feat(ui): Custom Dialog-System, Onboarding und Backup-Reminder

- HellionDialog.alert/confirm ersetzt alle nativen confirm() und alert() Aufrufe
- 6-stufiger Onboarding-Flow beim ersten Start (Boards, Themes, Features, Backup)
- Backup-Reminder erinnert alle 7 Tage an JSON-Export
- innerHTML komplett durch createElement/createElementNS ersetzt (XSS-Schutz)
- Drag & Drop Inline-Styles durch CSS-Klassen ersetzt

src/js/app.js

@@ -19,6 +19,54 @@ async function init() {
   initStickyNote();
   initDataButtons();
   Store.checkQuota();
+
+  // Onboarding beim ersten Start
+  const onboardingDone = await Store.get('onboardingDone');
+  if (!onboardingDone) {
+    Onboarding.start();
+  } else {
+    // Backup-Reminder (nur wenn Onboarding schon durch ist)
+    await checkBackupReminder();
+  }
+}
+
+// ---- BACKUP REMINDER ----
+const BACKUP_INTERVAL_MS = 7 * 24 * 60 * 60 * 1000; // 7 Tage
+
+async function checkBackupReminder() {
+  const lastReminder = await Store.get('lastBackupReminder');
+  const now = Date.now();
+
+  // Beim allerersten Mal: Timestamp setzen, aber noch nicht nerven
+  if (!lastReminder) {
+    await Store.set('lastBackupReminder', now);
+    return;
+  }
+
+  if (now - lastReminder < BACKUP_INTERVAL_MS) return;
+
+  // Nur erinnern wenn es Boards gibt die sich lohnen zu sichern
+  if (boards.length === 0) return;
+
+  const doBackup = await HellionDialog.confirm(
+    'Du hast seit über einer Woche kein Backup gemacht. Beim Löschen der Browserdaten gehen deine Boards verloren. Jetzt sichern?',
+    { type: 'warning', title: 'Backup-Erinnerung', confirmText: 'Jetzt sichern', cancelText: 'Später' }
+  );
+
+  if (doBackup) {
+    // JSON-Export auslösen (gleiche Logik wie btnExportJSON)
+    const data = { version: '1.5.2', exported: new Date().toISOString(), boards, settings };
+    const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
+    const url  = URL.createObjectURL(blob);
+    const a    = document.createElement('a');
+    a.href = url;
+    a.download = 'hellion-newtab-backup-' + new Date().toISOString().slice(0, 10) + '.json';
+    a.click();
+    URL.revokeObjectURL(url);
+  }
+
+  // Timestamp immer aktualisieren (egal ob gesichert oder "Später")
+  await Store.set('lastBackupReminder', now);
 }
 
 // ---- CLOCK & DATE ----
@@ -50,12 +98,18 @@ function bindGlobalEvents() {
     const file = e.target.files[0];
     if (!file) return;
     const imported = parseBookmarkHtml(await file.text());
-    if (imported.length === 0) { alert('Keine Bookmarks gefunden.'); return; }
+    if (imported.length === 0) {
+      await HellionDialog.alert('Keine Bookmarks in dieser Datei gefunden.', { type: 'warning', title: 'Import' });
+      return;
+    }
     boards = [...boards, ...imported];
     await saveBoards();
     renderBoards();
     e.target.value = '';
-    alert(`✓ ${imported.length} Board(s) mit ${imported.reduce((s,b) => s + b.bookmarks.length, 0)} Bookmarks importiert.`);
+    await HellionDialog.alert(
+      `${imported.length} Board(s) mit ${imported.reduce((s,b) => s + b.bookmarks.length, 0)} Bookmarks importiert.`,
+      { type: 'success', title: 'Import erfolgreich' }
+    );
   });
 
