Token counts render Chinese units (万/千/百) when locale is "en"

[JoshBolding]

Summary

With the app language set to English ("locale": "en" in settings.json), token counts render using Chinese myriad units. The context-window chip shows the Grok 4.6 window as 50万 instead of 500K, while every surrounding string ("Context window", "Provided by Grok CLI") is correctly in English.

Environment

• Grok App v0.2.18, Windows x64 portable build
• Windows 11
• settings.json → "locale": "en"
• Grok Build CLI 1.0.3

Root cause

formatTokenCount() in src/lib/contextUsage.ts:726 has no English branch. The locale argument is only used to choose between Simplified and Traditional Chinese:

export function formatTokenCount(n: number, locale: string = "zh"): string {
  const isTw = locale === "zh-TW" || /* ...zh-hant... */;
  const wan = isTw ? "萬" : "万";
  const yi  = isTw ? "億" : "亿";
  if (whole >= 100_000_000) return `...${yi}`;
  if (whole >= 10_000)      return `...${wan}`;
  if (whole >= 1_000)       return `...千`;  // not locale-gated
  if (whole >= 100)         return `...百`;  // not locale-gated
  return String(whole);
}

For locale === "en", isTw is false, so wan resolves to "万". The 千 and 百 branches are unconditional and apply to every locale.

The surrounding plumbing is correct — AppWorkbench.tsx:20615 does pass locale={locale}, and that value resolves to "en". The formatter itself is the only gap.

formatContextChipLabel() (src/lib/contextUsage.ts:750) carries the same locale: string = "zh" default and inherits the behavior.

Expected vs actual (locale en)

tokens	current	expected
500,000	50万	500K
12,400	1.2万	12.4K
1,000,000	100万	1M
5,000	5千	5K
300	3百	300

Suggested fix

Add an English K/M/B path ahead of the CJK bands, gated on the locale not starting with zh.

Existing tests in src/lib/contextUsage.test.ts:43-64 cover only Chinese (handles edge and Chinese scale bands (百/千/万/亿) and uses 萬/億 for zh-TW), so an en case would lock this in.

Happy to send a PR if that would help.

[RongleCat]

Thanks for the precise write-up — reproduced in code on v0.2.18.

Root cause: formatTokenCount (and the account formatLocaleCount / formatCompactNumber wrappers) only used locale to pick 万 vs 萬. Non-zh locales, including product-default en, still hit the 百/千/万 bands. A few callers (composer model menu, phone tools sheet, account heatmap) also dropped or forced zh.

Fix: #614 — English / other non-zh locales use K/M/B (500K, 1M); zh / zh-TW keep 万·萬 / 亿·億. Tests lock the table from this issue.

Please switch language to English after the next build and confirm the context-window chip no longer shows 50万.