fix(formatters): use active locale for money/time/relative formatting (P2-29, P2-30)

Pull locale from useAppStore.getState() so zh users get zh-CN number/date
formatting and Chinese relative-time strings; drop en-US lock.

src/renderer/lib/formatters.ts

@@ -1,6 +1,15 @@
+import { useAppStore } from "../state/store";
+
+function getActiveLocale(): string {
+  return useAppStore.getState().locale === "zh" ? "zh-CN" : "en-US";
+}
+
 export function formatMoney(value: number | null | undefined) {
-  if (typeof value !== "number" || Number.isNaN(value)) return "$0.00";
-  return new Intl.NumberFormat("en-US", {
+  const locale = getActiveLocale();
+  if (typeof value !== "number" || Number.isNaN(value)) {
+    return new Intl.NumberFormat(locale, { style: "currency", currency: "USD", minimumFractionDigits: 2 }).format(0);
+  }
+  return new Intl.NumberFormat(locale, {
     style: "currency",
     currency: "USD",
     minimumFractionDigits: 2,
@@ -8,23 +17,24 @@ export function formatMoney(value: number | null | undefined) {
 }
 
 export function formatTime(value: string | null | undefined) {
-  if (!value) return "Not yet";
-  return new Date(value).toLocaleString();
+  if (!value) return useAppStore.getState().locale === "zh" ? "未开始" : "Not yet";
+  return new Date(value).toLocaleString(getActiveLocale());
 }
 
 export function timeAgo(dateStr: string | null): string {
-  if (!dateStr) return "never";
+  if (!dateStr) return useAppStore.getState().locale === "zh" ? "从未" : "never";
   const now = Date.now();
   const then = new Date(dateStr).getTime();
   const diff = Math.max(0, now - then);
   const seconds = Math.floor(diff / 1000);
-  if (seconds < 60) return "just now";
+  const isZh = useAppStore.getState().locale === "zh";
+  if (seconds < 60) return isZh ? "刚刚" : "just now";
   const minutes = Math.floor(seconds / 60);
-  if (minutes < 60) return `${minutes}m ago`;
+  if (minutes < 60) return isZh ? `${minutes}分钟前` : `${minutes}m ago`;
   const hours = Math.floor(minutes / 60);
-  if (hours < 24) return `${hours}h ago`;
+  if (hours < 24) return isZh ? `${hours}小时前` : `${hours}h ago`;
   const days = Math.floor(hours / 24);
-  return `${days}d ago`;
+  return isZh ? `${days}天前` : `${days}d ago`;
 }
 
 export function getAgentInitials(name: string): string {
@@ -46,15 +56,15 @@ export function formatDuration(seconds: number): string {
 }
 
 export function formatMessageTime(dateStr: string): string {
+  const locale = getActiveLocale();
   const d = new Date(dateStr);
   const now = new Date();
+  const time = d.toLocaleTimeString(locale, { hour: "2-digit", minute: "2-digit" });
   const isToday =
     d.getDate() === now.getDate() &&
     d.getMonth() === now.getMonth() &&
     d.getFullYear() === now.getFullYear();
-  if (isToday) {
-    return d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
-  }
+  if (isToday) return time;
   const yesterday = new Date(now);
   yesterday.setDate(yesterday.getDate() - 1);
   const isYesterday =
@@ -62,9 +72,8 @@ export function formatMessageTime(dateStr: string): string {
     d.getMonth() === yesterday.getMonth() &&
     d.getFullYear() === yesterday.getFullYear();
   if (isYesterday) {
-    return `Yesterday ${d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" })}`;
+    const rtf = new Intl.RelativeTimeFormat(locale, { numeric: "auto" });
+    return `${rtf.format(-1, "day")} ${time}`;
   }
-  return d.toLocaleDateString([], { month: "short", day: "numeric" }) +
-    " " +
-    d.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
+  return `${d.toLocaleDateString(locale, { month: "short", day: "numeric" })} ${time}`;
 }