   // Add Board Modal
@@ -86,7 +140,7 @@ function bindGlobalEvents() {
     const url   = document.getElementById('newBmUrl').value.trim();
     const desc  = document.getElementById('newBmDesc').value.trim();
     if (!title || !url) return;
-    try { new URL(url); } catch { alert('Ungültige URL. Bitte mit https:// beginnen.'); return; }
+    try { new URL(url); } catch { await HellionDialog.alert('Ungültige URL. Bitte mit https:// beginnen.', { type: 'warning', title: 'URL ungültig' }); return; }
     const board = boards.find(b => b.id === pendingBookmarkBoardId);
     if (!board) return;
     board.bookmarks.push({ id: uid(), title, url, desc });

src/js/boards.js

@@ -6,16 +6,67 @@
 let pendingBookmarkBoardId = null;
 let pendingRenameCallback  = null;
 
+const SVG_NS = 'http://www.w3.org/2000/svg';
+
+/**
+ * Erzeugt ein SVG-Element mit Attributen und Kinder-Elementen.
+ * @param {string} tag - SVG-Tag (z.B. 'svg', 'circle', 'line')
+ * @param {Object} attrs - Attribute als Key-Value
+ * @param {Array} children - Kind-Elemente
+ * @returns {SVGElement}
+ */
+function svgEl(tag, attrs, children) {
+  const el = document.createElementNS(SVG_NS, tag);
+  if (attrs) {
+    for (const [k, v] of Object.entries(attrs)) el.setAttribute(k, v);
+  }
+  if (children) {
+    for (const child of children) el.appendChild(child);
+  }
+  return el;
+}
+
+/** Erzeugt das 6-Punkt Drag-Handle SVG */
+function createDragHandleSvg() {
+  return svgEl('svg', { width: '10', height: '14', viewBox: '0 0 10 14', fill: 'currentColor' }, [
+    svgEl('circle', { cx: '2', cy: '2', r: '1.5' }),
+    svgEl('circle', { cx: '8', cy: '2', r: '1.5' }),
+    svgEl('circle', { cx: '2', cy: '7', r: '1.5' }),
+    svgEl('circle', { cx: '8', cy: '7', r: '1.5' }),
+    svgEl('circle', { cx: '2', cy: '12', r: '1.5' }),
+    svgEl('circle', { cx: '8', cy: '12', r: '1.5' }),
+  ]);
+}
+
+/** Erzeugt das Plus-Icon SVG */
+function createPlusSvg() {
+  return svgEl('svg', { width: '11', height: '11', viewBox: '0 0 24 24', fill: 'none', stroke: 'currentColor', 'stroke-width': '2' }, [
+    svgEl('line', { x1: '12', y1: '5', x2: '12', y2: '19' }),
+    svgEl('line', { x1: '5', y1: '12', x2: '19', y2: '12' }),
+  ]);
+}
+
 // ---- RENDER ----
 function renderBoards() {
   const wrapper = document.getElementById('boardsWrapper');
-  wrapper.innerHTML = '';
+  wrapper.replaceChildren();
 
   if (boards.length === 0) {
-    wrapper.innerHTML = `<div class="empty-state">
-      No boards yet. Click <strong style="color:var(--accent)">+ Board</strong> to create one,
-      or use <strong style="color:var(--accent)">Import</strong> to load your browser bookmarks.
-    </div>`;
+    const empty = document.createElement('div');
+    empty.className = 'empty-state';
+
+    const boardStrong = document.createElement('strong');
+    boardStrong.className = 'accent-text';
+    boardStrong.textContent = '+ Board';
+
+    const importStrong = document.createElement('strong');
+    importStrong.className = 'accent-text';
+    importStrong.textContent = 'Import';
+
+    empty.append(
+      'No boards yet. Click ', boardStrong, ' to create one, or use ', importStrong, ' to load your browser bookmarks.'
+    );
+    wrapper.appendChild(empty);
     return;
   }
 
