feat: add setting to show event start time in month view

stores/settings-store.ts

@@ -106,6 +106,9 @@ interface SettingsState {
   sessionTimeout: number; // minutes (0 = never)
   trustedSenders: string[]; // Email addresses that can load external content
 
+  // Calendar
+  showTimeInMonthView: boolean;
+
   // Calendar Notifications
   calendarNotificationsEnabled: boolean;
   calendarNotificationSound: boolean;
@@ -201,6 +204,9 @@ const DEFAULT_SETTINGS = {
   sessionTimeout: 0, // Never
   trustedSenders: [] as string[],
 
+  // Calendar
+  showTimeInMonthView: false,
+
   // Calendar Notifications
   calendarNotificationsEnabled: true,
   calendarNotificationSound: true,
@@ -281,6 +287,7 @@ export const useSettingsStore = create<SettingsState>()(
           sendConfirmation: state.sendConfirmation,
           defaultReplyMode: state.defaultReplyMode,
           sessionTimeout: state.sessionTimeout,
+          showTimeInMonthView: state.showTimeInMonthView,
           calendarNotificationsEnabled: state.calendarNotificationsEnabled,
           calendarNotificationSound: state.calendarNotificationSound,
           calendarInvitationParsingEnabled: state.calendarInvitationParsingEnabled,