tui: add hint for variants toggle

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

@@ -1062,7 +1062,10 @@ export function Prompt(props: PromptProps) {
               <Switch>
                 <Match when={store.mode === "normal"}>
                   <text fg={theme.text}>
-                    {keybind.print("agent_cycle")} <span style={{ fg: theme.textMuted }}>switch agent</span>
+                    {keybind.print("variant_cycle")} <span style={{ fg: theme.textMuted }}>variants</span>
+                  </text>
+                  <text fg={theme.text}>
+                    {keybind.print("agent_cycle")} <span style={{ fg: theme.textMuted }}>agents</span>
                   </text>
                   <text fg={theme.text}>
                     {keybind.print("command_list")} <span style={{ fg: theme.textMuted }}>commands</span>