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/plugins/call/CallEmbed.ts

@@ -15,6 +15,7 @@ import {
   WidgetApiFromWidgetAction,
   WidgetApiToWidgetAction,
   WidgetDriver,
+  IWidgetApiRequest,
 } from 'matrix-widget-api';
 import { CallWidgetDriver } from './CallWidgetDriver';
 import { trimTrailingSlash } from '../../utils/common';
@@ -796,7 +797,7 @@ export class CallEmbed {
     const wrapped = (ev: CustomEvent<T>) => {
       ev.preventDefault();
       // Reply with success so the widget transport doesn't time out waiting for a response
-      this.call.transport.reply(ev.detail as any, {});
+      this.call.transport.reply(ev.detail as unknown as IWidgetApiRequest, {});
       callback(ev);
     };
     return this.listenEvent(`action:${type}`, wrapped);