feat: Mobile Bottom-Navigation mit Swipe und Dot-Indikator

- Alle 9 Menüpunkte jetzt auf Mobile erreichbar (2 Seiten)
- Horizontaler Scroll-Snap für seitenweises Swipen
- Dezente Dot-Indikatoren zeigen aktive Seite an
- Automatischer Scroll zur richtigen Seite bei Navigation zu Seite-2-Items
- Service Worker Cache v12

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/router.js

@@ -156,9 +156,18 @@ function renderAppShell(container) {
     </main>
 
     <nav class="nav-bottom" aria-label="Navigation">
-      <div class="nav-bottom__items" role="list">
+      <div class="nav-bottom__dots" aria-hidden="true">
+        <span class="nav-bottom__dot nav-bottom__dot--active"></span>
+        <span class="nav-bottom__dot"></span>
+      </div>
+      <div class="nav-bottom__scroll">
+        <div class="nav-bottom__page" role="list">
           ${navItems().slice(0, 5).map(navItemHtml).join('')}
         </div>
+        <div class="nav-bottom__page" role="list">
+          ${navItems().slice(5).map(navItemHtml).join('')}
+        </div>
+      </div>
     </nav>
 
     <div class="toast-container" id="toast-container" aria-live="assertive"></div>
@@ -171,6 +180,36 @@ function renderAppShell(container) {
       navigate(el.dataset.route);
     });
   });
+
+  // Bottom-Nav: Scroll-Snap + Dot-Indikator
+  initBottomNavSwipe(container);
+}
+
+/**
+ * Initialisiert Swipe-Gesten und Dot-Indikator für die mobile Bottom-Navigation.
+ */
+function initBottomNavSwipe(container) {
+  const scroll = container.querySelector('.nav-bottom__scroll');
+  const dots   = container.querySelectorAll('.nav-bottom__dot');
+  if (!scroll || !dots.length) return;
+
+  // Scroll-Event: Dot-Indikator aktualisieren
+  scroll.addEventListener('scroll', () => {
+    const page = Math.round(scroll.scrollLeft / scroll.offsetWidth);
+    dots.forEach((d, i) => d.classList.toggle('nav-bottom__dot--active', i === page));
+  }, { passive: true });
+}
+
+/**
+ * Scrollt die Bottom-Nav zur richtigen Seite, wenn ein Item auf Seite 2 aktiv ist.
+ */
+function scrollNavToActive() {
+  const scroll = document.querySelector('.nav-bottom__scroll');
+  if (!scroll) return;
+  const secondPage = navItems().slice(5).map(n => n.path);
+  if (secondPage.includes(currentPath)) {
+    scroll.scrollTo({ left: scroll.offsetWidth, behavior: 'smooth' });
+  }
 }
 
 function navItems() {
@@ -211,6 +250,9 @@ function updateNav(path) {
   if (window.lucide) {
     window.lucide.createIcons();
   }
+
+  // Bottom-Nav zur aktiven Seite scrollen
+  scrollNavToActive();
 }
 
 function renderError(container, err) {

public/styles/layout.css

@@ -66,7 +66,7 @@
  * -------------------------------------------------------- */
 .app-content {
   flex: 1;
-  padding-bottom: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom));
+  padding-bottom: calc(var(--nav-height-mobile) + 12px + var(--safe-area-inset-bottom));
   overflow-y: auto;
 }
 
@@ -86,21 +86,58 @@
   bottom: 0;
   left: 0;
   right: 0;
-  height: calc(var(--nav-height-mobile) + var(--safe-area-inset-bottom));
-  padding-bottom: var(--safe-area-inset-bottom);
   background-color: color-mix(in srgb, var(--color-surface) 85%, transparent);
   border-top: 1px solid var(--color-border-subtle);
   display: flex;
-  align-items: center;
+  flex-direction: column;
   z-index: var(--z-nav);
   backdrop-filter: blur(16px) saturate(180%);
   -webkit-backdrop-filter: blur(16px) saturate(180%);
+  padding-bottom: var(--safe-area-inset-bottom);
 }
 
-.nav-bottom__items {
+/* ── Dot-Indikator ── */
+.nav-bottom__dots {
   display: flex;
-  width: 100%;
+  justify-content: center;
-  height: 100%;
+  gap: 6px;
+  padding: 5px 0 2px;
+}
+
+.nav-bottom__dot {
+  width: 5px;
+  height: 5px;
+  border-radius: 50%;
+  background-color: var(--color-text-tertiary);
+  opacity: 0.25;
+  transition: opacity 0.2s ease, transform 0.2s ease;
+}
+
+.nav-bottom__dot--active {
+  opacity: 0.7;
+  transform: scale(1.2);
+}
+
+/* ── Scroll-Container ── */
+.nav-bottom__scroll {
+  display: flex;
+  overflow-x: auto;
+  scroll-snap-type: x mandatory;
+  -webkit-overflow-scrolling: touch;
+  scrollbar-width: none;              /* Firefox */
+  height: var(--nav-height-mobile);
+}
+
+.nav-bottom__scroll::-webkit-scrollbar {
+  display: none;                       /* Chrome/Safari */
+}
+
+/* ── Einzelne Seiten ── */
+.nav-bottom__page {
+  display: flex;
+  min-width: 100%;
+  flex-shrink: 0;
+  scroll-snap-align: start;
 }
 
 /* ── Nav-Item (Bottom-Bar): Basis-State ── */

public/sw.js

@@ -12,9 +12,9 @@
  *   API: Immer Netzwerk (kein Caching von Nutzerdaten)
  */
 
-const SHELL_CACHE   = 'oikos-shell-v11';
+const SHELL_CACHE   = 'oikos-shell-v12';
-const PAGES_CACHE   = 'oikos-pages-v11';
+const PAGES_CACHE   = 'oikos-pages-v12';
-const ASSETS_CACHE  = 'oikos-assets-v11';
+const ASSETS_CACHE  = 'oikos-assets-v12';
 const ALL_CACHES    = [SHELL_CACHE, PAGES_CACHE, ASSETS_CACHE];
 
 // App-Shell: sofort benötigt für ersten Render