feat: add a month calendar view to the admin bookings page

Shows a badge with the booking count on each day; clicking a date
filters the table below to that day's bookings, with a button to
clear the filter and see everything again.

src/pages/admin/AdminBookings.module.css

@@ -22,3 +22,94 @@
 .error {
   composes: error from './adminShared.module.css';
 }
+
+.calendar {
+  composes: card from './adminShared.module.css';
+  padding: var(--admin-space-lg);
+}
+
+.calendarHeader {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--admin-space-md);
+  margin-bottom: var(--admin-space-md);
+}
+
+.calendarTitle {
+  margin: 0;
+  min-width: 10rem;
+  text-align: center;
+  text-transform: capitalize;
+}
+
+.calendarGrid {
+  display: grid;
+  grid-template-columns: repeat(7, 1fr);
+  gap: var(--admin-space-xs);
+}
+
+.calendarDayLabel {
+  text-align: center;
+  font-size: 0.75rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  color: var(--admin-text-muted);
+  padding-bottom: var(--admin-space-xs);
+}
+
+.calendarCellEmpty {
+  aspect-ratio: 1;
+}
+
+.calendarCell {
+  position: relative;
+  aspect-ratio: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font: inherit;
+  color: var(--admin-text);
+  background: var(--admin-bg);
+  border: 1px solid var(--admin-border);
+  border-radius: calc(var(--admin-radius) / 2);
+  cursor: pointer;
+}
+
+.calendarCell:hover {
+  border-color: var(--admin-primary);
+}
+
+.calendarCellToday {
+  font-weight: 700;
+  border-color: var(--admin-primary);
+}
+
+.calendarCellSelected {
+  background: var(--admin-primary);
+  color: white;
+}
+
+.calendarBadge {
+  position: absolute;
+  bottom: 2px;
+  right: 2px;
+  min-width: 1.1rem;
+  height: 1.1rem;
+  padding: 0 3px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 0.65rem;
+  font-weight: 700;
+  line-height: 1;
+  border-radius: 999px;
+  background: var(--admin-danger);
+  color: white;
+}
+
+.calendarCellSelected .calendarBadge {
+  background: white;
+  color: var(--admin-primary);
+}

src/pages/admin/AdminBookings.test.tsx

@@ -85,4 +85,24 @@ describe('AdminBookings', () => {
     expect(window.confirm).toHaveBeenCalled()
     expect(updateMock).not.toHaveBeenCalled()
   })
+
+  it('shows a badge on the booking date and filters the table when clicked', async () => {
+    vi.useFakeTimers({ shouldAdvanceTime: true })
+    vi.setSystemTime(new Date('2026-09-01T12:00:00'))
+    const user = userEvent.setup({ advanceTimers: vi.advanceTimersByTime })
+    render(<AdminBookings />)
+    await screen.findByText('Jane Doe')
+
+    const dayCell = screen.getByRole('button', { name: '2026-09-15' })
+    expect(dayCell).toHaveTextContent('1')
+
+    await user.click(dayCell)
+
+    expect(screen.getByText(/réservations du 2026-09-15/i)).toBeInTheDocument()
+    expect(screen.getByText('Jane Doe')).toBeInTheDocument()
+
+    await user.click(screen.getByRole('button', { name: /voir toutes les réservations/i }))
+    expect(screen.queryByText(/réservations du 2026-09-15/i)).not.toBeInTheDocument()
+    vi.useRealTimers()
+  })
 })

src/pages/admin/AdminBookings.tsx

@@ -20,9 +20,39 @@ const STATUS_LABELS: Record<AdminBooking['status'], string> = {
   completed: 'Terminée',
 }
 
