优化: 空闲 CPU 归零，事件驱动渲染+输入等待

.gitignore

@@ -23,3 +23,4 @@ Thumbs.db
 *.exe
 *.exe.old
 *~
+u-tabs.prof

internal/app.go

@@ -108,6 +108,10 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.update.Checking = false
 	case cacheFlushMsg:
 		m.flushCache()
+		// 只在仍有脏数据时继续调度，避免空转
+		if m.cacheDirty {
+			return m, cacheFlushTick()
+		}
 		return m, nil
 	case tea.QuitMsg:
 		m.flushCache()

main.go

@@ -13,7 +13,7 @@ import (
 func main() {
 	internal.InitData()
 	m := internal.NewModel()
-	p := tea.NewProgram(m, tea.WithFPS(5))
+	p := tea.NewProgram(m, tea.WithFPS(0))
 	if _, err := p.Run(); err != nil {
 		fmt.Fprintf(os.Stderr, "启动失败: %v\n", err)
 		os.Exit(1)