@@ -31,43 +82,59 @@ function createBoardEl(board) {
   // Header
   const header = document.createElement('div');
   header.className = 'board-header';
-  header.innerHTML = `
-    <span class="board-drag-handle" title="Board verschieben">
-      <svg width="10" height="14" viewBox="0 0 10 14" fill="currentColor">
-        <circle cx="2" cy="2" r="1.5"/><circle cx="8" cy="2" r="1.5"/>
-        <circle cx="2" cy="7" r="1.5"/><circle cx="8" cy="7" r="1.5"/>
-        <circle cx="2" cy="12" r="1.5"/><circle cx="8" cy="12" r="1.5"/>
-      </svg>
-    </span>
-    <span class="board-title" title="${escHtml(board.title)}">${escHtml(board.title)}</span>
-    <div class="board-actions">
-      <button class="board-action-btn btn-blur-board"   title="${board.blurred ? 'Unblur' : 'Blur (privat)'}">🔒</button>
-      <button class="board-action-btn btn-rename-board" title="Umbenennen">✎</button>
-      <button class="board-action-btn btn-delete-board" title="Löschen">✕</button>
-    </div>
-  `;
+
+  const dragHandle = document.createElement('span');
+  dragHandle.className = 'board-drag-handle';
+  dragHandle.title = 'Board verschieben';
+  dragHandle.appendChild(createDragHandleSvg());
+
+  const titleSpanHeader = document.createElement('span');
+  titleSpanHeader.className = 'board-title';
+  titleSpanHeader.title = board.title;
+  titleSpanHeader.textContent = board.title;
+
+  const actions = document.createElement('div');
+  actions.className = 'board-actions';
+
+  const btnBlur = document.createElement('button');
+  btnBlur.className = 'board-action-btn btn-blur-board';
+  btnBlur.title = board.blurred ? 'Unblur' : 'Blur (privat)';
+  btnBlur.textContent = '\uD83D\uDD12';
+
+  const btnRename = document.createElement('button');
+  btnRename.className = 'board-action-btn btn-rename-board';
+  btnRename.title = 'Umbenennen';
+  btnRename.textContent = '\u270E';
+
+  const btnDelete = document.createElement('button');
+  btnDelete.className = 'board-action-btn btn-delete-board';
+  btnDelete.title = 'Löschen';
+  btnDelete.textContent = '\u2715';
+
+  actions.append(btnBlur, btnRename, btnDelete);
+  header.append(dragHandle, titleSpanHeader, actions);
 
   // Blur-Overlay
   const blurOverlay = document.createElement('div');
   blurOverlay.className = 'board-blur-overlay';
   div.appendChild(blurOverlay);
 
-  header.querySelector('.btn-blur-board').addEventListener('click', async e => {
+  btnBlur.addEventListener('click', async e => {
     e.stopPropagation();
     board.blurred = !board.blurred;
     div.classList.toggle('blurred', board.blurred);
-    e.currentTarget.title = board.blurred ? 'Unblur' : 'Blur (privat)';
+    btnBlur.title = board.blurred ? 'Unblur' : 'Blur (privat)';
     await saveBoards();
   });
 
   blurOverlay.addEventListener('click', async () => {
     board.blurred = false;
     div.classList.remove('blurred');
-    header.querySelector('.btn-blur-board').title = 'Blur (privat)';
+    btnBlur.title = 'Blur (privat)';
     await saveBoards();
   });
 
-  header.querySelector('.btn-rename-board').addEventListener('click', e => {
+  btnRename.addEventListener('click', e => {
     e.stopPropagation();
     openRenameModal(board.title, async newName => {
       if (!newName.trim()) return;
@@ -77,11 +144,16 @@ function createBoardEl(board) {
     });
   });
 
-  header.querySelector('.btn-delete-board').addEventListener('click', e => {
+  btnDelete.addEventListener('click', async e => {
     e.stopPropagation();
-    if (confirm(`Board "${board.title}" löschen?`)) {
+    const ok = await HellionDialog.confirm(
+      `Board "${board.title}" wirklich löschen?`,
+      { type: 'danger', title: 'Board löschen', confirmText: 'Löschen' }
+    );
+    if (ok) {
       boards = boards.filter(b => b.id !== board.id);
-      saveBoards().then(renderBoards);
+      await saveBoards();
+      renderBoards();
     }
   });
 
@@ -127,7 +199,8 @@ function createBoardEl(board) {
   // Add Bookmark
   const addBtn = document.createElement('button');
   addBtn.className = 'add-bm-btn';
-  addBtn.innerHTML = `<svg width="11" height="11" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><line x1="12" y1="5" x2="12" y2="19"/><line x1="5" y1="12" x2="19" y2="12"/></svg> Add link`;
+  addBtn.appendChild(createPlusSvg());
+  addBtn.append(' Add link');
   addBtn.addEventListener('click', () => openAddBookmarkModal(board.id));
   div.appendChild(addBtn);
 
