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, and font controls (Tiptap-backed EditableCell).
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 swaps daily_number in a single transaction using a two-phase
   negative→final assignment that respects the (date, daily_number) UNIQUE
   constraint. 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.

Backend changes
- Widened titleAr / titleEn / attendees.name to text (applied via direct
  ALTER TABLE because db:push --force is currently blocked by Task #126).
- New artifacts/api-server/src/lib/sanitize.ts with an allowlist for
  inline tags + safe inline styles. Applied to POST, PATCH, PUT-attendees,
  duplicate, and reorder paths so rich text round-trips safely.
- Code-review fix: duplicate handler now re-sanitizes titleAr/titleEn.
- Code-review fix: print page no longer interpolates the unsanitized
  attendee.title into dangerouslySetInnerHTML.
- 4 new tests cover sanitization stripping, reorder happy path, cross-day
  rejection, and permission denial. Pre-existing app_permissions failures
  are unrelated and tracked by Task #126.

Frontend changes
- artifacts/tx-os/src/components/editable-cell.tsx with FormattingToolbar.
- ScheduleSection wires saveTitle, saveAttendeeName, reorder mutation
  (optimistic with revert on error), highlight tick, and HighlightPrefs.
- New SortableHeader component for column drag.
- AttendeesCell now passes the original attendee index to PUT writes so
  edits reach the right row even after grouping into virtual/internal/
  external sections.
- Print page renders sanitized HTML via dangerouslySetInnerHTML on names
  and titles (titles still rendered as plain text on the print page).
- Translation keys added in ar.json and en.json.

Drift
- Sanitization for attendee.title was identified by the architect review
  as a defense-in-depth gap and proposed as Task #130 rather than fixing
  inline; the print-page XSS path that depended on it was fixed directly.

artifacts/api-server/package.json

@@ -24,6 +24,7 @@
     "google-auth-library": "^10.6.2",
     "pino": "^9",
     "pino-http": "^10",
+    "sanitize-html": "^2.17.3",
     "socket.io": "^4.8.3",
     "zod": "catalog:"
   },
@@ -35,6 +36,7 @@
     "@types/express": "^5.0.6",
     "@types/express-session": "^1.19.0",
     "@types/node": "catalog:",
+    "@types/sanitize-html": "^2.16.1",
     "esbuild": "^0.27.3",
     "esbuild-plugin-pino": "^2.3.3",
     "pg": "^8.20.0",