From c4cb52d04298318f5fca71f6a6233ba6c3735f7c Mon Sep 17 00:00:00 2001
From: Ulas Kalayci <ulas.kalayci@googlemail.com>
Date: Wed, 6 May 2026 07:33:54 +0200
Subject: [PATCH] feat(nav): shared sub-tabs component for settings and kitchen

Extracts the tab-bar UI into a reusable renderSubTabs() utility
(public/utils/sub-tabs.js + public/styles/sub-tabs.css) so all
sub-module navigation shares one implementation and visual style.

- Settings: replaces template-literal <nav class="settings-tabs">
  with renderSubTabs(); tabs now show icon + label (pill-style),
  group separators via separatorBefore, panel switching via onChange
- Kitchen: renderKitchenTabsBar() becomes a thin wrapper around
  renderSubTabs(); kitchen-tabs.css keeps only layout adjustment rules
- CSS: kitchen-tab* rules removed from kitchen-tabs.css,
  settings-tab-btn* rules removed from settings.css; both now
  inherit from sub-tabs.css
- tokens.css: adds --sub-tabs-height (52px default;
  kitchen overrides to --kitchen-tabs-height: 56px)
- test-browser-loader.mjs: resolves browser-absolute /utils/*.js
  imports to public/ directory for Node test compatibility

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 public/index.html              |  1 +
 public/pages/settings.js       | 89 +++++++++++++++++----------------
 public/styles/kitchen-tabs.css | 63 ++---------------------
 public/styles/settings.css     | 83 ++-----------------------------
 public/styles/sub-tabs.css     | 75 ++++++++++++++++++++++++++++
 public/styles/tokens.css       |  1 +
 public/utils/kitchen-tabs.js   | 48 ++++--------------
 public/utils/sub-tabs.js       | 91 ++++++++++++++++++++++++++++++++++
 test-browser-loader.mjs        |  5 ++
 9 files changed, 236 insertions(+), 220 deletions(-)
 create mode 100644 public/styles/sub-tabs.css
 create mode 100644 public/utils/sub-tabs.js

diff --git a/public/index.html b/public/index.html
index dcc37e3..5423e07 100644
--- a/public/index.html
+++ b/public/index.html
@@ -42,6 +42,7 @@
   <link rel="stylesheet" href="/styles/pwa.css" />
   <link rel="stylesheet" href="/styles/layout.css" />
   <link rel="stylesheet" href="/styles/glass.css" />
+  <link rel="stylesheet" href="/styles/sub-tabs.css" />
   <link rel="stylesheet" href="/styles/kitchen-tabs.css" />
   <link rel="stylesheet" href="/styles/login.css" />
 
diff --git a/public/pages/settings.js b/public/pages/settings.js
index eb52b6f..f79ae50 100644
--- a/public/pages/settings.js
+++ b/public/pages/settings.js
@@ -9,6 +9,7 @@ import { openModal, closeModal, confirmModal } from '/components/modal.js';
 import { t, formatDate, formatTime, dateInputPlaceholder, formatDateInput, parseDateInput, isDateInputValid, getDateFormat } from '/i18n.js';
 import { esc } from '/utils/html.js';
 import { renderSettingsSidebar, renderBreadcrumb, getLastActivePage, setActivePage, findSectionAndPage } from '/utils/settings-nav.js';
+import { renderSubTabs } from '/utils/sub-tabs.js';
 import '/components/oikos-locale-picker.js';
 
 const SUPPORTED_CURRENCIES = ['AED', 'AUD', 'BRL', 'CAD', 'CHF', 'CNY', 'CZK', 'DKK', 'EUR', 'GBP', 'HUF', 'INR', 'JPY', 'NOK', 'PLN', 'RUB', 'SAR', 'SEK', 'TRY', 'UAH', 'USD'];
@@ -256,8 +257,6 @@ export async function render(container, { user }) {
     : (allowedTabs.includes(storedTab) ? storedTab : 'general');
 
   const panelHidden = (id) => id === activeTab ? '' : ' hidden';
-  const btnClass    = (id) => `settings-tab-btn${id === activeTab ? ' settings-tab-btn--active' : ''}`;
-  const btnAria     = (id) => id === activeTab ? 'true' : 'false';
 
   container.innerHTML = `
     <div class="page settings-page">
@@ -268,18 +267,6 @@ export async function render(container, { user }) {
       ${syncOk  ? `<div class="settings-banner settings-banner--success">${syncOk === 'google' ? t('settings.syncSuccessGoogle') : t('settings.syncSuccessApple')}</div>` : ''}
       ${syncErr ? `<div class="settings-banner settings-banner--error">${syncErr === 'google' ? t('settings.syncErrorGoogle') : t('settings.syncErrorApple')}</div>` : ''}
 
