Calendar fully blocked for unauthenticated users

- Overlay blocks entire calendar with 'login to view dates' message
- Date cells disabled when not authenticated
- Clicking overlay or any disabled date shows login/register dialog

app/property/[id]/page.js

@@ -609,7 +609,18 @@ export default function PropertyDetailsPage() {
                 })()}
 
                 {/* Calendar */}
-                <div className="mb-4">
+                <div className="mb-4 relative">
+                  {!AuthService.isAuthenticated() && (
+                    <div
+                      onClick={() => setShowLoginDialog(true)}
+                      className="absolute inset-0 z-10 flex items-center justify-center bg-white/80 backdrop-blur-sm rounded-xl cursor-pointer"
+                    >
+                      <div className="text-center">
+                        <LogIn className="w-8 h-8 text-gray-400 mx-auto mb-2" />
+                        <p className="text-sm text-gray-500 font-medium">سجّل الدخول لعرض التواريخ المتاحة</p>
+                      </div>
+                    </div>
+                  )}
                   <div className="flex items-center justify-between mb-3">
                     <button onClick={() => setCalendarMonth(new Date(calendarMonth.getFullYear(), calendarMonth.getMonth() - 1))} className="p-1 hover:bg-gray-100 rounded-lg">
                       <ChevronRight className="w-5 h-5" />
@@ -651,8 +662,8 @@ export default function PropertyDetailsPage() {
                         cells.push(
                           <button
                             key={dateStr}
-                            onClick={() => !isPast && handleCalendarClick(dateStr)}
-                            disabled={isPast || !available}
+                            onClick={() => !isPast && AuthService.isAuthenticated() && handleCalendarClick(dateStr)}
+                            disabled={isPast || !available || !AuthService.isAuthenticated()}
                             className={`w-full aspect-square rounded-lg text-sm font-medium transition-all ${
                               isStart || isEnd
                                 ? 'bg-amber-500 text-white'