refactor(usage): centralize responseUsage mode

src/tui/tui-command-handlers.ts

@@ -1,5 +1,9 @@
 import type { Component, TUI } from "@mariozechner/pi-tui";
-import { formatThinkingLevels, normalizeUsageDisplay } from "../auto-reply/thinking.js";
+import {
+  formatThinkingLevels,
+  normalizeUsageDisplay,
+  resolveResponseUsageMode,
+} from "../auto-reply/thinking.js";
 import { normalizeAgentId } from "../routing/session-key.js";
 import { helpText, parseCommand } from "./commands.js";
 import type { ChatLog } from "./components/chat-log.js";
@@ -324,12 +328,7 @@ export function createCommandHandlers(context: CommandHandlerContext) {
           break;
         }
         const currentRaw = state.sessionInfo.responseUsage;
-        const current =
-          currentRaw === "full"
-            ? "full"
-            : currentRaw === "tokens" || currentRaw === "on"
-              ? "tokens"
-              : "off";
+        const current = resolveResponseUsageMode(currentRaw);
         const next =
           normalized ?? (current === "off" ? "tokens" : current === "tokens" ? "full" : "off");
         try {