优化上下文事件更新的处理逻辑

src/components/layout/status-bar-tokens.tsx

@@ -65,8 +65,12 @@ export function StatusBarTokens() {
     getConnSnapshot
   )
 
-  const liveContextUsed = activeConn?.usage?.used ?? null
-  const liveContextMax = activeConn?.usage?.size ?? null
+  const rawLiveUsed = activeConn?.usage?.used ?? null
+  const rawLiveSize = activeConn?.usage?.size ?? null
+  // Treat live used=0 as "no data" so we fall back to sessionStats —
+  // Claude Code sends used=0 for synthetic local commands (/context etc.)
+  const liveContextUsed = rawLiveUsed != null && rawLiveUsed > 0 ? rawLiveUsed : null
+  const liveContextMax = rawLiveSize != null && rawLiveSize > 0 ? rawLiveSize : null
 
   const contextUsed =
     liveContextUsed ?? sessionStats?.context_window_used_tokens ?? null