Task #716: Booking slots — edit dialog + compact numbered table

- SlotsAdminSection (artifacts/tx-os/src/pages/protocol.tsx): replaced the
  2-column card grid of booking slots with a compact shadcn Table sorted by
  startTime: # | time range | duration | days | status | actions.
  Rows are dense (py-1.5, small text, h-7 icon buttons), RTL/LTR safe.
- New edit flow: pencil button opens a Dialog to change start time, duration
  (5–480, step 5) and days-of-week (same day-chip UI as the generator).
  Saves via existing PATCH /api/protocol/booking-slots/:id (no backend
  changes needed — route already accepted startTime/durationMinutes/daysOfWeek).
  409 duplicate_slot shows a dedicated destructive toast; other errors fall
  back to the shared onError. Invalidates slots-admin + parent slots queries.
- i18n: new keys under protocol.slots in ar.json/en.json (colTime, colStatus,
  colActions, edit, editTitle, editSaved, duplicateSlot, durationValue with
  full Arabic plural categories).
- tsc --noEmit passes for tx-os. Architect review: Pass; added the suggested
  <=480 client-side duration guard.
- Follow-up #717 proposed (UI test for edit + 409 toast).

artifacts/tx-os/src/locales/ar.json

@@ -1968,7 +1968,20 @@
       "generated": "تم توليد {{created}} وقتًا، ودمج الأيام في {{merged}}، وتجاهل {{skipped}} مكررًا.",
       "generatedNone": "لا جديد — كل الأوقات والأيام موجودة مسبقًا.",
       "pickDay": "اختر يومًا واحدًا على الأقل",
-      "noSlotsForDay": "لا توجد أوقات متاحة في هذا اليوم"
+      "noSlotsForDay": "لا توجد أوقات متاحة في هذا اليوم",
+      "colTime": "الوقت",
+      "colStatus": "الحالة",
+      "colActions": "إجراءات",
+      "edit": "تعديل",
+      "editTitle": "تعديل وقت الحجز",
+      "editSaved": "تم حفظ التعديل",
+      "duplicateSlot": "يوجد وقت حجز يبدأ في نفس التوقيت.",
+      "durationValue_zero": "{{count}} دقيقة",
+      "durationValue_one": "دقيقة واحدة",
+      "durationValue_two": "دقيقتان",
+      "durationValue_few": "{{count}} دقائق",
+      "durationValue_many": "{{count}} دقيقة",
+      "durationValue_other": "{{count}} دقيقة"
     }
   }
 }