go to buffer end for TUI prompt append command

Author: ewired

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx

@@ -248,6 +248,7 @@ export function Prompt(props: PromptProps) {
   })
 
   sdk.event.on(TuiEvent.PromptAppend.type, (evt) => {
+    input.gotoBufferEnd()
     input.insertText(evt.properties.text)
   })