-      <nav class="settings-tabs" role="tablist" aria-label="${t('settings.tabsAriaLabel')}">
-        <button class="${btnClass('general')}"  role="tab" data-tab="general"  aria-selected="${btnAria('general')}">${t('settings.tabGeneral')}</button>
-        <button class="${btnClass('meals')}"    role="tab" data-tab="meals"    aria-selected="${btnAria('meals')}">${t('settings.tabMeals')}</button>
-        <button class="${btnClass('budget')}"   role="tab" data-tab="budget"   aria-selected="${btnAria('budget')}">${t('settings.tabBudget')}</button>
-        <button class="${btnClass('shopping')}" role="tab" data-tab="shopping" aria-selected="${btnAria('shopping')}">${t('settings.tabShopping')}</button>
-        <button class="${btnClass('sync')}" role="tab" data-tab="sync" aria-selected="${btnAria('sync')}" data-group="sync">${t('settings.tabSync')}</button>
-        <button class="${btnClass('account')}"  role="tab" data-tab="account"  aria-selected="${btnAria('account')}" data-group="personal">${t('settings.tabAccount')}</button>
-        ${user?.role === 'admin' ? `<button class="${btnClass('family')}" role="tab" data-tab="family" aria-selected="${btnAria('family')}" data-group="admin">${t('settings.tabFamily')}</button>` : ''}
-        ${user?.role === 'admin' ? `<button class="${btnClass('api-tokens')}" role="tab" data-tab="api-tokens" aria-selected="${btnAria('api-tokens')}" data-group="admin">${t('settings.tabApiTokens')}</button>` : ''}
-        ${user?.role === 'admin' ? `<button class="${btnClass('backup')}" role="tab" data-tab="backup" aria-selected="${btnAria('backup')}" data-group="admin">${t('settings.tabBackup')}</button>` : ''}
-      </nav>
-
       <!-- Panel: Allgemein (Design + Sprache) -->
       <div class="settings-tab-panel" data-panel="general" role="tabpanel"${panelHidden('general')}>
         <section class="settings-section">
@@ -878,6 +865,7 @@ docker cp oikos:/data/oikos-backup.db ./oikos-backup.db</code></pre>
     loadCardDAVAccounts(container, user);
   }
 
+  renderSettingsSubTabs(container, user, activeTab);
   bindEvents(container, user, users, categories, icsSubscriptions, apiTokens);
   if (window.lucide) window.lucide.createIcons();
 }
@@ -1151,12 +1139,56 @@ async function loadCardDAVAccounts(container, user) {
   }
 }
 
+// --------------------------------------------------------
+// Sub-Tab-Navigation
+// --------------------------------------------------------
+
+function buildSettingsTabs(user) {
+  const tabs = [
+    { id: 'general',    label: t('settings.tabGeneral'),    icon: 'settings'       },
+    { id: 'meals',      label: t('settings.tabMeals'),      icon: 'utensils'       },
+    { id: 'budget',     label: t('settings.tabBudget'),     icon: 'wallet'         },
+    { id: 'shopping',   label: t('settings.tabShopping'),   icon: 'shopping-cart'  },
+    { id: 'sync',       label: t('settings.tabSync'),       icon: 'refresh-cw',    separatorBefore: true },
+    { id: 'account',    label: t('settings.tabAccount'),    icon: 'user',          separatorBefore: true },
+  ];
+  if (user?.role === 'admin') {
+    tabs.push(
+      { id: 'family',     label: t('settings.tabFamily'),    icon: 'users',    separatorBefore: true },
+      { id: 'api-tokens', label: t('settings.tabApiTokens'), icon: 'key'    },
+      { id: 'backup',     label: t('settings.tabBackup'),    icon: 'database' },
+    );
+  }
+  return tabs;
+}
+
+function renderSettingsSubTabs(container, user, activeTab) {
+  const settingsPage = container.querySelector('.settings-page');
+  if (!settingsPage) return;
+
+  const lastBanner = [...settingsPage.querySelectorAll('.settings-banner')].at(-1);
+  const anchor     = lastBanner ?? settingsPage.querySelector('.page__header');
+  if (!anchor) return;
+
+  renderSubTabs(anchor, {
+    tabs:           buildSettingsTabs(user),
+    activeId:       activeTab,
+    storageKey:     SETTINGS_TAB_KEY,
+    ariaLabel:      t('settings.tabsAriaLabel'),
+    insertPosition: 'afterend',
+    onChange: (tabId) => {
+      container.querySelectorAll('[data-panel]').forEach((panel) => {
+        panel.hidden = panel.dataset.panel !== tabId;
+      });
+    },
+  });
+}
+
 // --------------------------------------------------------
 // Event-Binding
 // --------------------------------------------------------
 
