Task #108 — Executive Meetings Phase 2

Schedule UI polish, full CRUD, Requests/Approvals/Tasks/Audit/PDF/Print/
Font Settings/Notifications-placeholder, audit logging on every mutation,
fine-grained RBAC, bilingual i18n.

Backend (artifacts/api-server/src/routes/executive-meetings.ts)
- All mutations transactional + audit-logged.
- Approve/reject/needs_edit use atomic UPDATE WHERE status='new' RETURNING;
  race losers return 409 RACE_ALREADY_REVIEWED.
- applyApprovedRequest() applies reschedule / change_location / add_attendee /
  remove_attendee / highlight / unhighlight / cancel_meeting / create / edit /
  delete in-tx; effective-time validation throws APPLY_VALIDATION → 400.
- Approve auto-creates linked follow_up_<reqType> task with requestId set.
- Marking a task with requestId as 'completed' propagates request → 'done'
  (in same tx, audit-logged).
- New endpoints: PUT /:id/attendees, POST /:id/duplicate,
  GET/POST /pdf-archives.

Schema (lib/db/src/schema/executive-meetings.ts)
- executive_meeting_requests.meetingId nullable so 'create' requests work.
- pdf_archives table.

Frontend (artifacts/tx-os/src/pages/executive-meetings.tsx + new
executive-meetings-print.tsx, App.tsx route)
- Schedule polish: # column, RTL order, attendees widest, navy/white/gray,
  red highlight only.
- Tabs: Manage / Requests / Approvals / Tasks / Audit / PDF / Notifications /
  Font Settings.
- Requests form now sends STRUCTURED fields (meetingDate, startTime, endTime
  for reschedule; location/url for change_location; name/title for
  add_attendee; etc.) — previously sent only {note}, which prevented apply
  from doing anything.
- Approve handler invalidates ALL ['/api/executive-meetings', *] keys + tasks.
- PDF tab lists archives; Archive snapshot button; Print opens new route.

i18n (en.json/ar.json)
- Full executiveMeetings.* key set including pdf.archive*, attendees.title/id.

Verified
- E2e regression: create meeting → reschedule request (structured) → approve
  → meeting moves to new date → task created → mark task complete → request
  becomes 'done'. Negative case (start>end) → approve rejected.
- Architect final review: PASS, no severe blockers.

Out of scope per spec: real notification delivery, real PDF rendering, iCal,
mobile polish.

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

@@ -681,6 +681,8 @@
       "attendees": {
         "label": "قائمة الحضور",
         "name": "الاسم",
+        "title": "المسمى",
+        "id": "رقم الحاضر",
         "type": "نوع الحضور",
         "add": "إضافة حاضر",
         "remove": "إزالة"
@@ -811,7 +813,11 @@
       "intro": "تستخدم هذه الواجهة طابعة المتصفح لإنتاج نسخة PDF من جدول اليوم. اختر التاريخ ثم اضغط طباعة.",
       "print": "طباعة الجدول",
       "openSchedule": "عرض الجدول",
-      "selectDate": "تاريخ الجدول"
+      "selectDate": "تاريخ الجدول",
+      "archiveSnapshot": "أرشفة نسخة",
+      "archived": "تمت أرشفة النسخة",
+      "archivesHeading": "النسخ المؤرشفة",
+      "noArchives": "لا توجد نسخ مؤرشفة لهذا التاريخ بعد."
     },
     "fontSettingsPage": {
       "heading": "إعدادات الخط",