fix(chat): disable autofocus on message editor

Prevents keyboard from popping up automatically on mobile devices.

src/components/ChatViewer.tsx

@@ -423,7 +423,6 @@ export function ChatViewer({
                   handleSend(content, replyTo);
                 }
               }}
-              autoFocus
               className="flex-1 min-w-0"
             />
             <Button

src/components/editor/MentionEditor.tsx

@@ -47,7 +47,7 @@ export const MentionEditor = forwardRef<
       placeholder = "Type a message...",
       onSubmit,
       searchProfiles,
-      autoFocus = true,
+      autoFocus = false,
       className = "",
     },
     ref,