Fix: clear mini-cal selection on Today click even when month unchanged

datesSet fires but currentDate stays the same value when already on
the current month, so the useEffect didn't re-run. Added navKey counter
that increments on every datesSet call — MiniCalendar watches it in a
separate useEffect to reliably clear selectedDate.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/calendar/CalendarPage.tsx

@@ -54,6 +54,7 @@ export default function CalendarPage() {
   const firstDayOfWeek = settings?.first_day_of_week ?? 0;
   const { data: calendars = [], sharedData, allCalendarIds } = useCalendars({ pollingEnabled: true });
   const [currentDate, setCurrentDate] = useState<string>(() => format(new Date(), 'yyyy-MM-dd'));
+  const [navKey, setNavKey] = useState(0);
   const [visibleSharedIds, setVisibleSharedIds] = useState<Set<number>>(new Set());
   const calendarContainerRef = useRef<HTMLDivElement>(null);
 
@@ -521,6 +522,8 @@ export default function CalendarPage() {
     );
     // Track current date anchor for mini calendar sync
     setCurrentDate(format(arg.view.currentStart, 'yyyy-MM-dd'));
+    // Increment nav key so mini calendar clears selection even when month doesn't change
+    setNavKey((k) => k + 1);
   };
 
   const navigatePrev = () => calendarRef.current?.getApi().prev();
@@ -599,7 +602,7 @@ export default function CalendarPage() {
   return (
     <div className="flex h-full overflow-hidden animate-fade-in">
       <div className="hidden lg:flex lg:flex-row shrink-0">
-        <CalendarSidebar ref={sidebarRef} onUseTemplate={handleUseTemplate} onSharedVisibilityChange={setVisibleSharedIds} width={sidebarWidth} onDateClick={handleMiniCalClick} currentDate={currentDate} firstDayOfWeek={firstDayOfWeek} />
+        <CalendarSidebar ref={sidebarRef} onUseTemplate={handleUseTemplate} onSharedVisibilityChange={setVisibleSharedIds} width={sidebarWidth} onDateClick={handleMiniCalClick} currentDate={currentDate} firstDayOfWeek={firstDayOfWeek} navKey={navKey} />
         <div
           onMouseDown={handleSidebarMouseDown}
           className="w-1 shrink-0 cursor-col-resize hover:bg-accent/30 active:bg-accent/50 transition-colors duration-150"
@@ -610,7 +613,7 @@ export default function CalendarPage() {
         <Sheet open={mobileSidebarOpen} onOpenChange={setMobileSidebarOpen}>
           <SheetContent className="w-72 p-0">
             <SheetClose onClick={() => setMobileSidebarOpen(false)} />
-            <CalendarSidebar onUseTemplate={(tmpl) => { setMobileSidebarOpen(false); handleUseTemplate(tmpl); }} onSharedVisibilityChange={setVisibleSharedIds} width={288} onDateClick={handleMiniCalClick} currentDate={currentDate} firstDayOfWeek={firstDayOfWeek} />
+            <CalendarSidebar onUseTemplate={(tmpl) => { setMobileSidebarOpen(false); handleUseTemplate(tmpl); }} onSharedVisibilityChange={setVisibleSharedIds} width={288} onDateClick={handleMiniCalClick} currentDate={currentDate} firstDayOfWeek={firstDayOfWeek} navKey={navKey} />
           </SheetContent>
         </Sheet>
       )}

frontend/src/components/calendar/CalendarSidebar.tsx

@@ -19,9 +19,10 @@ interface CalendarSidebarProps {
   onDateClick?: (dateStr: string) => void;
   currentDate?: string;
   firstDayOfWeek?: number;
+  navKey?: number;
 }
 
-const CalendarSidebar = forwardRef<HTMLDivElement, CalendarSidebarProps>(function CalendarSidebar({ onUseTemplate, onSharedVisibilityChange, width, onDateClick, currentDate, firstDayOfWeek }, ref) {
+const CalendarSidebar = forwardRef<HTMLDivElement, CalendarSidebarProps>(function CalendarSidebar({ onUseTemplate, onSharedVisibilityChange, width, onDateClick, currentDate, firstDayOfWeek, navKey }, ref) {
   const queryClient = useQueryClient();
   const { data: calendars = [], sharedData: sharedCalendars = [] } = useCalendars();
   const [showForm, setShowForm] = useState(false);
@@ -108,6 +109,7 @@ const CalendarSidebar = forwardRef<HTMLDivElement, CalendarSidebarProps>(functio
             onDateClick={onDateClick}
             currentDate={currentDate}
             firstDayOfWeek={firstDayOfWeek}
+            navKey={navKey}
           />
         </div>
       )}

frontend/src/components/calendar/MiniCalendar.tsx

@@ -11,6 +11,7 @@ interface MiniCalendarProps {
   onDateClick: (dateStr: string) => void;
   currentDate?: string;
   firstDayOfWeek?: number;
+  navKey?: number;
 }
 
 const DAY_LABELS = ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'];
@@ -31,6 +32,7 @@ const MiniCalendar = memo(function MiniCalendar({
   onDateClick,
   currentDate,
   firstDayOfWeek = 0,
+  navKey,
 }: MiniCalendarProps) {
   const REF_DATE = useMemo(() => new Date(), []);
 
@@ -44,17 +46,21 @@ const MiniCalendar = memo(function MiniCalendar({
   );
   const [selectedDate, setSelectedDate] = useState<string | null>(null);
 
-  // Sync displayed month when main calendar navigates (toolbar prev/next/today)
-  // Also clear selected date — avoids stale highlight after "Today" click
+  // Sync displayed month when main calendar navigates across months
   useEffect(() => {
     if (!currentDate) return;
     const incoming = startOfMonth(parseDate(currentDate));
     setDisplayedMonth((prev) =>
       prev.getTime() === incoming.getTime() ? prev : incoming
     );
-    setSelectedDate(null);
   }, [currentDate, parseDate]);
 
+  // Clear selection on any toolbar navigation (today/prev/next)
+  // navKey increments on every datesSet, even when the month doesn't change
+  useEffect(() => {
+    setSelectedDate(null);
+  }, [navKey]);
+
   const days = useMemo(
     () => buildGrid(displayedMonth, firstDayOfWeek),
     [displayedMonth, firstDayOfWeek]