Task #160: 12-hour time display for executive meetings

Switch the executive-meetings schedule time display from 24-hour
(e.g. "23:47 – 15:15") to 12-hour locale-aware format with Latin
digits in both languages:
  - EN: "11:47 PM – 3:15 PM"
  - AR: "11:47 م – 3:15 م"

Changes:
- artifacts/tx-os/src/pages/executive-meetings.tsx
  * Local formatTime() now accepts (t, lang) and routes through the
    shared i18nFormatTime helper with hour12: true.
  * TimeRangeCell now takes a lang: "ar" | "en" prop, threaded down
    from MeetingRow (isRtl ? "ar" : "en"). Fixes the runtime
    "ReferenceError: lang is not defined" from the previous attempt.
  * ManageSection list passes (isRtl ? "ar" : "en") inline.
- artifacts/tx-os/src/pages/executive-meetings-print.tsx
  * New formatPrintTime() mirrors the same conversion. Both render
    branches (full range, start-only) updated.

Out of scope (kept untouched per the plan):
- <input type="time"> form fields (still HH:mm 24h, HTML standard).
- DB schema, API, generated client.
- User clockHour12 preference, home clock, chat — all still honor
  their existing per-user setting.

Verified: tx-os tsc clean. Architect review: PASS.

artifacts/tx-os/src/pages/executive-meetings-print.tsx

@@ -1,6 +1,24 @@
 import { useEffect, useMemo, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { safeHtml } from "@/lib/safe-html";
+import { formatTime as i18nFormatTime } from "@/lib/i18n-format";
+
+/**
+ * Convert an HH:mm:ss DB string to the same 12-hour locale-aware format
+ * used by the on-screen schedule. Mirrors the helper in the main page so
+ * the print/PDF view stays in sync (e.g. "3:15 PM" / "3:15 م"). Falls
+ * back to the raw HH:mm slice if the string somehow fails to parse.
+ */
+function formatPrintTime(t: string, lang: "ar" | "en"): string {
+  const hhmm = t.slice(0, 5);
+  const parsed = new Date(`1970-01-01T${hhmm}:00`);
+  if (Number.isNaN(parsed.getTime())) return hhmm;
+  return i18nFormatTime(parsed, lang, {
+    hour: "numeric",
+    minute: "2-digit",
+    hour12: true,
+  });
+}
 
 type Attendee = {
   id: number;
@@ -209,9 +227,9 @@ export default function ExecutiveMeetingsPrintPage() {
                   const attendees = m.attendees ?? [];
                   const time =
                     m.startTime && m.endTime
-                      ? `${m.startTime.slice(0, 5)} – ${m.endTime.slice(0, 5)}`
+                      ? `${formatPrintTime(m.startTime, lang)} – ${formatPrintTime(m.endTime, lang)}`
                       : m.startTime
-                        ? m.startTime.slice(0, 5)
+                        ? formatPrintTime(m.startTime, lang)
                         : "—";
                   return (
                     <tr key={m.id} className={m.isHighlighted ? "hl" : ""}>

artifacts/tx-os/src/pages/executive-meetings.tsx

@@ -88,6 +88,7 @@ import { CSS } from "@dnd-kit/utilities";
 import { GripVertical } from "lucide-react";
 import { EditableCell } from "@/components/editable-cell";
 import { safeHtml } from "@/lib/safe-html";
+import { formatTime as i18nFormatTime } from "@/lib/i18n-format";
 
 type Attendee = {
   id?: number;
@@ -376,9 +377,21 @@ function computeCurrentMeetingId(
   return null;
 }
 
-function formatTime(t: string | null): string {
+function formatTime(t: string | null, lang: "ar" | "en"): string {
   if (!t) return "";
-  return t.slice(0, 5);
+  // DB stores HH:mm:ss (24h). Build a Date anchored to a fixed day so
+  // Intl can format the time-of-day in the user's language with AM/PM
+  // (English) or ص/م (Arabic). Latin digits are enforced via the shared
+  // formatTime helper. Falls back to the raw HH:mm slice if parsing
+  // somehow fails (defensive — shouldn't happen for our DB shape).
+  const hhmm = t.slice(0, 5);
+  const parsed = new Date(`1970-01-01T${hhmm}:00`);
+  if (Number.isNaN(parsed.getTime())) return hhmm;
+  return i18nFormatTime(parsed, lang, {
+    hour: "numeric",
+    minute: "2-digit",
+    hour12: true,
+  });
 }
 
 function todayIso(): string {
@@ -1975,6 +1988,7 @@ function MeetingRow({
             <TimeRangeCell
               meeting={meeting}
               t={t}
+              lang={isRtl ? "ar" : "en"}
               canMutate={canMutate}
               onSaveTimes={onSaveTimes}
             />
@@ -2213,11 +2227,13 @@ function MergeMenu({
 function TimeRangeCell({
   meeting,
   t,
+  lang,
   canMutate,
   onSaveTimes,
 }: {
   meeting: Meeting;
   t: (k: string) => string;
+  lang: "ar" | "en";
   canMutate: boolean;
   onSaveTimes: (
     startTime: string | null,
@@ -2310,7 +2326,7 @@ function TimeRangeCell({
   if (!editing) {
     const hasAny = !!(meeting.startTime || meeting.endTime);
     const display = hasAny
-      ? `${formatTime(meeting.startTime)} – ${formatTime(meeting.endTime)}`
+      ? `${formatTime(meeting.startTime, lang)} – ${formatTime(meeting.endTime, lang)}`
       : "—";
     return (
       <div
@@ -2978,7 +2994,7 @@ function ManageSection({
                   </div>
                 </td>
                 <td className="px-3 py-2 align-middle font-mono text-xs whitespace-nowrap">
-                  {formatTime(m.startTime)} — {formatTime(m.endTime)}
+                  {formatTime(m.startTime, isRtl ? "ar" : "en")} — {formatTime(m.endTime, isRtl ? "ar" : "en")}
                 </td>
                 <td className="px-3 py-2 align-middle text-xs">
                   {t(`executiveMeetings.manage.status.${m.status}`)}