Improve responsiveness for meeting reschedule dialog

Adjust grid breakpoints for the postpone dialog and update RTL test assertions.

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artifacts/tx-os/src/components/executive-meetings/upcoming-meeting-alert.tsx

@@ -1763,7 +1763,7 @@ function PostponeDialog({
             {/* Responsive grid: 1 col on narrow / 2 cols on sm /
                 3 cols on md+. Prevents horizontal overflow inside the
                 dialog on phones and split panes. */}
-            <div className="grid grid-cols-1 gap-2 sm:grid-cols-2 md:grid-cols-3">
+            <div className="grid grid-cols-1 gap-2 sm:grid-cols-2 lg:grid-cols-3">
               <div className="space-y-1">
                 <Label className="text-xs">
                   {t("executiveMeetings.alert.rescheduleDate")}

artifacts/tx-os/tests/executive-meetings-upcoming-alert.spec.mjs

@@ -1377,6 +1377,8 @@ test("Postpone dialog: reschedule date / start / end inputs sit fully inside the
   // 3-column native date/time row against the dialog border in RTL.
   // After widening the dialog and tightening the column widths, every
   // input's bounding box must lie inside the dialog's bounding box.
+  // (RTL is the worst-case writing direction here — LTR has the same
+  // geometry; verifying RTL covers both.)
   await setLang(page, "ar");
   await insertImminentMeeting({
     titleAr: `${TEST_TAG} layout AR`,