Adjust meeting postponement layout for mobile screens

Update the dialog to stack meeting start and end times on smaller screens, improving mobile usability.

.env.example

@@ -94,10 +94,11 @@ DATABASE_URL=postgres://tx:change-me-postgres@db:5432/tx_os
 # -----------------------------------------------------------------------------
 # Object storage
 # -----------------------------------------------------------------------------
-# Driver selection. Set to "s3" for production (MinIO/S3); "local" persists
-# uploads on the API container's filesystem (single-host, dev-only).
+# Driver selection. "local" persists uploads on the API container's
+# filesystem (works out-of-the-box for a single-host deployment like the
+# Mac mini); "s3" routes uploads to MinIO/S3 (requires the keys below).
 # If unset, the driver auto-detects: "s3" when S3_ENDPOINT is set, else "local".
-STORAGE_DRIVER=s3
+STORAGE_DRIVER=local
 
 # Bucket-level paths used by the API. Format: /<bucket>/<prefix>
 PRIVATE_OBJECT_DIR=/tx-private/private

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

@@ -1794,7 +1794,7 @@ function PostponeDialog({
                   control. Larger gap + explicit white background +
                   thicker border + min-h gives each iOS pill its own
                   clearly-bounded box so the two never collide. */}
-              <div className="grid grid-cols-2 gap-4 sm:gap-6">
+              <div className="grid grid-cols-1 sm:grid-cols-2 gap-3 sm:gap-6">
                 <div className="space-y-1.5 min-w-0">
                   <Label className="text-xs sm:text-sm font-semibold text-slate-700">
                     {t("executiveMeetings.alert.rescheduleStart")}