@@ -148,13 +221,12 @@ function createBmEl(bm) {
   favicon.height = 14;
   favicon.src = getFaviconUrl(bm.url);
   favicon.addEventListener('error', function() {
-    this.style.display = 'none';
-    this.nextElementSibling.style.display = 'flex';
+    this.classList.add('hidden');
+    this.nextElementSibling.classList.remove('hidden');
   });
 
   const fallback = document.createElement('div');
-  fallback.className = 'bm-favicon-fallback';
-  fallback.style.display = 'none';
+  fallback.className = 'bm-favicon-fallback hidden';
   fallback.textContent = bm.title.charAt(0).toUpperCase();
 
   const textDiv = document.createElement('div');

src/js/data.js

@@ -11,7 +11,7 @@ function initDataButtons() {
 
   // Export
   btnExport.addEventListener('click', () => {
-    const data = { version: '1.2.0', exported: new Date().toISOString(), boards, settings };
+    const data = { version: '1.5.2', exported: new Date().toISOString(), boards, settings };
     const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
     const url  = URL.createObjectURL(blob);
     const a    = document.createElement('a');
@@ -42,13 +42,20 @@ function initDataButtons() {
         return true;
       });
       if (validBoards.length === 0) throw new Error('Keine gültigen Boards gefunden');
-      if (!confirm(`${validBoards.length} Boards importieren? Bestehende Daten bleiben erhalten.`)) return;
+      const ok = await HellionDialog.confirm(
+        `${validBoards.length} Boards importieren? Bestehende Daten bleiben erhalten.`,
+        { type: 'info', title: 'JSON Import' }
+      );
+      if (!ok) return;
       boards = [...boards, ...validBoards];
       await saveBoards();
       renderBoards();
-      alert(`✓ ${validBoards.length} Board(s) importiert.`);
+      await HellionDialog.alert(
+        `${validBoards.length} Board(s) erfolgreich importiert.`,
+        { type: 'success', title: 'Import erfolgreich' }
+      );
     } catch (err) {
-      alert('Fehler beim Import: ' + err.message);
+      await HellionDialog.alert('Fehler beim Import: ' + err.message, { type: 'danger', title: 'Import fehlgeschlagen' });
     }
     e.target.value = '';
   });

