DP16: add typed get/setAccountData helpers, remove ~19 any-casts

Add centralized typed helpers in src/app/utils/accountData.ts:
- getAccountData<T>(mx, eventType): T | undefined (returns content)
- setAccountData<T>(mx, eventType, content): Promise<void>

These wrap the single `as any` cast needed because matrix-js-sdk's typed
overloads reject the fork's custom account-data event names. Every call site
now stays fully typed on its content shape.

Route all account-data reads/writes that previously used
`(mx as any).getAccountData/setAccountData` or `mx.getAccountData(... as any)`
through the helpers (or, where a MatrixEvent is needed, through the existing
utils/room.ts getAccountData whose param is widened to accept string keys).
No behavior change: same event types, same content shapes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/hooks/useAccountData.ts

@@ -2,11 +2,12 @@ import { MatrixEvent } from 'matrix-js-sdk';
 import { useState, useCallback } from 'react';
 import { useMatrixClient } from './useMatrixClient';
 import { useAccountDataCallback } from './useAccountDataCallback';
+import { getAccountData } from '../utils/room';
 
 export function useAccountData(eventType: string): MatrixEvent | undefined {
   const mx = useMatrixClient();
-  const [event, setEvent] = useState<MatrixEvent | undefined>(
-    () => (mx as any).getAccountData(eventType) as MatrixEvent | undefined,
+  const [event, setEvent] = useState<MatrixEvent | undefined>(() =>
+    getAccountData(mx, eventType),
   );
 
   useAccountDataCallback(

src/app/hooks/useBookmarks.ts

@@ -1,6 +1,7 @@
 import { useCallback, useEffect, useState } from 'react';
 import { ClientEvent, ClientEventHandlerMap, MatrixClient } from 'matrix-js-sdk';
 import { useMatrixClient } from './useMatrixClient';
+import { getAccountData, setAccountData } from '../utils/accountData';
 
 export type Bookmark = {
   roomId: string;
@@ -18,10 +19,7 @@ type BookmarksContent = {
 };
 
 function readBookmarks(mx: MatrixClient): Bookmark[] {
-  return (
-    (mx.getAccountData(BOOKMARKS_KEY as any)?.getContent() as BookmarksContent | undefined)
-      ?.bookmarks ?? []
-  );
+  return getAccountData<BookmarksContent>(mx, BOOKMARKS_KEY)?.bookmarks ?? [];
 }
 
 // Module-scoped serialization state.
@@ -85,7 +83,7 @@ function enqueueBookmarkWrite(
     const next = compute(state.latest);
     state.latest = next;
     state.listeners.forEach((listener) => listener(next));
-    await (mx as any).setAccountData(BOOKMARKS_KEY, { bookmarks: next });
+    await setAccountData(mx, BOOKMARKS_KEY, { bookmarks: next });
   });
   // Keep the chain alive even if one write rejects, but propagate the
   // rejection to this caller so it can react (e.g. retry).

src/app/hooks/useReminders.ts

@@ -1,6 +1,7 @@
 import { useCallback, useEffect, useState } from 'react';
 import { ClientEvent, ClientEventHandlerMap, MatrixClient } from 'matrix-js-sdk';
 import { useMatrixClient } from './useMatrixClient';
+import { getAccountData, setAccountData } from '../utils/accountData';
 
 export type Reminder = {
   roomId: string;
@@ -16,10 +17,7 @@ type RemindersContent = {
 };
 
 function readReminders(mx: MatrixClient): Reminder[] {
-  return (
-    (mx.getAccountData(REMINDERS_KEY as any)?.getContent() as RemindersContent | undefined)
-      ?.reminders ?? []
-  );
+  return getAccountData<RemindersContent>(mx, REMINDERS_KEY)?.reminders ?? [];
 }
 
 // Module-scoped serialization state.
@@ -83,7 +81,7 @@ function enqueueReminderWrite(
     const next = compute(state.latest);
     state.latest = next;
     state.listeners.forEach((listener) => listener(next));
-    await (mx as any).setAccountData(REMINDERS_KEY, { reminders: next });
+    await setAccountData(mx, REMINDERS_KEY, { reminders: next });
   });
   // Keep the chain alive even if one write rejects, but propagate the
   // rejection to this caller so it can react (e.g. retry).

