fix: pass SQL directly in AI execute to avoid stale state (#153)

When executing SQL from the AI panel, pass the SQL string directly to
tryExecute() instead of relying on the executableSql computed property,
which could use stale selectedSql or cursorPos values.

src/App.vue

@@ -320,7 +320,8 @@ function onAiReplaceSql(sql: string) {
 function onAiExecuteSql(sql: string) {
   const tabId = ensureQueryTab();
   queryStore.updateSql(tabId, sql);
-  nextTick(() => tryExecute());
+  selectedSql.value = "";
+  nextTick(() => tryExecute(sql));
 }
 
 function handleKeydown(e: KeyboardEvent) {