Reset SQL on new attempt so attempts don't concatenate in the same box

frontend/src/components/ChatPanel.tsx

@@ -416,7 +416,12 @@ export function ChatPanel() {
 
       try {
         for await (const event of streamExecuteQuery(question, taskId, previousSql)) {
-          if (event.type === 'sql') {
+          if (event.type === 'attempt_start') {
+            // New attempt — clear SQL so previous attempt's SQL doesn't bleed through
+            if ((event.attempt as number) > 1) {
+              updateMessage(msgId, { sql: '', attempts: event.attempt as number })
+            }
+          } else if (event.type === 'sql') {
             updateMessage(msgId, { sql: event.sql as string })
           } else if (event.type === 'sql_chunk') {
             // incremental SQL streaming — read current sql from store