fix(native): name the window lich so the dock groups it under lich's icon

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - `lich quit` no longer fails with "EOF" when lich quits before answering: it waits for the port to close instead of calling the lost reply a refusal.
 - On Wayland, the native window shows the desktop's own cursor, in its theme and size, where it could show another theme. On a monitor with a smaller scale than the largest one, the cursor no longer jumps as it enters the window.
+- On Linux, the native window groups under lich's own icon in the dock, where it showed up as a separate app with a generic icon.
 
 ## [0.71.2] - 2026-10-19
 

native/cmd/lich-native/main.go

@@ -56,6 +56,7 @@ var (
 
 func main() {
 	flag.Parse()
+	app.ID = windowClass(os.Getenv)
 	rt, err := backendRuntime()
 	if err != nil {
 		log.Fatal(err)
@@ -81,6 +82,18 @@ func main() {
 	app.Main()
 }
 
+// windowClass is the Wayland app_id and X11 WM_CLASS. Gio's default, the
+// binary's name, matches no .desktop entry, so the dock shows the window as an
+// unknown app beside lich's own icon. It mirrors the web window's (main.go's
+// windowTarget): build/linux/lich.desktop claims "lich", and the dev window
+// keeps its own so compositor rules for the daily driver never capture it.
+func windowClass(getenv func(string) string) string {
+	if getenv("LICH_DEV") != "" {
+		return "lichdev"
+	}
+	return "lich"
+}
+
 type window struct {
 	ctx    context.Context
 	client *lichclient.Client

native/cmd/lich-native/windowclass_test.go

@@ -0,0 +1,27 @@
+package main
+
+import "testing"
+
+func TestWindowClass(t *testing.T) {
+	cases := []struct {
+		name string
+		dev  string
+		want string
+	}{
+		{"installed window matches lich.desktop", "", "lich"},
+		{"dev window keeps its own", "1", "lichdev"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			getenv := func(key string) string {
+				if key == "LICH_DEV" {
+					return c.dev
+				}
+				return ""
+			}
+			if got := windowClass(getenv); got != c.want {
+				t.Errorf("windowClass = %q, want %q", got, c.want)
+			}
+		})
+	}
+}