+const DAY_LABELS = ['Dim', 'Lun', 'Mar', 'Mer', 'Jeu', 'Ven', 'Sam']
+
+function toISODate(date: Date): string {
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
+  const day = String(date.getDate()).padStart(2, '0')
+  return `${year}-${month}-${day}`
+}
+
+function startOfMonth(date: Date): Date {
+  return new Date(date.getFullYear(), date.getMonth(), 1)
+}
+
+function buildMonthGrid(monthStart: Date): (Date | null)[][] {
+  const firstWeekday = monthStart.getDay()
+  const daysInMonth = new Date(monthStart.getFullYear(), monthStart.getMonth() + 1, 0).getDate()
+  const cells: (Date | null)[] = [
+    ...Array.from({ length: firstWeekday }, () => null),
+    ...Array.from({ length: daysInMonth }, (_, i) => new Date(monthStart.getFullYear(), monthStart.getMonth(), i + 1)),
+  ]
+  while (cells.length % 7 !== 0) cells.push(null)
+  const weeks: (Date | null)[][] = []
+  for (let i = 0; i < cells.length; i += 7) weeks.push(cells.slice(i, i + 7))
+  return weeks
+}
+
+const MONTH_FORMATTER = new Intl.DateTimeFormat('fr-CA', { month: 'long', year: 'numeric' })
+
 function AdminBookings() {
   const [bookings, setBookings] = useState<AdminBooking[]>([])
   const [error, setError] = useState('')
+  const [viewMonth, setViewMonth] = useState(() => startOfMonth(new Date()))
+  const [selectedDate, setSelectedDate] = useState<string | null>(null)
 
   async function loadBookings() {
     const { data, error: fetchError } = await supabase
@@ -60,10 +90,83 @@ function AdminBookings() {
     await loadBookings()
   }
 
+  const countsByDate = new Map<string, number>()
+  for (const booking of bookings) {
+    if (booking.status === 'cancelled') continue
+    countsByDate.set(booking.date, (countsByDate.get(booking.date) ?? 0) + 1)
+  }
+
+  const weeks = buildMonthGrid(viewMonth)
+  const todayISO = toISODate(new Date())
+
+  const visibleBookings = selectedDate ? bookings.filter((b) => b.date === selectedDate) : bookings
+
   return (
     <div className={styles.page}>
       <h1>Réservations</h1>
       {error && <p className={styles.error}>{error}</p>}
+
+      <div className={styles.calendar}>
+        <div className={styles.calendarHeader}>
+          <button
+            type="button"
+            aria-label="Mois précédent"
+            className={styles.buttonSecondary}
+            onClick={() => setViewMonth((m) => new Date(m.getFullYear(), m.getMonth() - 1, 1))}
+          >
+            ‹
+          </button>
+          <h2 className={styles.calendarTitle}>{MONTH_FORMATTER.format(viewMonth)}</h2>
+          <button
+            type="button"
+            aria-label="Mois suivant"
+            className={styles.buttonSecondary}
+            onClick={() => setViewMonth((m) => new Date(m.getFullYear(), m.getMonth() + 1, 1))}
+          >
+            ›
+          </button>
+        </div>
+        <div className={styles.calendarGrid}>
+          {DAY_LABELS.map((label) => (
+            <div key={label} className={styles.calendarDayLabel}>{label}</div>
+          ))}
+          {weeks.flatMap((week, weekIndex) =>
+            week.map((date, dayIndex) => {
+              if (!date) return <div key={`${weekIndex}-${dayIndex}`} className={styles.calendarCellEmpty} />
+              const iso = toISODate(date)
+              const count = countsByDate.get(iso) ?? 0
+              const isSelected = selectedDate === iso
+              const isToday = iso === todayISO
+              return (
+                <button
+                  type="button"
+                  key={iso}
+                  aria-label={iso}
+                  className={[
+                    styles.calendarCell,
+                    isSelected ? styles.calendarCellSelected : '',
+                    isToday ? styles.calendarCellToday : '',
+                  ].join(' ')}
+                  onClick={() => setSelectedDate(isSelected ? null : iso)}
+                >
+                  <span>{date.getDate()}</span>
+                  {count > 0 && <span className={styles.calendarBadge}>{count}</span>}
+                </button>
+              )
+            }),
+          )}
+        </div>
+      </div>
+
+      {selectedDate && (
+        <p>
+          Réservations du {selectedDate}{' '}
+          <button type="button" className={styles.buttonSecondary} onClick={() => setSelectedDate(null)}>
+            Voir toutes les réservations
+          </button>
+        </p>
+      )}
+
       <table className={styles.table}>
         <thead>
           <tr>
@@ -76,7 +179,7 @@ function AdminBookings() {
           </tr>
         </thead>
         <tbody>
-          {bookings.map((booking) => (
+          {visibleBookings.map((booking) => (
             <tr key={booking.id}>
               <td>{booking.date}</td>
               <td>{booking.time}</td>