src/js/dialog.js

@@ -0,0 +1,154 @@
+/* =============================================
+   HELLION NEWTAB — dialog.js
+   Custom Dialog System (ersetzt native alert/confirm)
+   ============================================= */
+
+const HellionDialog = {
+  /** SVG-Icons je nach Dialog-Typ */
+  _icons: {
+    info: '<circle cx="12" cy="12" r="10"/><line x1="12" y1="16" x2="12" y2="12"/><line x1="12" y1="8" x2="12.01" y2="8"/>',
+    success: '<path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"/><polyline points="22 4 12 14.01 9 11.01"/>',
+    warning: '<path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"/><line x1="12" y1="9" x2="12" y2="13"/><line x1="12" y1="17" x2="12.01" y2="17"/>',
+    danger: '<circle cx="12" cy="12" r="10"/><line x1="15" y1="9" x2="9" y2="15"/><line x1="9" y1="9" x2="15" y2="15"/>'
+  },
+
+  /**
+   * Erzeugt das SVG-Icon-Element
+   * @param {string} type - info | success | warning | danger
+   * @returns {SVGElement}
+   */
+  _createIcon(type) {
+    const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
+    svg.setAttribute('width', '20');
+    svg.setAttribute('height', '20');
+    svg.setAttribute('viewBox', '0 0 24 24');
+    svg.setAttribute('fill', 'none');
+    svg.setAttribute('stroke', 'currentColor');
+    svg.setAttribute('stroke-width', '2');
+    svg.setAttribute('stroke-linecap', 'round');
+    svg.setAttribute('stroke-linejoin', 'round');
+    svg.className.baseVal = 'dialog-icon type-' + type;
+    // SVG-Pfade müssen per innerHTML gesetzt werden (kein User-Input, nur statische Pfade)
+    svg.innerHTML = this._icons[type] || this._icons.info;
+    return svg;
+  },
+
+  /**
+   * Erstellt und zeigt einen Dialog
+   * @param {Object} config
+   * @returns {Promise<boolean>}
+   */
+  _show(config) {
+    return new Promise(resolve => {
+      const overlay = document.createElement('div');
+      overlay.className = 'dialog-overlay';
+
+      const box = document.createElement('div');
+      box.className = 'dialog-box';
+
+      // Header
+      const header = document.createElement('div');
+      header.className = 'dialog-header';
+      header.appendChild(this._createIcon(config.type));
+      const titleSpan = document.createElement('span');
+      titleSpan.textContent = config.title;
+      header.appendChild(titleSpan);
+
+      // Body
+      const body = document.createElement('div');
+      body.className = 'dialog-body';
+      body.textContent = config.message;
+
+      // Actions
+      const actions = document.createElement('div');
+      actions.className = 'dialog-actions';
+
+      function cleanup(result) {
+        overlay.classList.remove('active');
+        document.removeEventListener('keydown', keyHandler);
+        setTimeout(() => overlay.remove(), 200);
+        resolve(result);
+      }
+
+      // Cancel-Button (nur bei confirm)
+      if (config.isConfirm) {
+        const cancelBtn = document.createElement('button');
+        cancelBtn.className = 'btn-secondary';
+        cancelBtn.textContent = config.cancelText;
+        cancelBtn.addEventListener('click', () => cleanup(false));
+        actions.appendChild(cancelBtn);
+      }
+
+      // Confirm/OK-Button
+      const confirmBtn = document.createElement('button');
+      confirmBtn.className = config.type === 'danger' && config.isConfirm ? 'btn-danger' : 'btn-primary';
+      confirmBtn.textContent = config.confirmText;
+      confirmBtn.addEventListener('click', () => cleanup(config.isConfirm ? true : undefined));
+      actions.appendChild(confirmBtn);
+
+      box.append(header, body, actions);
+      overlay.appendChild(box);
+
+      // Overlay-Klick schließt
+      overlay.addEventListener('click', e => {
+        if (e.target === overlay) cleanup(config.isConfirm ? false : undefined);
+      });
+
+      // Keyboard
+      function keyHandler(e) {
+        if (e.key === 'Enter') {
+          e.preventDefault();
+          cleanup(config.isConfirm ? true : undefined);
+        }
+        if (e.key === 'Escape') {
+          e.preventDefault();
+          cleanup(config.isConfirm ? false : undefined);
+        }
+      }
+      document.addEventListener('keydown', keyHandler);
+
+      document.body.appendChild(overlay);
+      // Nächster Frame für CSS-Transition
+      requestAnimationFrame(() => {
+        overlay.classList.add('active');
+        confirmBtn.focus();
+      });
+    });
+  },
+
+  /**
+   * Zeigt einen Alert-Dialog (ersetzt window.alert)
+   * @param {string} message - Nachricht
+   * @param {Object} [options] - { title, confirmText, type }
+   * @returns {Promise<void>}
+   */
+  alert(message, options) {
+    const opts = options || {};
+    return this._show({
+      message,
+      title: opts.title || 'Hinweis',
+      confirmText: opts.confirmText || 'OK',
+      cancelText: '',
+      type: opts.type || 'info',
+      isConfirm: false
+    });
+  },
+
+  /**
+   * Zeigt einen Confirm-Dialog (ersetzt window.confirm)
+   * @param {string} message - Nachricht
+   * @param {Object} [options] - { title, confirmText, cancelText, type }
+   * @returns {Promise<boolean>}
+   */
+  confirm(message, options) {
+    const opts = options || {};
+    return this._show({
+      message,
+      title: opts.title || 'Bestätigung',
+      confirmText: opts.confirmText || 'OK',
+      cancelText: opts.cancelText || 'Abbrechen',
+      type: opts.type || 'info',
+      isConfirm: true
+    });
+  }
+};

