fix(mobile): Monatstitel sichtbar, KW-Bubble unten, Termine mit Text, Long-Press, Settings-Hamburger

- View-Switcher auf Mobile in Popup-Menü ausgelagert (neuer Icon-Button
  rechts in der Topbar). Dadurch wird in der Topbar Platz frei für
  prev/next + Monatstitel ("Mai 2026" usw.).
- Topbar-Settings-Icon auf Mobile ausgeblendet, dafür neuer
  "Einstellungen"-Eintrag im User-Dropdown. "Heute" wandert ins
  View-Popup.
- KW-Bubble: von oben-links nach unten-links verschoben — überlappt
  jetzt nicht mehr die Tagesnummer.
- Termine in der Monatsansicht zeigen wieder ihren Text (kleinere
  14px-Höhe, 9px Schrift) statt nur farbiger Punkte.
- Long-Press auf einen Tag öffnet das Kontextmenü "Termin erstellen"
  (synthetisches contextmenu-Event nach 500 ms ohne Bewegung). Der
  nachfolgende synthetische Click wird unterdrückt.
- Settings-Modal: Sidebar (Darstellung/Konten/Benutzerverwaltung) auf
  Mobile als slide-in Overlay mit Hamburger-Toggle. Auf Desktop bleibt
  sie immer sichtbar.
- Version v4 → v5 (auch SW-Cache)

frontend/css/app.css

@@ -1218,6 +1218,12 @@ a { color: var(--primary); text-decoration: none; }
 /* Backdrop element exists in DOM but is hidden by default on desktop */
 .sidebar-backdrop { display: none; }
 
+/* Mobile-only UI elements: hidden on desktop ───────────── */
+.view-mobile-wrapper { position: relative; display: none; }
+.settings-nav-toggle { display: none; }
+.settings-nav-backdrop { display: none; }
+.dropdown-item-mobile-only { display: none; }
+
 @media (max-width: 768px) {
   html, body { overflow-x: hidden; max-width: 100vw; }
 
@@ -1291,16 +1297,14 @@ a { color: var(--primary); text-decoration: none; }
   .btn { min-height: 44px; }
   .view-switcher .view-btn { min-height: 40px; }
 
-  /* ── Month view: dots instead of full event titles ───────── */
+  /* ── Month view: events keep text, just smaller ──────────── */
   .month-span-event {
-    height: 6px !important;
-    line-height: 0 !important;
-    padding: 0 !important;
-    border-radius: 3px !important;
-    font-size: 0 !important;
-    text-overflow: clip !important;
+    height: 14px !important;
+    line-height: 14px !important;
+    padding: 0 4px !important;
+    font-size: 9px !important;
+    font-weight: 500;
   }
-  .month-events-overlay { gap: 1px; }
   .month-more {
     font-size: 9px;
     padding: 0 2px;
@@ -1381,18 +1385,20 @@ a { color: var(--primary); text-decoration: none; }
   }
   .month-kw-cell {
     position: absolute;
-    left: 3px; top: 3px;
+    /* Bottom-left: away from the day-number (top-left) */
+    left: 3px; bottom: 3px;
+    top: auto; right: auto;
     width: auto; height: auto;
-    bottom: auto;
-    padding: 1px 7px;
+    padding: 1px 6px;
     background: var(--bg-active);
     border: none !important;
     border-radius: 10px;
-    font-size: 10px; font-weight: 600;
+    font-size: 9px; font-weight: 600;
     color: var(--text-2);
     z-index: 5;
     display: inline-flex;
     align-items: center;
+    pointer-events: none;
   }
 
   /* ── Status-bar safe area inside full-screen modals (PWA) ── */
@@ -1404,6 +1410,64 @@ a { color: var(--primary); text-decoration: none; }
   .settings-page-body {
     padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
   }
+
+  /* ── Topbar: hide desktop view-switcher + settings, show
+     mobile view-toggle and let the title breathe ──────────── */
+  .topbar .view-switcher { display: none; }
+  .topbar #btn-settings { display: none; }
+  .view-mobile-wrapper { display: inline-block; }
+  .dropdown-item-mobile-only { display: flex; }
+
+  /* Hide "Heute" button on desktop topbar (it's in the view popup now) */
+  .topbar #btn-today { display: none; }
+
+  /* The title is the most important info — let it grow */
+  .topbar-center { flex: 1; min-width: 0; }
+  .topbar-center .view-title {
+    font-size: 17px;
+    font-weight: 500;
+    padding-left: 4px;
+    flex: 1;
+  }
+  .topbar-left { gap: 0; }
+  .topbar-right { gap: 0; }
+
+  /* ── Settings modal: nav becomes a slide-in overlay ──────── */
+  .settings-nav-toggle { display: inline-flex !important; }
+  .settings-page-body { position: relative; }
+  .settings-nav {
+    position: absolute;
+    top: 0; left: 0; bottom: 0;
+    width: min(75vw, 280px);
+    z-index: 50;
+    background: var(--bg-app);
+    border-right: 1px solid var(--border);
+    transform: translateX(-100%);
+    transition: transform .25s ease;
+    box-shadow: var(--shadow-lg);
+  }
+  .settings-page-card.nav-open .settings-nav {
+    transform: translateX(0);
+  }
+  .settings-nav-backdrop {
+    display: block;
+    position: absolute; inset: 0;
+    background: rgba(0,0,0,.5);
+    z-index: 40;
+    opacity: 0;
+    pointer-events: none;
+    transition: opacity .2s ease;
+  }
+  .settings-page-card.nav-open .settings-nav-backdrop {
+    opacity: 1;
+    pointer-events: auto;
+  }
+  .settings-panels { padding: 16px; }
+
+  /* Modal headers: tighter on mobile */
+  .modal-header { padding: 12px 16px; }
+  .modal-body { padding: 16px; }
+  .modal-footer { padding: 12px 16px; }
 }
 
 /* iOS notch / home-indicator safe areas (PWA standalone) */