Task #733: dark outline around expanded booking + its details; removed "اسم الاجتماع" label

- protocol.tsx renderBookingRow: when expanded, the booking row gets
  border-2 border-b-0 border-slate-500 and the details row gets
  !border-2 !border-t-0 !border-slate-500 — one continuous dark frame
  around the whole block. Important modifiers on the details row defeat
  TableBody's [&_tr:last-child]:border-0 reset so the frame survives when
  the expanded booking is the last row (architect review fix). Removed the
  old inner border-b slate-400 on the details container.
- Details card header: removed the small "اسم الاجتماع" label span; only
  the meeting title (b.title, centered, bold) remains.
- Deleted the now-unused protocol.bookings.table.title key from ar.json
  and en.json (verified no remaining usages, JSON parses).
- UI-only; tsc --noEmit clean.

artifacts/tx-os/src/pages/protocol.tsx

@@ -1044,6 +1044,7 @@ export default function ProtocolPage() {
             bookingIsToday
               ? "bg-emerald-50/60 hover:bg-emerald-50"
               : "odd:bg-white even:bg-slate-50/60",
+            expanded && "border-2 border-b-0 border-slate-500",
           )}
           data-testid={`booking-row-${b.id}`}
         >
@@ -1218,13 +1219,13 @@ export default function ProtocolPage() {
           </TableCell>
         </TableRow>
         {expanded && (
-          <TableRow key={`${b.id}-details`} className="border-b-0 bg-slate-50/80">
+          <TableRow
+            key={`${b.id}-details`}
+            className="!border-2 !border-t-0 !border-slate-500 bg-slate-50/80"
+          >
             <TableCell colSpan={detailColSpan} className="p-0">
-              <div className="overflow-hidden border-b border-slate-400 bg-white">
+              <div className="overflow-hidden bg-white">
                 <div className="border-b border-slate-300 bg-slate-50 px-4 py-2.5 text-center">
-                  <span className="text-[11px] text-slate-400">
-                    {t("protocol.bookings.table.title")}
-                  </span>
                   <div className="text-sm font-bold text-slate-900">
                     {b.title}
                   </div>