src/js/drag.js

@@ -37,13 +37,11 @@ function initBoardDragDrop() {
 
       // Ghost
       const ghost = boardEl.cloneNode(true);
-      ghost.style.cssText = `
-        position:fixed; left:${rect.left}px; top:${rect.top}px;
-        width:${rect.width}px; height:${rect.height}px;
-        opacity:0.75; pointer-events:none; z-index:9999;
-        transform:rotate(1.5deg) scale(1.02);
-        box-shadow:0 12px 40px rgba(0,0,0,0.6);
-      `;
+      ghost.className += ' drag-ghost';
+      ghost.style.left = rect.left + 'px';
+      ghost.style.top = rect.top + 'px';
+      ghost.style.width = rect.width + 'px';
+      ghost.style.height = rect.height + 'px';
       document.body.appendChild(ghost);
 
       // Placeholder
@@ -104,29 +102,42 @@ function initBoardDragDrop() {
 function initBookmarkDragDrop(listEl, board) {
   let dragSrcBmId = null;
 
-  listEl.querySelectorAll('.bm-item').forEach(item => {
-    item.addEventListener('dragstart', e => {
-      dragSrcBmId = item.dataset.bmId;
-      e.dataTransfer.effectAllowed = 'move';
-      setTimeout(() => item.style.opacity = '0.4', 0);
-    });
-    item.addEventListener('dragend',  () => { item.style.opacity = ''; });
-    item.addEventListener('dragover', e => {
-      e.preventDefault();
-      item.style.background = 'rgba(255,160,50,0.07)';
-    });
-    item.addEventListener('dragleave', () => { item.style.background = ''; });
-    item.addEventListener('drop', async e => {
-      e.preventDefault(); e.stopPropagation();
-      item.style.background = '';
-      const targetBmId = item.dataset.bmId;
-      if (!dragSrcBmId || dragSrcBmId === targetBmId) return;
-      const srcIdx = board.bookmarks.findIndex(b => b.id === dragSrcBmId);
-      const tgtIdx = board.bookmarks.findIndex(b => b.id === targetBmId);
-      const [moved] = board.bookmarks.splice(srcIdx, 1);
-      board.bookmarks.splice(tgtIdx, 0, moved);
-      await saveBoards();
-      renderBoards();
-    });
+  listEl.addEventListener('dragstart', e => {
+    const item = e.target.closest('.bm-item');
+    if (!item) return;
+    dragSrcBmId = item.dataset.bmId;
+    e.dataTransfer.effectAllowed = 'move';
+    setTimeout(() => item.classList.add('dragging-source'), 0);
+  });
+
+  listEl.addEventListener('dragend', e => {
+    const item = e.target.closest('.bm-item');
+    if (item) item.classList.remove('dragging-source');
+  });
+
+  listEl.addEventListener('dragover', e => {
+    e.preventDefault();
+    const item = e.target.closest('.bm-item');
+    if (item) item.classList.add('drag-over');
+  });
+
+  listEl.addEventListener('dragleave', e => {
+    const item = e.target.closest('.bm-item');
+    if (item) item.classList.remove('drag-over');
+  });
+
+  listEl.addEventListener('drop', async e => {
+    e.preventDefault(); e.stopPropagation();
+    const item = e.target.closest('.bm-item');
+    if (!item) return;
+    item.classList.remove('drag-over');
+    const targetBmId = item.dataset.bmId;
+    if (!dragSrcBmId || dragSrcBmId === targetBmId) return;
+    const srcIdx = board.bookmarks.findIndex(b => b.id === dragSrcBmId);
+    const tgtIdx = board.bookmarks.findIndex(b => b.id === targetBmId);
+    const [moved] = board.bookmarks.splice(srcIdx, 1);
+    board.bookmarks.splice(tgtIdx, 0, moved);
+    await saveBoards();
+    renderBoards();
   });
 }

