fix(hud): accept the system language prompt on Enter

src/components/launch/HudControls.tsx

@@ -746,14 +746,28 @@ export const HudNotice = memo(function HudNotice({
 	confirmLabel,
 	onDismiss,
 	onConfirm,
+	confirmOnEnter = false,
 }: {
 	title: string;
 	description: string;
 	dismissLabel: string;
 	confirmLabel: string;
 	onDismiss: () => void;
 	onConfirm: () => void;
+	/** Enter confirms while no control has focus; a focused control keeps its own Enter. */
+	confirmOnEnter?: boolean;
 }) {
+	useEffect(() => {
+		if (!confirmOnEnter) return;
+		const handleKeyDown = (event: KeyboardEvent) => {
+			if (event.key !== "Enter" || event.repeat || event.target !== document.body) return;
+			if (event.ctrlKey || event.altKey || event.shiftKey || event.metaKey) return;
+			onConfirm();
+		};
+		window.addEventListener("keydown", handleKeyDown);
+		return () => window.removeEventListener("keydown", handleKeyDown);
+	}, [confirmOnEnter, onConfirm]);
+
 	return (
 		<div
 			data-hud-interactive="true"

src/components/launch/LaunchWindow.test.tsx

@@ -2239,6 +2239,75 @@ describe("LaunchWindow software encoder fallback notice", () => {
 		expect(recorderState.value.dismissSoftwareEncoderFallbackNotice).toHaveBeenCalledTimes(1);
 		expect(recorderState.value.dismissSoftwareEncoderFallbackNotice).toHaveBeenCalledWith(true);
 	});
+
+	it("leaves Enter alone", async () => {
+		recorderState.value.softwareEncoderFallbackNoticeVisible = true;
+
+		renderLaunchWindow();
+		await screen.findByRole("button", { name: "Got it" });
+		fireEvent.keyDown(document.body, { key: "Enter" });
+
+		expect(recorderState.value.dismissSoftwareEncoderFallbackNotice).not.toHaveBeenCalled();
+	});
+});
+
+// #1428: the prompt's buttons need the mouse, and a window with nothing focused took Enter nowhere.
+describe("LaunchWindow system language prompt", () => {
+	beforeEach(() => {
+		platformState.value = "win32";
+		resetLaunchMocks();
+		i18nState.value.systemLocaleSuggestion = "zh-CN";
+	});
+
+	afterEach(() => {
+		cleanup();
+		vi.unstubAllGlobals();
+	});
+
+	it("accepts the suggestion on Enter while no control has focus", async () => {
+		renderLaunchWindow();
+		await screen.findByRole("button", { name: "Switch to English" });
+
+		fireEvent.keyDown(document.body, { key: "Enter" });
+
+		expect(i18nState.value.acceptSystemLocaleSuggestion).toHaveBeenCalledTimes(1);
+		expect(i18nState.value.dismissSystemLocaleSuggestion).not.toHaveBeenCalled();
+	});
+
+	it("leaves Enter to a control that has focus", async () => {
+		renderLaunchWindow();
+		const keep = await screen.findByRole("button", { name: "Keep current language" });
+		const user = userEvent.setup();
+
+		keep.focus();
+		await user.keyboard("{Enter}");
+
+		expect(i18nState.value.dismissSystemLocaleSuggestion).toHaveBeenCalledTimes(1);
+		expect(i18nState.value.acceptSystemLocaleSuggestion).not.toHaveBeenCalled();
+	});
+
+	it("ignores a held Enter, and other keys", async () => {
+		renderLaunchWindow();
+		await screen.findByRole("button", { name: "Switch to English" });
+
+		fireEvent.keyDown(document.body, { key: "Enter", repeat: true });
+		fireEvent.keyDown(document.body, { key: " " });
+		fireEvent.keyDown(document.body, { key: "Enter", ctrlKey: true });
+		fireEvent.keyDown(document.body, { key: "Enter", altKey: true });
+		fireEvent.keyDown(document.body, { key: "Enter", shiftKey: true });
+		fireEvent.keyDown(document.body, { key: "Enter", metaKey: true });
+
+		expect(i18nState.value.acceptSystemLocaleSuggestion).not.toHaveBeenCalled();
+	});
+
+	it("leaves Enter alone while a popover is open", async () => {
+		renderLaunchWindow();
+		fireEvent.click(await screen.findByRole("button", { name: "Language: English" }));
+
+		fireEvent.keyDown(document.body, { key: "Enter" });
+
+		expect(i18nState.value.acceptSystemLocaleSuggestion).not.toHaveBeenCalled();
+	});
 });
 
 // #1149: sonner's default corner of the HUD window is where the bar is, so a toast covered

src/components/launch/LaunchWindow.tsx

@@ -1450,6 +1450,7 @@ export function LaunchWindow() {
 										})}
 										onDismiss={dismissSystemLocaleSuggestion}
 										onConfirm={acceptSystemLocaleSuggestion}
+										confirmOnEnter={!isPopoverOpen}
 									/>
 								)}