Web: expose month-navigation mode as a named dropdown

New 'Monatswechsel' setting (synced flag already existed as month_view_paged):
- Continuous scroll (week): current behaviour — wheel scrolls by a week,
  buttons/swipe jump 4 weeks.
- Page by page (month): wheel navigation is disabled; buttons and horizontal
  swipe jump a whole calendar month.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/js/calendar.js

@@ -1209,9 +1209,14 @@ function bindSwipeNavigation() {
 function navigate(dir) {
   const d = state.currentDate;
   if (state.currentView === 'month') {
-    // Buttons jump 4 weeks (one screenful)
+    if (state.settings && state.settings.month_view_paged) {
+      // Paged mode: jump a whole calendar month.
+      state.currentDate = new Date(d.getFullYear(), d.getMonth() + dir, Math.min(d.getDate(), 28));
+    } else {
+      // Scroll mode: buttons jump 4 weeks (one screenful of the rolling grid).
       state.currentDate = new Date(d);
       state.currentDate.setDate(d.getDate() + dir * 28);
+    }
   } else if (state.currentView === 'week') {
     state.currentDate = new Date(d);
     state.currentDate.setDate(d.getDate() + dir * 7);
@@ -1335,6 +1340,8 @@ function bindTopbar() {
     _wheelLast = now;
     const dir = e.deltaY > 0 ? 1 : -1;
     if (state.currentView === 'month') {
+      // Paged mode: no scroll navigation — only buttons / horizontal swipe.
+      if (state.settings && state.settings.month_view_paged) return;
       state.currentDate = new Date(state.currentDate);
       state.currentDate.setDate(state.currentDate.getDate() + dir * 7);
       fetchAndRender();
@@ -3463,11 +3470,13 @@ function wireSettingRow(def) {
 function readAppearanceTable() {
   const out = {};
   const numKeys = new Set(['hour_height', 'default_event_duration_minutes']);
+  const boolKeys = new Set(['month_view_paged']);
   SETTING_GROUPS.forEach(g => g.rows.forEach(def => {
     if (def.type === 'select') {
       const el = document.querySelector(`[data-skey="${def.key}"]`);
       let v = el ? el.value : state.settings[def.key];
       if (numKeys.has(def.key)) v = Number(v);
+      else if (boolKeys.has(def.key)) v = (String(v) === 'true');
       out[def.key] = v;
     } else if (def.type === 'toggle') {
       const el = document.querySelector(`[data-vtoggle="${def.key}"]`);

frontend/js/i18n.js

@@ -92,6 +92,9 @@ const translations = {
     settings_week_start: 'Erster Wochentag',
     week_start_monday: 'Montag', week_start_sunday: 'Sonntag',
     settings_dim_past: 'Vergangene Termine ausgrauen',
+    settings_month_mode: 'Monatswechsel',
+    settings_month_mode_scroll: 'Fortlaufend scrollen (Woche)',
+    settings_month_mode_paged: 'Seitenweise blättern (Monat)',
     settings_default_duration: 'Standard-Termindauer',
     settings_privacy: 'Privatsphäre',
     settings_private_visibility: 'Private Termine für Gruppenmitglieder',
@@ -446,6 +449,9 @@ const translations = {
     settings_week_start: 'First day of week',
     week_start_monday: 'Monday', week_start_sunday: 'Sunday',
     settings_dim_past: 'Dim past events',
+    settings_month_mode: 'Month switching',
+    settings_month_mode_scroll: 'Continuous scroll (week)',
+    settings_month_mode_paged: 'Page by page (month)',
     settings_default_duration: 'Default event duration',
     settings_privacy: 'Privacy',
     settings_private_visibility: 'Private events for group members',

frontend/js/settings-sync.js

@@ -34,6 +34,9 @@ export const SETTING_GROUPS = [
         { v: 'monday', tk: 'week_start_monday' }, { v: 'sunday', tk: 'week_start_sunday' },
       ] },
       { key: 'dim_past_events', labelKey: 'settings_dim_past', type: 'toggle' },
+      { key: 'month_view_paged', labelKey: 'settings_month_mode', type: 'select', opts: [
+        { v: false, tk: 'settings_month_mode_scroll' }, { v: true, tk: 'settings_month_mode_paged' },
+      ] },
       { key: 'hour_height', labelKey: 'settings_hour_height', type: 'select', opts: [
         { v: 28, tk: 'hour_compact' }, { v: 44, tk: 'hour_normal' },
         { v: 60, tk: 'hour_comfort' }, { v: 80, tk: 'hour_large' },

frontend/sw.js

@@ -7,7 +7,7 @@
 // the entry HTML / version files). New releases take effect on the next
 // reload, no manual SW unregister required.
 
-const CACHE_VERSION  = 'calendarr-v29';
+const CACHE_VERSION  = 'calendarr-v30';
 const OFFLINE_SHELL  = ['/', '/index.html'];
 
 self.addEventListener('install', event => {