Fix mobile responsiveness across all pages

- BookingsPage: hide Номер/Выезд/Источник columns on small screens, show nights inline on mobile
- GuestsPage: stats grid 2→4 cols (grid-cols-2 lg:grid-cols-4), table columns hidden on mobile (md/lg breakpoints), GuestModal stats 2→4 cols on sm+
- BookingDetailPanel: full-width on mobile (w-full sm:w-[400px])
- Topbar: notifications panel full-width on mobile (w-[calc(100vw-1rem)] sm:w-96)
- LoyaltyPage, MaintenancePage, DiscountsPage, TariffsPage: stats grids grid-cols-2 lg:grid-cols-4

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/BookingsPage.tsx

@@ -187,7 +187,11 @@ export function BookingsPage() {
                   {COLUMNS.map(col => (
                     <th
                       key={col.label}
-                      className="text-left px-4 py-3 text-xs font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide"
+                      className={cn(
+                        'text-left px-4 py-3 text-xs font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide',
+                        (col.label === 'Выезд' || col.label === 'Источник') && 'hidden sm:table-cell',
+                        col.label === 'Номер' && 'hidden md:table-cell',
+                      )}
                     >
                       {col.key ? (
                         <button
@@ -221,7 +225,7 @@ export function BookingsPage() {
                         <p className="font-medium text-slate-900 dark:text-slate-100">{b.guestName}</p>
                         <p className="text-xs text-slate-500 dark:text-slate-400">{b.guestEmail}</p>
                       </td>
-                      <td className="px-4 py-3">
+                      <td className="px-4 py-3 hidden md:table-cell">
                         <p className="font-medium text-slate-900 dark:text-slate-100">
                           {r ? `№${r.number}` : '—'}
                         </p>
@@ -229,8 +233,9 @@ export function BookingsPage() {
                       </td>
                       <td className="px-4 py-3 text-slate-700 dark:text-slate-300">
                         {new Intl.DateTimeFormat('ru-RU', { day: 'numeric', month: 'short' }).format(new Date(b.checkIn))}
+                        <span className="ml-1 text-xs text-slate-400 sm:hidden">· {nights}н</span>
                       </td>
-                      <td className="px-4 py-3 text-slate-700 dark:text-slate-300">
+                      <td className="px-4 py-3 text-slate-700 dark:text-slate-300 hidden sm:table-cell">
                         <span>{new Intl.DateTimeFormat('ru-RU', { day: 'numeric', month: 'short' }).format(new Date(b.checkOut))}</span>
                         <span className="ml-1.5 text-xs text-slate-400">{nights}н</span>
                       </td>
@@ -239,7 +244,7 @@ export function BookingsPage() {
                           {BOOKING_STATUS_LABELS[b.status]}
                         </Badge>
                       </td>
-                      <td className="px-4 py-3">
+                      <td className="px-4 py-3 hidden sm:table-cell">
                         <Badge className={SOURCE_COLORS[b.source]}>
                           {SOURCE_LABELS[b.source]}
                         </Badge>