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/credentials_provider/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "credentials_provider"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "GPL-3.0-or-later"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/credentials_provider.rs"
+
+[dependencies]
+anyhow.workspace = true
+gpui.workspace = true
+serde.workspace = true

crates/credentials_provider/LICENSE-GPL

@@ -0,0 +1 @@
+../../LICENSE-GPL

crates/credentials_provider/src/credentials_provider.rs

@@ -0,0 +1,34 @@
+use std::future::Future;
+use std::pin::Pin;
+
+use anyhow::Result;
+use gpui::AsyncApp;
+
+/// A provider for credentials.
+///
+/// Used to abstract over reading and writing credentials to some form of
+/// persistence (like the system keychain).
+pub trait CredentialsProvider: Send + Sync {
+    /// Reads the credentials from the provider.
+    fn read_credentials<'a>(
+        &'a self,
+        url: &'a str,
+        cx: &'a AsyncApp,
+    ) -> Pin<Box<dyn Future<Output = Result<Option<(String, Vec<u8>)>>> + 'a>>;
+
+    /// Writes the credentials to the provider.
+    fn write_credentials<'a>(
+        &'a self,
+        url: &'a str,
+        username: &'a str,
+        password: &'a [u8],
+        cx: &'a AsyncApp,
+    ) -> Pin<Box<dyn Future<Output = Result<()>> + 'a>>;
+
+    /// Deletes the credentials from the provider.
+    fn delete_credentials<'a>(
+        &'a self,
+        url: &'a str,
+        cx: &'a AsyncApp,
+    ) -> Pin<Box<dyn Future<Output = Result<()>> + 'a>>;
+}