 function bindEvents(container, user, users, categories, icsSubscriptions, apiTokens) {
-  bindTabEvents(container);
   bindSettingsDateInputs(container);
   bindCategoryEvents(container);
   bindIcsEvents(container, user, icsSubscriptions);
@@ -1693,33 +1725,6 @@ function bindEvents(container, user, users, categories, icsSubscriptions, apiTok
 }
 
 // --------------------------------------------------------
-// Tab-Navigation
-// --------------------------------------------------------
-
-function bindTabEvents(container) {
-  const tabList = container.querySelector('.settings-tabs');
-  if (!tabList) return;
-
-  tabList.addEventListener('click', (e) => {
-    const btn = e.target.closest('[data-tab]');
-    if (!btn) return;
-    const tab = btn.dataset.tab;
-
-    tabList.querySelectorAll('[data-tab]').forEach((b) => {
-      const active = b.dataset.tab === tab;
-      b.classList.toggle('settings-tab-btn--active', active);
-      b.setAttribute('aria-selected', String(active));
-    });
-
-    container.querySelectorAll('[data-panel]').forEach((panel) => {
-      panel.hidden = panel.dataset.panel !== tab;
-    });
-
-    try { sessionStorage.setItem(SETTINGS_TAB_KEY, tab); } catch (_) {}
-  });
-}
-
-
 function bindDeleteButtons(container, user) {
   container.querySelectorAll('[data-delete-user]').forEach((btn) => {
     btn.replaceWith(btn.cloneNode(true)); // Doppelte Listener vermeiden
diff --git a/public/styles/kitchen-tabs.css b/public/styles/kitchen-tabs.css
index c099b46..638a69b 100644
--- a/public/styles/kitchen-tabs.css
+++ b/public/styles/kitchen-tabs.css
@@ -1,66 +1,11 @@
 /* Modul: Kitchen Tabs Bar
- * Sticky Segment-Control für Mahlzeiten/Rezepte/Einkauf + Sub-Modul Layout-Fixes
+ * Layout-Fixes für Mahlzeiten/Rezepte/Einkauf bei aktiver Sub-Tab-Leiste.
+ * Tab-Styles kommen aus sub-tabs.css; hier nur Kitchen-spezifische Overrides.
  */
 
+/* Höhe auf --kitchen-tabs-height überschreiben (56px statt Standard 52px) */
 .kitchen-tabs-bar {
-  display: flex;
-  gap: var(--space-1);
-  padding: var(--space-2) var(--space-4);
-  height: var(--kitchen-tabs-height);
-  box-sizing: border-box;
-  position: sticky;
-  top: 0;
-  z-index: var(--z-sticky);
-  background-color: var(--color-bg);
-  border-bottom: 1px solid var(--color-border-subtle);
-  overflow-x: auto;
-  scrollbar-width: none;
-  -ms-overflow-style: none;
-  flex-shrink: 0;
-}
-
-.kitchen-tabs-bar::-webkit-scrollbar {
-  display: none;
-}
-
-.kitchen-tab {
-  display: inline-flex;
-  align-items: center;
-  gap: var(--space-1);
-  padding: 0 var(--space-3);
-  height: var(--target-base);
-  border-radius: var(--radius-full);
-  border: none;
-  background: transparent;
-  color: var(--color-text-secondary);
-  font-family: inherit;
-  font-size: var(--text-sm);
-  font-weight: var(--font-weight-medium);
-  cursor: pointer;
-  white-space: nowrap;
-  flex-shrink: 0;
-  transition: background-color var(--transition-fast), color var(--transition-fast);
-  -webkit-tap-highlight-color: transparent;
-}
-
-.kitchen-tab:active {
-  transform: scale(0.96);
-  transition-duration: 0.06s;
-}
-
-.kitchen-tab--active {
-  background-color: color-mix(in srgb, var(--active-module-accent, var(--color-accent)) 14%, transparent);
-  color: var(--active-module-accent, var(--color-accent));
-}
-
-.kitchen-tab__icon {
-  width: 16px;
-  height: 16px;
-  flex-shrink: 0;
-}
-
-.kitchen-tab__label {
-  line-height: 1;
+  --sub-tabs-height: var(--kitchen-tabs-height);
 }
 
