fix: preserve whitespace in chat input during editing (#361)

Fixes #360.

Co-authored-by: Håkon Harnes <hakonh@basis.no>

Author: hakonharnes

src/components/mention-input.tsx

@@ -180,7 +180,7 @@ export default function MentionInput({
         };
         onChange?.({
           json,
-          text: text.trim(),
+          text,
           mentions,
         });
       },