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/features/room/RoomInput.tsx

@@ -112,7 +112,12 @@ import {
   getImageMsgContent,
   getVideoMsgContent,
 } from './msgContent';
-import { getMemberName, getMentionContent, trimReplyFromBody } from '../../utils/room';
+import {
+  getMemberName,
+  getMentionContent,
+  sendRoomMessage,
+  trimReplyFromBody,
+} from '../../utils/room';
 import { CommandAutocomplete } from './CommandAutocomplete';
 import {
   Command,
@@ -324,7 +329,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
           // MSC3488 extensible location: send the geo_uri (legacy) alongside the
           // m.location/m.asset/m.ts blocks so Element and other clients render a
           // proper "shared location" pin instead of falling back to plain text.
-          mx.sendMessage(roomId, threadRootId ?? null, {
+          sendRoomMessage(mx, roomId, threadRootId ?? null, {
             msgtype: 'm.location',
             body: `Shared a location: ${geoUri}`,
             geo_uri: geoUri,
@@ -332,7 +337,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
             'org.matrix.msc3488.asset': { type: 'm.self' },
             'org.matrix.msc3488.ts': ts,
             'm.ts': ts,
-          } as any);
+          });
         },
         (err) => {
           setLocating(false);
@@ -363,19 +368,19 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
         if (room.hasEncryptionStateEvent()) {
           const { encInfo, file: encBlob } = await encryptFile(blob);
           const uploadResult = await mx.uploadContent(encBlob);
-          mx.sendMessage(roomId, threadRootId ?? null, {
+          sendRoomMessage(mx, roomId, threadRootId ?? null, {
             ...baseContent,
             file: { ...encInfo, url: uploadResult.content_uri },
-          } as any);
+          });
         } else {
           const uploadResult = await mx.uploadContent(blob, {
             name: 'voice-message.ogg',
             type: mimeType,
           });
-          mx.sendMessage(roomId, threadRootId ?? null, {
+          sendRoomMessage(mx, roomId, threadRootId ?? null, {
             ...baseContent,
             url: uploadResult.content_uri,
-          } as any);
+          });
         }
       },
       [mx, room, roomId, threadRootId],
@@ -625,7 +630,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
         });
         handleCancelUpload(uploads);
         const contents = fulfilledPromiseSettledResult(await Promise.allSettled(contentsPromises));
-        contents.forEach((content) => mx.sendMessage(roomId, threadRootId ?? null, content as any));
+        contents.forEach((content) => sendRoomMessage(mx, roomId, threadRootId ?? null, content));
       },
       [mx, roomId, threadRootId, selectedFiles, handleCancelUpload],
     );
@@ -732,7 +737,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
           content['m.relates_to'].is_falling_back = false;
         }
       }
-      mx.sendMessage(roomId, threadRootId ?? null, content as any);
+      sendRoomMessage(mx, roomId, threadRootId ?? null, content);
       resetEditor(editor);
       resetEditorHistory(editor);
       setCharCount(0);
@@ -955,10 +960,10 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
             const uploadRes = await mx.uploadContent(encBlob);
             const mxcUrl = (uploadRes as { content_uri: string }).content_uri;
             if (!mxcUrl) return;
-            mx.sendMessage(roomId, threadRootId ?? null, {
+            sendRoomMessage(mx, roomId, threadRootId ?? null, {
               ...baseContent,
               file: { ...encInfo, url: mxcUrl },
-            } as any);
+            });
           } else {
             const uploadRes = await mx.uploadContent(gifFile, {
               type: 'image/gif',
@@ -967,10 +972,10 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
             });
             const mxcUrl = (uploadRes as { content_uri: string }).content_uri;
             if (!mxcUrl) return;
-            mx.sendMessage(roomId, threadRootId ?? null, {
+            sendRoomMessage(mx, roomId, threadRootId ?? null, {
               ...baseContent,
               url: mxcUrl,
-            } as any);
+            });
           }
         } catch (e) {
           console.error('GIF send failed:', e instanceof Error ? e.message : 'unknown error');