refactor(tui): 重构 UI 设计

- 将 UI 组件分解为更小的模块，提高可维护性
- 优化了列表渲染和路径输入逻辑
- 改进了帮助界面的显示方式
- 调整了 UI 样式，去除了冗余代码

node/utils_test.go

@@ -0,0 +1,57 @@
+package node
+
+import (
+	"fmt"
+	"testing"
+)
+
+// 测试 BytesToHumanReadable 函数
+func TestBytesToHumanReadable(t *testing.T) {
+	tests := []struct {
+		num    float64
+		suffix string
+		want   string
+	}{
+		{1024, "B", "1.0 KiB"},
+		{1024 * 1024, "B", "1.0 MiB"},
+		{1024 * 1024 * 1024, "B", "1.0 GiB"},
+		{1024 * 1024 * 1024 * 1024, "B", "1.0 TiB"},
+		{1024 * 1024 * 1024 * 1024 * 1024, "B", "1.0 PiB"},
+		{1024 * 1024 * 1024 * 1024 * 1024 * 1024, "B", "1.0 EiB"},
+		{1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024, "B", "1.0 ZiB"},
+		{1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024 * 1024, "B", "1.0 YiB"},
+		{512, "B", "512.0 B"},
+	}
+
+	for _, tt := range tests {
+		t.Run(fmt.Sprintf("%f_%s", tt.num, tt.suffix), func(t *testing.T) {
+			got := BytesToHumanReadable(tt.num, tt.suffix)
+			if got != tt.want {
+				t.Errorf("BytesToHumanReadable(%f, %s) = %s; want %s", tt.num, tt.suffix, got, tt.want)
+			}
+		})
+	}
+}
+
+// 测试 FormatSize 函数
+func TestFormatSize(t *testing.T) {
+	tests := []struct {
+		size int64
+		want string
+	}{
+		{1024, "   1.0 KiB"},
+		{1024 * 1024, "   1.0 MiB"},
+		{1024 * 1024 * 1024, "   1.0 GiB"},
+		{1024 * 1024 * 1024 * 1024, "   1.0 TiB"},
+		{512, "   512.0 B"},
+	}
+
+	for _, tt := range tests {
+		t.Run(fmt.Sprintf("%d", tt.size), func(t *testing.T) {
+			got := FormatSize(tt.size)
+			if got != tt.want {
+				t.Errorf("FormatSize(%d) = %s; want %s", tt.size, got, tt.want)
+			}
+		})
+	}
+}