 /* Mahlzeiten: sticky day-header unterhalb der Tab-Leiste */
diff --git a/public/styles/settings.css b/public/styles/settings.css
index ae2f65d..67547ad 100644
--- a/public/styles/settings.css
+++ b/public/styles/settings.css
@@ -43,89 +43,12 @@
 }
 
 /* --------------------------------------------------------
-   Tab-Navigation
+   Sub-Tab-Navigation (via shared sub-tabs.css)
    -------------------------------------------------------- */
 
-.settings-tabs {
-  display: flex;
-  flex-wrap: nowrap;
-  gap: 0;
-  overflow-x: auto;
-  scrollbar-width: none;
-  -webkit-overflow-scrolling: touch;
-  border-bottom: 1px solid var(--color-border);
+/* Abstand zwischen Tab-Leiste und erstem Panel-Inhalt */
+.settings-page .sub-tabs-bar {
   margin-bottom: var(--space-6);
-  position: sticky;
-  top: 0;
-  background: var(--color-bg);
-  z-index: 10;
-  padding-top: var(--space-1);
-}
-
-.settings-tabs::-webkit-scrollbar {
-  display: none;
-}
-
-.settings-tab-btn {
-  flex-shrink: 0;
-  padding: var(--space-3) clamp(var(--space-2), 1.3vw, var(--space-4));
-  border: none;
-  border-bottom: 2px solid transparent;
-  background: transparent;
-  color: var(--color-text-secondary);
-  font-size: var(--text-sm);
-  font-weight: var(--font-weight-medium);
-  cursor: pointer;
-  transition: color var(--transition-fast), border-color var(--transition-fast);
-  min-height: 44px;
-  white-space: nowrap;
-  margin-bottom: -1px;
-}
-
-.settings-tab-btn:hover {
-  color: var(--color-text-primary);
-}
-
-.settings-tab-btn--active {
-  color: var(--color-accent);
-  border-bottom-color: var(--color-accent);
-}
-
-/* --------------------------------------------------------
-   Visuelle Tab-Gruppierung (Vorschlag B)
-   -------------------------------------------------------- */
-
-/* Trennlinie vor Sync-Gruppe */
-.settings-tab-btn[data-group="sync"]::before {
-  content: '';
-  position: absolute;
-  left: -8px;
-  top: 20%;
-  height: 60%;
-  width: 2px;
-  background: var(--color-border);
-}
-
-/* Trennlinie vor Personal-Gruppe */
-.settings-tab-btn[data-group="personal"]::before {
-  content: '';
-  position: absolute;
-  left: -8px;
-  top: 20%;
-  height: 60%;
-  width: 2px;
-  background: var(--color-border);
-}
-
-/* Trennlinie vor Admin-Gruppe */
-.settings-tab-btn[data-group="admin"]::before {
-  content: '';
-  position: absolute;
-  left: -8px;
-  top: 20%;
-  height: 60%;
-  width: 2px;
-  background: var(--color-border);
 }
 