src/app/hooks/useRoomMeta.ts

@@ -4,6 +4,7 @@ import { ClientEvent, MatrixEvent, Room, RoomEvent, RoomEventHandlerMap } from '
 import { StateEvent } from '../../types/matrix/room';
 import { useStateEvent } from './useStateEvent';
 import { useMatrixClient } from './useMatrixClient';
+import { getAccountData } from '../utils/accountData';
 
 export const useRoomAvatar = (room: Room, dm?: boolean): string | undefined => {
   const avatarEvent = useStateEvent(room, StateEvent.RoomAvatar);
@@ -42,9 +43,7 @@ export type LocalRoomNamesContent = { rooms: Record<string, string> };
 export function getLocalRoomNamesContent(
   mx: ReturnType<typeof useMatrixClient>,
 ): LocalRoomNamesContent {
-  // Use any-cast because LOCAL_ROOM_NAMES_KEY is not in matrix-js-sdk AccountDataEvents
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  const raw: unknown = (mx as any).getAccountData(LOCAL_ROOM_NAMES_KEY)?.getContent();
+  const raw: unknown = getAccountData<unknown>(mx, LOCAL_ROOM_NAMES_KEY);
   if (
     raw &&
     typeof raw === 'object' &&

src/app/hooks/useThreadNotifications.ts

@@ -12,6 +12,7 @@ import {
 } from '../utils/threadNotifications';
 import { useMatrixClient } from './useMatrixClient';
 import { AsyncState, useAsyncCallback } from './useAsyncCallback';
+import { getAccountData, setAccountData } from '../utils/accountData';
 
 /** Read the current notification mode for a thread from the bound atom. */
 export function useThreadNotificationMode(
@@ -23,9 +24,7 @@ export function useThreadNotificationMode(
 }
 
 const readContent = (mx: MatrixClient): ThreadNotificationsContent =>
-  ((mx as any).getAccountData(AccountDataEvent.LotusThreadNotifications)?.getContent() as
-    | ThreadNotificationsContent
-    | undefined) ?? {};
+  getAccountData<ThreadNotificationsContent>(mx, AccountDataEvent.LotusThreadNotifications) ?? {};
 
 const getJoinedRoomIds = (mx: MatrixClient): Set<string> => {
   const joined = new Set<string>();
@@ -74,7 +73,7 @@ const writeThreadNotificationMode = async (
   // ALWAYS prune before persisting to keep account data bounded.
   const finalContent = pruneThreadNotifications(next, getJoinedRoomIds(mx), now);
 
-  await (mx as any).setAccountData(AccountDataEvent.LotusThreadNotifications, finalContent);
+  await setAccountData(mx, AccountDataEvent.LotusThreadNotifications, finalContent);
 };
 
 export function useSetThreadNotificationMode(

src/app/hooks/useUserNotes.ts

@@ -1,6 +1,7 @@
 import { useCallback, useEffect, useState } from 'react';
 import { ClientEvent, ClientEventHandlerMap, MatrixClient } from 'matrix-js-sdk';
 import { useMatrixClient } from './useMatrixClient';
+import { getAccountData, setAccountData } from '../utils/accountData';
 
 const NOTES_KEY = 'io.lotus.user_notes';
 export const USER_NOTE_MAX_LENGTH = 500;
@@ -8,7 +9,7 @@ export const USER_NOTE_MAX_LENGTH = 500;
 type UserNotesContent = Record<string, string>;
 
 function readNotes(mx: MatrixClient): UserNotesContent {
-  return (mx.getAccountData(NOTES_KEY as any)?.getContent() as UserNotesContent | undefined) ?? {};
+  return getAccountData<UserNotesContent>(mx, NOTES_KEY) ?? {};
 }
 
 // Module-scoped serialization state.
@@ -72,7 +73,7 @@ function enqueueNotesWrite(
     const next = compute(state.latest);
     state.latest = next;
     state.listeners.forEach((listener) => listener(next));
-    await (mx as any).setAccountData(NOTES_KEY, next);
+    await setAccountData(mx, NOTES_KEY, next);
   });
   // Keep the chain alive even if one write rejects, but propagate the
   // rejection to this caller so it can react (e.g. retry).