: 0.5px currentColor;
+}
+
+.copy-toast {
+  position: fixed;
+  top: 72px;
+  right: 16px;
+  padding: 12px 16px;
+  border-radius: 4px;
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--fg);
+  background: var(--toast-bg);
+  border: 1px solid var(--toast-border);
+  z-index: 1000;
+  opacity: 0;
+  transform: translateY(-10px);
+  transition: all 0.1s ease-in-out;
+  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
+  max-width: 280px;
+}
+
+.copy-toast.success {
+  border-color: var(--toast-border-success);
+}
+
+.copy-toast.error {
+  border-color: var(--toast-border-error);
+}
+
+.copy-toast.show {
+  opacity: 1;
+  transform: translateY(0);
+}