src/js/onboarding.js

@@ -0,0 +1,207 @@
+/* =============================================
+   HELLION NEWTAB — onboarding.js
+   Mehrstufiger Willkommens-Flow beim ersten Start
+   ============================================= */
+
+const Onboarding = {
+  currentSlide: 0,
+
+  slides: [
+    {
+      hero: '\u2B21',
+      title: 'Willkommen bei Hellion Dashboard',
+      text: 'Dein neuer Browser-Startbildschirm. Minimalistisch, schnell und vollst\u00E4ndig lokal \u2014 keine Cloud, kein Account, keine Datensammlung.'
+    },
+    {
+      hero: '\uD83D\uDCCB',
+      title: 'Boards & Bookmarks',
+      features: [
+        'Erstelle Boards mit dem \u201E+ Board\u201C Button oben',
+        'Importiere Browser-Lesezeichen \u00FCber den \u201EImport\u201C Button im Header',
+        'Drag & Drop zum Umsortieren von Boards und Links',
+        'Blur-Modus f\u00FCr private Boards (\uD83D\uDD12 Icon)'
+      ]
+    },
+    {
+      hero: '\uD83C\uDFA8',
+      title: '8 handgefertigte Themes',
+      text: 'Klicke auf den „Theme" Button im Header um dein Theme zu wählen. Jedes hat seinen eigenen Stil und Farbpalette.',
+      showThemes: true
+    },
+    {
+      hero: '\u26A1',
+      title: 'Weitere Features',
+      features: [
+        'Suchleiste mit Google, DuckDuckGo oder Bing',
+        'Sticky Notes f\u00FCr schnelle Notizen',
+        'Funktioniert komplett offline \u2014 alles lokal gespeichert'
+      ]
+    },
+    {
+      hero: '\uD83D\uDEE1\uFE0F',
+      title: 'Backups nicht vergessen!',
+      text: 'Deine Daten sind lokal im Browser gespeichert. Wenn du Browserdaten l\u00F6schst, gehen sie verloren! Sichere regelm\u00E4\u00DFig \u00FCber Settings \u2192 Data \u2192 Export. Wir erinnern dich alle 7 Tage daran.'
+    },
+    {
+      hero: '\uD83D\uDE80',
+      title: 'Bereit!',
+      text: 'Klicke auf \u201E+ Board\u201C um dein erstes Board zu erstellen, oder nutze den \u201EImport\u201C Button im Header um deine Browser-Lesezeichen zu importieren.'
+    }
+  ],
+
+  /** Startet das Onboarding */
+  start() {
+    this.currentSlide = 0;
+    this._render();
+    this._bindKeyboard();
+    const overlay = document.getElementById('onboardingOverlay');
+    requestAnimationFrame(() => overlay.classList.add('active'));
+  },
+
+  /** Schlie\u00DFt das Onboarding und speichert den Status */
+  async _finish() {
+    const overlay = document.getElementById('onboardingOverlay');
+    overlay.classList.remove('active');
+    document.removeEventListener('keydown', this._keyHandler);
+    await Store.set('onboardingDone', true);
+  },
+
+  /** Rendert den aktuellen Slide */
+  _render() {
+    const modal = document.getElementById('onboardingModal');
+    modal.replaceChildren();
+
+    const slide = this.slides[this.currentSlide];
+    const isLast = this.currentSlide === this.slides.length - 1;
+
+    // Skip-Button (nicht auf letztem Slide)
+    if (!isLast) {
+      const skip = document.createElement('button');
+      skip.className = 'onboarding-skip';
+      skip.textContent = '\u00DCberspringen';
+      skip.addEventListener('click', () => this._finish());
+      modal.appendChild(skip);
+    }
+
+    // Slide-Content
+    const slideEl = document.createElement('div');
+    slideEl.className = 'onboarding-slide';
+
+    const hero = document.createElement('div');
+    hero.className = 'onboarding-hero';
+    hero.textContent = slide.hero;
+    slideEl.appendChild(hero);
+
+    const title = document.createElement('div');
+    title.className = 'onboarding-title';
+    title.textContent = slide.title;
+    slideEl.appendChild(title);
+
+    if (slide.text) {
+      const text = document.createElement('div');
+      text.className = 'onboarding-text';
+      text.textContent = slide.text;
+      slideEl.appendChild(text);
+    }
+
+    if (slide.features) {
+      const list = document.createElement('ul');
+      list.className = 'onboarding-feature-list';
+      slide.features.forEach(f => {
+        const li = document.createElement('li');
