refactor(types): typed send helpers replace 16 as any casts (#210)

- sendRoomMessage (composer's fire-and-forget sends: text, location, voice,
  files, GIFs) and sendRoomEvent (polls, poll responses/ends, forwards,
  reactions, edits) in utils/room.ts carry the one cast each needs
  (`keyof TimelineEvents` / `RoomMessageEventContent`, no `any`).
- sendRoomMessage also swallows the rejected promise: a failed send already
  shows on the local echo (Failed to send + Retry, or the consent prompt), so
  it no longer surfaces as an unhandled error in the console.
- getAccountData narrows to `keyof AccountDataEvents`; ForwardMessageDialog's
  guard now narrows `contentToSend` itself (same behaviour).
- `as any` 39 → 23; eslint warnings 46 → 36, ratchet tightened to 36.

Verified in Chromium on a local Synapse: a text message, a quick reaction and
an edit all reach the server with the right content; a consent-blocked send
no longer logs an unhandled MatrixError. 1219 unit tests pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/components/message/content/PollContent.tsx

@@ -1,10 +1,9 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
 import React, { KeyboardEvent, useCallback, useEffect, useMemo, useState } from 'react';
 import { Box, Chip, color, config, Icon, Icons, Text, toRem } from 'folds';
 import { RelationsEvent } from 'matrix-js-sdk/lib/models/relations';
 import { MatrixEvent, Room, RoomEvent, PollEvent } from 'matrix-js-sdk';
 import { useMatrixClient } from '../../../hooks/useMatrixClient';
-import { getMemberName } from '../../../utils/room';
+import { getMemberName, sendRoomEvent } from '../../../utils/room';
 import {
   ParsedPoll,
   PollResponse,
@@ -220,7 +219,7 @@ export function PollContent({
     setPending(next);
     // Send the STABLE m.poll.response (matches Lotus's stable m.poll.start; the reader
     // accepts both namespaces).
-    mx.sendEvent(roomId, 'm.poll.response' as any, {
+    sendRoomEvent(mx, roomId, null, 'm.poll.response', {
       'm.relates_to': { rel_type: 'm.reference', event_id: eventId },
       'm.selections': Array.from(next),
     }).catch(() => setPending(null));
@@ -229,7 +228,7 @@ export function PollContent({
   const handleEndPoll = () => {
     if (!roomId || !eventId || ending) return;
     setEnding(true);
-    mx.sendEvent(roomId, 'm.poll.end' as any, {
+    sendRoomEvent(mx, roomId, null, 'm.poll.end', {
       'm.relates_to': { rel_type: 'm.reference', event_id: eventId },
       'm.poll.end': {},
       'm.text': 'The poll has ended.',