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>

crates/icons/README.md

@@ -0,0 +1,29 @@
+# Zed Icons
+
+## Guidelines
+
+Icons are a big part of Zed, and they're how we convey hundreds of actions without relying on labeled buttons.
+When introducing a new icon, it's important to ensure consistency with the existing set, which follows these guidelines:
+
+1. The SVG view box should be 16x16.
+2. For outlined icons, use a 1.2px stroke width.
+3. Not all icons are mathematically aligned; there's quite a bit of optical adjustment. However, try to keep the icon within an internal 12x12 bounding box as much as possible while ensuring proper visibility.
+4. Use the `filled` and `outlined` terminology when introducing icons that will have these two variants.
+5. Icons that are deeply contextual may have the feature context as their name prefix. For example, `ToolWeb`, `ReplPlay`, `DebugStepInto`, etc.
+6. Avoid complex layer structures in the icon SVG, like clipping masks and similar elements. When the shape becomes too complex, we recommend running the SVG through [SVGOMG](https://jakearchibald.github.io/svgomg/) to clean it up.
+
+## Sourcing
+
+Most icons are created by sourcing them from [Lucide](https://lucide.dev/).
+Then, they're modified, adjusted, cleaned up, and simplified depending on their use and overall fit with Zed.
+
+Sometimes, we may use other sources like [Phosphor](https://phosphoricons.com/), but we also design many icons completely from scratch.
+
+## Contributing
+
+To introduce a new icon, add the `.svg` file to the `assets/icon` directory and then add its corresponding item to the `icons.rs` file within the `crates` directory.
+
+- SVG files in the assets folder follow a snake_case name format.
+- Icons in the `icons.rs` file follow the PascalCase name format.
+
+Make sure to tag a member of Zed's design team so we can review and adjust any newly introduced icon.