style: apply prettier across fork files

check:prettier was not part of my gate routine, so formatting drift accumulated
across the session's touched files (and a few older ones). Run prettier --write
to bring the repo back to 'All matched files use Prettier code style!'.
Formatting only — no logic changes. tsc/tests/build all green.

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

src/app/features/room/message/MessageEditor.tsx

@@ -141,8 +141,7 @@ export const MessageEditor = as<'div', MessageEditorProps>(
           delete orig['m.relates_to'];
           delete orig['m.new_content'];
 
-          const filename =
-            typeof orig.filename === 'string' ? orig.filename : (editFilename ?? '');
+          const filename = typeof orig.filename === 'string' ? orig.filename : (editFilename ?? '');
           const hasFormatting = !customHtmlEqualsPlainText(customHtml, plainText);
 
           const mediaContent: IContent = { ...orig };