logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - 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)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

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

docs/src/languages/nim.md

@@ -0,0 +1,31 @@
+---
+title: Nim
+description: "Configure Nim language support in Zed, including language servers, formatting, and debugging."
+---
+
+# Nim
+
+Nim language support in Zed is provided by the community-maintained [Nim extension](https://github.com/foxoman/zed-nim).
+Report issues to: [https://github.com/foxoman/zed-nim/issues](https://github.com/foxoman/zed-nim/issues)
+
+- Tree-sitter: [alaviss/tree-sitter-nim](https://github.com/alaviss/tree-sitter-nim)
+- Language Server: [nim-lang/langserver](https://github.com/nim-lang/langserver)
+
+## Formatting
+
+To use [arnetheduck/nph](https://github.com/arnetheduck/nph) as a formatter, follow the [nph installation instructions](https://github.com/arnetheduck/nph?tab=readme-ov-file#installation).
+
+Configure formatting in Settings ({#kb zed::OpenSettings}) under Languages > Nim, or add to your settings file:
+
+```json [settings]
+  "languages": {
+    "Nim": {
+      "formatter": {
+        "external": {
+          "command": "nph",
+          "arguments": ["-"]
+        }
+      }
+    }
+  }
+```