test(jsx): add useShortcuts unit tests

packages/jsx/src/hooks/useShortcuts.test.ts

@@ -0,0 +1,25 @@
+import { describe, it, expect } from 'vitest';
+import { registerShortcut, useShortcuts } from './useShortcuts.js';
+
+describe('useShortcuts hook', () => {
+    it('returns empty array initially or already registered shortcuts', () => {
+        const initial = useShortcuts();
+        expect(Array.isArray(initial)).toBe(true);
+    });
+
+    it('registers new shortcut and returns updated list', () => {
+        const initialLength = useShortcuts().length;
+
+        const newShortcut = {
+            key: 'ctrl+k',
+            description: 'Clear console',
+            category: 'general',
+        };
+
+        registerShortcut(newShortcut);
+
+        const updated = useShortcuts();
+        expect(updated).toHaveLength(initialLength + 1);
+        expect(updated[updated.length - 1]).toEqual(newShortcut);
+    });
+});