feat: add review shortcut confirmation setting

tests/review-shortcuts.test.ts

@@ -0,0 +1,35 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import {
+	getReviewShortcutHint,
+	resolveReviewShortcutDoublePress,
+} from "../src/ui/review-shortcuts.ts";
+
+test("review shortcut double press requires the same digit twice", () => {
+	const first = resolveReviewShortcutDoublePress(2);
+	assert.equal(first.confirmed, false);
+	assert.equal(first.actionIndex, 1);
+	assert.equal(first.pendingActionIndex, 1);
+
+	const second = resolveReviewShortcutDoublePress(2, first.pendingActionIndex);
+	assert.equal(second.confirmed, true);
+	assert.equal(second.actionIndex, 1);
+	assert.equal(second.pendingActionIndex, undefined);
+});
+
+test("review shortcut double press switches pending action when digit changes", () => {
+	const first = resolveReviewShortcutDoublePress(1);
+	const second = resolveReviewShortcutDoublePress(3, first.pendingActionIndex);
+
+	assert.equal(second.confirmed, false);
+	assert.equal(second.actionIndex, 2);
+	assert.equal(second.pendingActionIndex, 2);
+});
+
+test("review shortcut hint reflects pending confirmation state", () => {
+	assert.equal(
+		getReviewShortcutHint(),
+		"Press 1, 2, or 3 twice to confirm a review action."
+	);
+	assert.equal(getReviewShortcutHint(1), "Press 2 again to Elaborate.");
+});