Executive Meetings: inline editing, drag reorder, and current-meeting highlight

Implements Task #122 — four features on the Executive Meetings schedule:
1. Word-like inline editing of meeting title and attendee names with bold,
   italic, underline, color, font-family, font-size, and text-align controls
   (Tiptap-backed EditableCell + FormattingToolbar).
2. Drag-to-reorder column headers (dnd-kit), persisted in the existing
   em-schedule-cols-v1 storage key. Old up/down buttons removed.
3. Drag-to-reorder rows within a day. New POST /api/executive-meetings/reorder
   endpoint permutes daily_number + start/end times in a single transaction
   using a two-phase negative→final assignment that respects the
   (date, daily_number) UNIQUE constraint and survives partial-day reorders.
   Audit-logged and role-guarded.
4. Highlight the meeting whose start/end window is "now", refreshed every
   60 s. Toggle and color picker live in the customize popover and persist
   to localStorage (em-current-meeting-highlight-v1).

Backend changes
- Widened titleAr / titleEn / attendees.name to text.
- New artifacts/api-server/src/lib/sanitize.ts with an allowlist for
  inline tags + safe inline styles. Applied to POST, PATCH, PUT-attendees,
  duplicate, reorder, and applyApprovedRequest (add_attendee) paths so
  rich text round-trips safely.
- Code-review fixes: duplicate handler re-sanitizes titleAr/titleEn;
  applyApprovedRequest add_attendee sanitizes the inserted name;
  reorder transaction return value cleaned (`byId` removed).
- 5 new tests cover sanitization stripping, reorder happy path, cross-day
  rejection, permission denial, and applyApprovedRequest sanitization.
  Pre-existing app_permissions failures are unrelated (tracked by #126/#127).

Frontend changes
- artifacts/tx-os/src/components/editable-cell.tsx with FormattingToolbar
  (custom FontSize Tiptap extension + @tiptap/extension-text-align).
- ScheduleSection wires saveTitle, saveAttendeeName, reorder mutation
  (optimistic with revert on error), highlight tick, and HighlightPrefs.
- New SortableHeader component for column drag.
- AttendeesCell passes the original attendee index to PUT writes so edits
  reach the right row even after grouping into virtual/internal/external.
- Print page renders sanitized rich text via dangerouslySetInnerHTML on
  names and titles; attendee.title is rendered as a plain text node (XSS).
- Translation keys added in ar.json and en.json.

artifacts/api-server/tests/executive-meetings.test.mjs

@@ -585,9 +585,6 @@ test("Sanitization: text-align on <p> survives a round-trip via PATCH/GET", asyn
     titleAr: "محاذاة", titleEn: "Align", meetingDate: today,
   });
   const M = await m.json(); created.meetingIds.push(M.id);
-  // Tiptap's TextAlign extension emits paragraphs like
-  // <p style="text-align: right">…</p>. The sanitizer must allow that
-  // structure so Word-like alignment persists.
   const html = '<p style="text-align: right">يمين</p><p style="text-align: center">center</p>';
   const patch = await api(adminCookie, "PATCH",
     `/api/executive-meetings/${M.id}`, { titleAr: html });
@@ -604,7 +601,6 @@ test("Sanitization: text-align on <p> survives a round-trip via PATCH/GET", asyn
 });
 
 test("Reorder: POST /reorder renumbers a full day to 1..N and inherits slot times", async () => {
-  // Use a fresh future date to guarantee the reorder is full-day.
   const reorderDate = "2050-01-15";
   const a = await api(adminCookie, "POST", "/api/executive-meetings", {
     titleAr: "أول", titleEn: "First", meetingDate: reorderDate,
@@ -638,16 +634,12 @@ test("Reorder: POST /reorder renumbers a full day to 1..N and inherits slot time
   const cAfter = byId.get(C.id);
   const bAfter = byId.get(B.id);
   const aAfter = byId.get(A.id);
-  // Full-day reorder => dailyNumber recomputed as 1..N in the new order;
-  // each row inherits the corresponding slot's start/end time.
   assert.equal(cAfter.dailyNumber, 1);
   assert.equal(bAfter.dailyNumber, 2);
   assert.equal(aAfter.dailyNumber, 3);
   assert.equal(cAfter.startTime.slice(0, 5), "09:00");
   assert.equal(bAfter.startTime.slice(0, 5), "10:00");
   assert.equal(aAfter.startTime.slice(0, 5), "11:00");
-  // The reorder route must write an audit row with the namespaced action
-  // `executive_meeting.reorder` so downstream filters can target it.
   const auditRows = await pool.query(
     `SELECT action, entity_type, entity_id, new_value
        FROM executive_meeting_audit_logs
@@ -664,9 +656,6 @@ test("Reorder: POST /reorder renumbers a full day to 1..N and inherits slot time
 });
 
 test("Reorder: rejects orderedIds containing duplicates with code duplicate_ids", async () => {
-  // Even though full-day membership would otherwise be satisfied, sending the
-  // same id twice must be refused so we never assign the same dailyNumber to
-  // two distinct rows during the two-phase renumber.
   const reorderDate = "2050-04-04";
   const a = await api(adminCookie, "POST", "/api/executive-meetings", {
     titleAr: "أ", titleEn: "A", meetingDate: reorderDate,