feat: add kitchen-tabs utility, CSS, token and test

test-kitchen-tabs.js

@@ -0,0 +1,63 @@
+/**
+ * Tests: Kitchen-Tabs Utility (pure functions)
+ * Läuft mit: node --loader ./test-browser-loader.mjs test-kitchen-tabs.js
+ */
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+
+const { KITCHEN_ROUTES, KITCHEN_STORAGE_KEY, getLastKitchenRoute, isKitchenRoute } = await (async () => {
+  global.window = { oikos: null };
+  global.document = {
+    createElement: () => ({
+      className: '', dataset: {}, style: {},
+      setAttribute() {}, appendChild() {},
+      classList: { add() {}, toggle() {} },
+      insertAdjacentElement() {},
+      addEventListener() {},
+    }),
+  };
+  const storage = {
+    _d: {},
+    getItem(k) { return this._d[k] ?? null; },
+    setItem(k, v) { this._d[k] = v; },
+  };
+  global.sessionStorage = storage;
+  global.t = (k) => k;
+  return import('./public/utils/kitchen-tabs.js');
+})();
+
+test('KITCHEN_ROUTES enthält alle drei Sub-Routen', () => {
+  assert.deepEqual(KITCHEN_ROUTES, ['/meals', '/recipes', '/shopping']);
+});
+
+test('KITCHEN_STORAGE_KEY ist korrekt', () => {
+  assert.equal(KITCHEN_STORAGE_KEY, 'oikos-kitchen-tab');
+});
+
+test('getLastKitchenRoute: Standardwert /meals wenn kein Storage-Eintrag', () => {
+  global.sessionStorage._d = {};
+  assert.equal(getLastKitchenRoute(), '/meals');
+});
+
+test('getLastKitchenRoute: gibt gespeicherte Route zurück', () => {
+  global.sessionStorage._d = { 'oikos-kitchen-tab': '/recipes' };
+  assert.equal(getLastKitchenRoute(), '/recipes');
+});
+
+test('getLastKitchenRoute: ignoriert ungültige gespeicherte Route', () => {
+  global.sessionStorage._d = { 'oikos-kitchen-tab': '/admin' };
+  assert.equal(getLastKitchenRoute(), '/meals');
+});
+
+test('isKitchenRoute: erkennt Kitchen-Routen', () => {
+  assert.equal(isKitchenRoute('/meals'), true);
+  assert.equal(isKitchenRoute('/recipes'), true);
+  assert.equal(isKitchenRoute('/shopping'), true);
+});
+
+test('isKitchenRoute: lehnt Nicht-Kitchen-Routen ab', () => {
+  assert.equal(isKitchenRoute('/tasks'), false);
+  assert.equal(isKitchenRoute('/'), false);
+  assert.equal(isKitchenRoute('/calendar'), false);
+  assert.equal(isKitchenRoute(''), false);
+});