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/language/Cargo.toml

@@ -0,0 +1,112 @@
+[package]
+name = "language"
+version = "0.1.0"
+edition.workspace = true
+publish.workspace = true
+license = "GPL-3.0-or-later"
+
+[lints]
+workspace = true
+
+[lib]
+path = "src/language.rs"
+doctest = false
+
+[features]
+test-support = [
+    "rand",
+    "collections/test-support",
+    "lsp/test-support",
+    "text/test-support",
+    "tree-sitter-rust",
+    "tree-sitter-python",
+    "tree-sitter-typescript",
+    "tree-sitter-md",
+    "settings/test-support",
+    "util/test-support",
+]
+
+[dependencies]
+anyhow.workspace = true
+async-trait.workspace = true
+clock.workspace = true
+collections.workspace = true
+ec4rs.workspace = true
+encoding_rs.workspace = true
+fs.workspace = true
+futures.workspace = true
+futures-lite.workspace = true
+fuzzy.workspace = true
+globset.workspace = true
+gpui.workspace = true
+http_client.workspace = true
+imara-diff.workspace = true
+language_core.workspace = true
+itertools.workspace = true
+log.workspace = true
+lsp.workspace = true
+parking_lot.workspace = true
+postage.workspace = true
+rand = { workspace = true, optional = true }
+regex.workspace = true
+rpc.workspace = true
+semver.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+settings.workspace = true
+shellexpand.workspace = true
+smallvec.workspace = true
+streaming-iterator.workspace = true
+strsim.workspace = true
+sum_tree.workspace = true
+task.workspace = true
+text.workspace = true
+theme.workspace = true
+toml.workspace = true
+tracing.workspace = true
+tree-sitter-md = { workspace = true, optional = true }
+tree-sitter-python = { workspace = true, optional = true }
+tree-sitter-rust = { workspace = true, optional = true }
+tree-sitter-typescript = { workspace = true, optional = true }
+tree-sitter.workspace = true
+unicase = "2.6"
+util.workspace = true
+watch.workspace = true
+zlog.workspace = true
+ztracing.workspace = true
+diffy = "0.4.2"
+
+[dev-dependencies]
+collections = { workspace = true, features = ["test-support"] }
+ctor.workspace = true
+gpui = { workspace = true, features = ["test-support"] }
+indoc.workspace = true
+lsp = { workspace = true, features = ["test-support"] }
+pretty_assertions.workspace = true
+rand.workspace = true
+settings = { workspace = true, features = ["test-support"] }
+text = { workspace = true, features = ["test-support"] }
+http_client = { workspace = true, features = ["test-support"] }
+tree-sitter-elixir.workspace = true
+tree-sitter-embedded-template.workspace = true
+tree-sitter-heex.workspace = true
+tree-sitter-html.workspace = true
+tree-sitter-json.workspace = true
+tree-sitter-md.workspace = true
+tree-sitter-python.workspace = true
+tree-sitter-ruby.workspace = true
+tree-sitter-rust.workspace = true
+tree-sitter-typescript.workspace = true
+toml.workspace = true
+unindent.workspace = true
+util = { workspace = true, features = ["test-support"] }
+zlog.workspace = true
+criterion.workspace = true
+theme_settings.workspace = true
+
+[[bench]]
+name = "highlight_map"
+harness = false
+
+[package.metadata.cargo-machete]
+ignored = ["tracing"]