 /* --------------------------------------------------------
diff --git a/public/styles/sub-tabs.css b/public/styles/sub-tabs.css
new file mode 100644
index 0000000..bf1f2d5
--- /dev/null
+++ b/public/styles/sub-tabs.css
@@ -0,0 +1,75 @@
+/* Sub-Tabs Bar — shared pill-style segment control
+ * Used by kitchen modules, settings, and any future sub-module navigation.
+ * Height: --sub-tabs-height (default from tokens.css); override per context.
+ */
+
+.sub-tabs-bar {
+  display: flex;
+  align-items: center;
+  gap: var(--space-1);
+  padding: var(--space-2) var(--space-4);
+  height: var(--sub-tabs-height);
+  box-sizing: border-box;
+  position: sticky;
+  top: 0;
+  z-index: var(--z-sticky);
+  background-color: var(--color-bg);
+  border-bottom: 1px solid var(--color-border-subtle);
+  overflow-x: auto;
+  scrollbar-width: none;
+  -ms-overflow-style: none;
+  flex-shrink: 0;
+}
+
+.sub-tabs-bar::-webkit-scrollbar {
+  display: none;
+}
+
+.sub-tab {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-1);
+  padding: 0 var(--space-3);
+  height: var(--target-base);
+  border-radius: var(--radius-full);
+  border: none;
+  background: transparent;
+  color: var(--color-text-secondary);
+  font-family: inherit;
+  font-size: var(--text-sm);
+  font-weight: var(--font-weight-medium);
+  cursor: pointer;
+  white-space: nowrap;
+  flex-shrink: 0;
+  transition: background-color var(--transition-fast), color var(--transition-fast);
+  -webkit-tap-highlight-color: transparent;
+}
+
+.sub-tab:active {
+  transform: scale(0.96);
+  transition-duration: 0.06s;
+}
+
+.sub-tab--active {
+  background-color: color-mix(in srgb, var(--active-module-accent, var(--color-accent)) 14%, transparent);
+  color: var(--active-module-accent, var(--color-accent));
+}
+
+.sub-tab__icon {
+  width: 16px;
+  height: 16px;
+  flex-shrink: 0;
+}
+
+.sub-tab__label {
+  line-height: 1;
+}
+
+/* Vertical divider between tab groups */
+.sub-tabs-separator {
+  width: 1px;
+  height: 20px;
+  background: var(--color-border);
+  flex-shrink: 0;
+  margin: 0 var(--space-1);
+}
diff --git a/public/styles/tokens.css b/public/styles/tokens.css
index 4c0e7b0..cd77eca 100644
--- a/public/styles/tokens.css
+++ b/public/styles/tokens.css
@@ -351,6 +351,7 @@
   --content-max-width: 1280px;
   --content-max-width-narrow: 720px;
   --cal-hour-height: 56px;
+  --sub-tabs-height: 52px;
   --kitchen-tabs-height: 56px;
 
   /* --------------------------------------------------------
diff --git a/public/utils/kitchen-tabs.js b/public/utils/kitchen-tabs.js
index 1005480..14f6dbc 100644
--- a/public/utils/kitchen-tabs.js
+++ b/public/utils/kitchen-tabs.js
@@ -1,4 +1,5 @@
 import { t } from '/i18n.js';
+import { renderSubTabs } from '/utils/sub-tabs.js';
 
 export const KITCHEN_ROUTES = ['/meals', '/recipes', '/shopping'];
 export const KITCHEN_STORAGE_KEY = 'oikos-kitchen-tab';
@@ -23,46 +24,15 @@ export function isKitchenRoute(path) {
 }
 
 export function renderKitchenTabsBar(container, activeRoute) {
-  try {
-    sessionStorage.setItem(KITCHEN_STORAGE_KEY, activeRoute);
-  } catch { /* ignore */ }
-
   container.classList.add('has-kitchen-tabs');
 
