Add backup dashboard and appearance settings

backups_test.go

@@ -0,0 +1,15 @@
+package main
+
+import "testing"
+
+func TestLatestBackups(t *testing.T) {
+	items := []BackupItem{
+		{VMID: 100, CreatedAt: 10, Storage: "old"},
+		{VMID: 100, CreatedAt: 20, Storage: "new"},
+		{VMID: 101, CreatedAt: 15, Storage: "only"},
+	}
+	latest := latestBackups(items)
+	if len(latest) != 2 || latest[0].Storage != "new" {
+		t.Fatalf("неожиданный список последних копий: %+v", latest)
+	}
+}