chore(types): fewer any casts; eslint warning ratchet 36 -> 29 (#210)

- Developer tools (send event, state event editor, room account data) and
  setMarkedUnread go through the typed helpers in utils/room and
  utils/accountData (new setRoomAccountData) instead of casting at the
  call site; sendStateEvent accepts a developer-chosen type string.
- SecretStorage passes the key description as the SDK's
  SecretStorageKeyDescription, CallEmbed replies with an IWidgetApiRequest,
  and fillMissingPowers writes through a Record instead of `as any`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/features/common-settings/developer-tools/SendRoomEvent.tsx

@@ -1,5 +1,5 @@
 import React, { useCallback, useRef, useState, FormEventHandler, useEffect } from 'react';
-import { MatrixError } from 'matrix-js-sdk';
+import { IContent, MatrixError } from 'matrix-js-sdk';
 import {
   Box,
   Chip,
@@ -22,6 +22,7 @@ import { useTextAreaCodeEditor } from '../../../hooks/useTextAreaCodeEditor';
 import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
 import { syntaxErrorPosition } from '../../../utils/dom';
 import { Cursor } from '../../../plugins/text-area';
+import { sendRoomEvent, sendStateEvent } from '../../../utils/room';
 
 const EDITOR_INTENT_SPACE_COUNT = 2;
 
@@ -51,9 +52,9 @@ export function SendRoomEvent({ type, stateKey, requestClose }: SendRoomEventPro
     useCallback(
       (evtType, evtStateKey, evtContent) => {
         if (typeof evtStateKey === 'string') {
-          return mx.sendStateEvent(room.roomId, evtType as any, evtContent, evtStateKey);
+          return sendStateEvent(mx, room.roomId, evtType, evtContent, evtStateKey);
         }
-        return mx.sendEvent(room.roomId, evtType as any, evtContent);
+        return sendRoomEvent(mx, room.roomId, null, evtType, evtContent as IContent);
       },
       [mx, room],
     ),