-  const bar = document.createElement('div');
-  bar.className = 'kitchen-tabs-bar';
-  bar.setAttribute('role', 'tablist');
-  bar.setAttribute('aria-label', t('nav.kitchen'));
-
-  TABS().forEach(({ route, labelKey, icon }) => {
-    const btn = document.createElement('button');
-    btn.className = 'kitchen-tab' + (route === activeRoute ? ' kitchen-tab--active' : '');
-    btn.dataset.route = route;
-    btn.type = 'button';
-    btn.setAttribute('role', 'tab');
-    btn.setAttribute('aria-selected', route === activeRoute ? 'true' : 'false');
-
-    const i = document.createElement('i');
-    i.dataset.lucide = icon;
-    i.className = 'kitchen-tab__icon';
-    i.setAttribute('aria-hidden', 'true');
-
-    const span = document.createElement('span');
-    span.className = 'kitchen-tab__label';
-    span.textContent = t(labelKey);
-
-    btn.appendChild(i);
-    btn.appendChild(span);
-    bar.appendChild(btn);
+  renderSubTabs(container, {
+    tabs: TABS().map(({ route, labelKey, icon }) => ({ id: route, label: t(labelKey), icon })),
+    activeId: activeRoute,
+    storageKey: KITCHEN_STORAGE_KEY,
+    extraClass: 'kitchen-tabs-bar',
+    ariaLabel: t('nav.kitchen'),
+    insertPosition: 'afterbegin',
+    onChange: (route) => window.oikos?.navigate(route),
   });
-
-  bar.addEventListener('click', (e) => {
-    const btn = e.target.closest('[data-route]');
-    if (!btn || btn.dataset.route === activeRoute) return;
-    window.oikos?.navigate(btn.dataset.route);
-  });
-
-  container.insertAdjacentElement('afterbegin', bar);
-
-  if (window.lucide) window.lucide.createIcons({ el: bar });
 }
diff --git a/public/utils/sub-tabs.js b/public/utils/sub-tabs.js
new file mode 100644
index 0000000..7dac4bb
--- /dev/null
+++ b/public/utils/sub-tabs.js
@@ -0,0 +1,91 @@
+/**
+ * Shared sticky sub-tab bar (pill-style).
+ * Used by kitchen modules and settings; extend to any future sub-module nav.
+ *
+ * @param {HTMLElement} anchorEl  - element relative to which the bar is inserted
+ * @param {object}      opts
+ * @param {Array<{id: string, label: string, icon?: string, separatorBefore?: boolean}>} opts.tabs
+ * @param {string}      opts.activeId          - initially active tab id
+ * @param {Function}    opts.onChange          - called with new id on tab switch
+ * @param {string}      [opts.storageKey]      - sessionStorage key for persistence
+ * @param {string}      [opts.extraClass]      - additional CSS class on bar element
+ * @param {string}      [opts.ariaLabel]
+ * @param {InsertPosition} [opts.insertPosition='afterbegin']
+ * @returns {HTMLElement} the rendered bar element
+ */
+export function renderSubTabs(anchorEl, {
+  tabs,
+  activeId,
+  onChange,
+  storageKey,
+  extraClass,
+  ariaLabel,
+  insertPosition = 'afterbegin',
+}) {
+  let current = activeId;
+
+  if (storageKey) {
+    try { sessionStorage.setItem(storageKey, current); } catch { /* ignore */ }
+  }
+
+  const bar = document.createElement('div');
+  bar.className = 'sub-tabs-bar' + (extraClass ? ' ' + extraClass : '');
+  bar.setAttribute('role', 'tablist');
+  if (ariaLabel) bar.setAttribute('aria-label', ariaLabel);
+
+  for (const { id, label, icon, separatorBefore } of tabs) {
+    if (separatorBefore) {
+      const sep = document.createElement('span');
+      sep.className = 'sub-tabs-separator';
+      sep.setAttribute('aria-hidden', 'true');
+      bar.appendChild(sep);
+    }
+
+    const btn = document.createElement('button');
+    btn.type = 'button';
+    btn.className = 'sub-tab' + (id === current ? ' sub-tab--active' : '');
+    btn.dataset.tabId = id;
+    btn.setAttribute('role', 'tab');
+    btn.setAttribute('aria-selected', id === current ? 'true' : 'false');
+
+    if (icon) {
+      const i = document.createElement('i');
+      i.dataset.lucide = icon;
+      i.className = 'sub-tab__icon';
+      i.setAttribute('aria-hidden', 'true');
+      btn.appendChild(i);
+    }
+
+    const span = document.createElement('span');
+    span.className = 'sub-tab__label';
+    span.textContent = label;
+    btn.appendChild(span);
+
+    bar.appendChild(btn);
+  }
+
+  bar.addEventListener('click', (e) => {
+    const btn = e.target.closest('[data-tab-id]');
+    if (!btn || btn.dataset.tabId === current) return;
+
+    current = btn.dataset.tabId;
+
+    if (storageKey) {
+      try { sessionStorage.setItem(storageKey, current); } catch { /* ignore */ }
+    }
+
+    bar.querySelectorAll('[data-tab-id]').forEach((b) => {
+      const active = b.dataset.tabId === current;
+      b.classList.toggle('sub-tab--active', active);
+      b.setAttribute('aria-selected', String(active));
+    });
+
+    onChange(current);
+  });
+
+  anchorEl.insertAdjacentElement(insertPosition, bar);
+
+  if (window.lucide) window.lucide.createIcons({ el: bar });
+
+  return bar;
+}
diff --git a/test-browser-loader.mjs b/test-browser-loader.mjs
index b3e1479..04065f7 100644
--- a/test-browser-loader.mjs
+++ b/test-browser-loader.mjs
@@ -25,5 +25,10 @@ export async function resolve(specifier, context, nextResolve) {
       url: `data:text/javascript,${encodeURIComponent(STUBS[specifier])}`,
     };
   }
+  // Browser-absolute paths (/foo.js, /utils/bar.js) → public/foo.js, public/utils/bar.js
+  if (specifier.startsWith('/') && !specifier.startsWith('//')) {
+    const resolved = new URL('public' + specifier, import.meta.url).href;
+    return nextResolve(resolved, context);
+  }
   return nextResolve(specifier, context);
 }