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/.doc-examples/simple-feature.md

@@ -0,0 +1,81 @@
+<!--
+  GOLD STANDARD EXAMPLE: Simple Feature / Overview Documentation
+
+  This example demonstrates concise documentation for a feature overview
+  or navigation guide.
+
+  Key patterns to note:
+  - Anchor IDs on all sections
+  - Brief opening paragraph explains what this covers
+  - Each section is concise (1-2 paragraphs max)
+  - Links to detailed docs for each feature
+  - Quick reference table at the end
+  - Uses {#kb ...} syntax for all keybindings
+-->
+
+---
+
+title: Finding and Navigating Code - Zed
+description: Navigate your codebase in Zed with file finder, project search, go to definition, symbol search, and the command palette.
+
+---
+
+# Finding & Navigating
+
+Zed provides several ways to move around your codebase quickly. Here's an overview of the main navigation tools.
+
+## Command Palette {#command-palette}
+
+The Command Palette ({#kb command_palette::Toggle}) is your gateway to almost everything in Zed. Type a few characters to filter commands, then press Enter to execute.
+
+[Learn more about the Command Palette →](./command-palette.md)
+
+## File Finder {#file-finder}
+
+Open any file in your project with {#kb file_finder::Toggle}. Type part of the filename or path to narrow results.
+
+## Project Search {#project-search}
+
+Search across all files with {#kb pane::DeploySearch}. Results appear in a [multibuffer](./multibuffers.md), letting you edit matches in place.
+
+## Go to Definition {#go-to-definition}
+
+Jump to where a symbol is defined with {#kb editor::GoToDefinition} (or `Cmd+Click` / `Ctrl+Click`). If there are multiple definitions, they open in a multibuffer.
+
+## Go to Symbol {#go-to-symbol}
+
+- **Current file:** {#kb outline::Toggle} opens an outline of symbols in the active file
+- **Entire project:** {#kb project_symbols::Toggle} searches symbols across all files
+
+## Outline Panel {#outline-panel}
+
+The Outline Panel ({#kb outline_panel::ToggleFocus}) shows a persistent tree view of symbols in the current file. It's especially useful with [multibuffers](./multibuffers.md) for navigating search results or diagnostics.
+
+[Learn more about the Outline Panel →](./outline-panel.md)
+
+## Tab Switcher {#tab-switcher}
+
+Quickly switch between open tabs with {#kb tab_switcher::Toggle}. Tabs are sorted by recent use—keep holding Ctrl and press Tab to cycle through them.
+
+[Learn more about the Tab Switcher →](./tab-switcher.md)
+
+## Quick Reference {#quick-reference}
+
+| Task              | Keybinding                       |
+| ----------------- | -------------------------------- |
+| Command Palette   | {#kb command_palette::Toggle}    |
+| Open file         | {#kb file_finder::Toggle}        |
+| Project search    | {#kb pane::DeploySearch}         |
+| Go to definition  | {#kb editor::GoToDefinition}     |
+| Find references   | {#kb editor::FindAllReferences}  |
+| Symbol in file    | {#kb outline::Toggle}            |
+| Symbol in project | {#kb project_symbols::Toggle}    |
+| Outline Panel     | {#kb outline_panel::ToggleFocus} |
+| Tab Switcher      | {#kb tab_switcher::Toggle}       |
+
+## See Also {#see-also}
+
+- [Command Palette](./command-palette.md) — Full command palette documentation
+- [Multibuffers](./multibuffers.md) — Edit multiple files simultaneously
+- [Outline Panel](./outline-panel.md) — Symbol tree view
+- [Tab Switcher](./tab-switcher.md) — Switch between open files