+        li.textContent = f;
+        list.appendChild(li);
+      });
+      slideEl.appendChild(list);
+    }
+
+    if (slide.showThemes) {
+      const grid = document.createElement('div');
+      grid.className = 'onboarding-theme-grid';
+      const themeNames = ['Nebula', 'Crescent', 'Event Horizon', 'Merchantman', 'Julia & Jin', 'SC Sunset', 'Hellion HUD', 'Hellion Energy'];
+      themeNames.forEach(name => {
+        const chip = document.createElement('div');
+        chip.className = 'onboarding-theme-chip';
+        chip.textContent = name;
+        grid.appendChild(chip);
+      });
+      slideEl.appendChild(grid);
+    }
+
+    modal.appendChild(slideEl);
+
+    // Footer
+    const footer = document.createElement('div');
+    footer.className = 'onboarding-footer';
+
+    // Dots
+    const dots = document.createElement('div');
+    dots.className = 'onboarding-dots';
+    for (let i = 0; i < this.slides.length; i++) {
+      const dot = document.createElement('div');
+      dot.className = 'onboarding-dot' + (i === this.currentSlide ? ' active' : '');
+      dots.appendChild(dot);
+    }
+    footer.appendChild(dots);
+
+    // Navigation
+    const nav = document.createElement('div');
+    nav.className = 'onboarding-nav';
+
+    if (this.currentSlide > 0) {
+      const backBtn = document.createElement('button');
+      backBtn.className = 'btn-secondary';
+      backBtn.textContent = 'Zur\u00FCck';
+      backBtn.addEventListener('click', () => {
+        this.currentSlide--;
+        this._render();
+      });
+      nav.appendChild(backBtn);
+    }
+
+    if (isLast) {
+      const startBtn = document.createElement('button');
+      startBtn.className = 'btn-primary';
+      startBtn.textContent = 'Los geht\u2019s!';
+      startBtn.addEventListener('click', () => this._finish());
+      nav.appendChild(startBtn);
+    } else {
+      const nextBtn = document.createElement('button');
+      nextBtn.className = 'btn-primary';
+      nextBtn.textContent = 'Weiter';
+      nextBtn.addEventListener('click', () => {
+        this.currentSlide++;
+        this._render();
+      });
+      nav.appendChild(nextBtn);
+    }
+
+    footer.appendChild(nav);
+    modal.appendChild(footer);
+  },
+
+  /** Keyboard-Navigation */
+  _bindKeyboard() {
+    this._keyHandler = (e) => {
+      if (e.key === 'ArrowRight' || e.key === 'Enter') {
+        e.preventDefault();
+        if (this.currentSlide < this.slides.length - 1) {
+          this.currentSlide++;
+          this._render();
+        } else {
+          this._finish();
+        }
+      }
+      if (e.key === 'ArrowLeft' && this.currentSlide > 0) {
+        e.preventDefault();
+        this.currentSlide--;
+        this._render();
+      }
+      if (e.key === 'Escape') {
+        e.preventDefault();
+        this._finish();
+      }
+    };
+    document.addEventListener('keydown', this._keyHandler);
+  }
+};

src/js/storage.js

@@ -23,7 +23,7 @@ const Store = {
         chrome.storage.local.set({ [key]: value }, () => {
           if (chrome.runtime.lastError) {
             console.error('Storage-Fehler:', chrome.runtime.lastError.message);
-            alert('Speicher voll! Bitte lösche alte Boards oder das Hintergrundbild, um Platz zu schaffen.');
+            HellionDialog.alert('Speicher voll! Bitte lösche alte Boards oder das Hintergrundbild, um Platz zu schaffen.', { type: 'danger', title: 'Speicher voll' });
             reject(new Error(chrome.runtime.lastError.message));
             return;
           }
@@ -35,7 +35,7 @@ const Store = {
           resolve();
         } catch (e) {
           console.error('Storage-Fehler:', e.message);
-          alert('Speicher voll! Bitte lösche alte Boards oder das Hintergrundbild, um Platz zu schaffen.');
+          HellionDialog.alert('Speicher voll! Bitte lösche alte Boards oder das Hintergrundbild, um Platz zu schaffen.', { type: 'danger', title: 'Speicher voll' });
           reject(e);
         }
       }