fix(mobile): apply useModalStyle to 7 more modal dialogs

ScheduleMessageModal, PollCreator, JoinAddressPrompt, JumpToTime,
EditHistoryModal, ForwardMessageDialog, RemindMeDialog — all now
render fullscreen on mobile (≤750px) and as a capped-width box on
desktop, consistent with the existing useModalStyle pattern.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/message/RemindMeDialog.tsx

@@ -17,6 +17,7 @@ import {
 } from 'folds';
 import { stopPropagation } from '../../../utils/keyboard';
 import { useReminders } from '../../../hooks/useReminders';
+import { useModalStyle } from '../../../hooks/useModalStyle';
 
 type RemindMeDialogProps = {
   roomId: string;
@@ -39,6 +40,7 @@ function getPresets(): Array<{ label: string; ms: number }> {
 }
 
 export function RemindMeDialog({ roomId, eventId, previewText, onClose }: RemindMeDialogProps) {
+  const modalStyle = useModalStyle(320);
   const { addReminder } = useReminders();
   // eslint-disable-next-line react-hooks/exhaustive-deps
   const presets = useMemo(() => getPresets(), []);
@@ -73,8 +75,7 @@ export function RemindMeDialog({ roomId, eventId, previewText, onClose }: Remind
               background: color.Surface.Container,
               borderRadius: config.radii.R400,
               boxShadow: color.Other.Shadow,
-              width: '100vw',
-              maxWidth: 280,
+              ...modalStyle,
               overflow: 'hidden',
             }}
           >