fix(history): 历史条目不再显示裸 URL

浏览器没给标题（或标题本身就是 URL）时，改为显示去掉 www. 的域名，
例如 https://www.docker.com/ -> docker.com。

history-server/main.go

@@ -217,7 +217,9 @@ func handleStats(w http.ResponseWriter, r *http.Request) {
 		total += e.TotalVisits
 	}
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(map[string]any{"unique_urls": len(history), "total_visits": total})
+	if err := json.NewEncoder(w).Encode(map[string]any{"unique_urls": len(history), "total_visits": total}); err != nil {
+		log.Printf("stats response: %v", err)
+	}
 }
 
 func normalizeURL(raw string) (string, error) {
@@ -485,10 +487,7 @@ func rebuildDashySections() {
 			if navHosts[strings.ToLower(hostOf(e.URL))] {
 				continue // 已是导航项，不重复进历史
 			}
-			title := e.Title
-			if title == "" {
-				title = e.URL
-			}
+			title := friendlyHistoryTitle(e.Title, e.URL)
 			icon := "fas fa-globe"
 			if hp := hostPortOf(e.URL); hp != "" {
 				if name := cachedFavicon(hp); name != "" {
@@ -525,6 +524,26 @@ func rebuildDashySections() {
 	os.Rename(tmp, confFile)
 }
 
+// friendlyHistoryTitle 避免把历史项标题直接显示成长 URL。
+// 浏览器不给标题、或标题本身就是 URL 时，改用去掉 www. 的简洁域名。
+func friendlyHistoryTitle(title, rawURL string) string {
+	clean := strings.TrimSpace(title)
+	low := strings.ToLower(clean)
+	if clean != "" && !strings.HasPrefix(low, "http://") && !strings.HasPrefix(low, "https://") {
+		return clean
+	}
+	if u, err := url.Parse(rawURL); err == nil {
+		host := strings.TrimPrefix(strings.ToLower(u.Hostname()), "www.")
+		if host != "" {
+			return host
+		}
+	}
+	if clean != "" {
+		return clean
+	}
+	return "历史站点"
+}
+
 func hostOf(rawURL string) string {
 	if u, err := url.Parse(rawURL); err == nil {
 		return strings.ToLower(u.Hostname())

history-server/main_test.go

@@ -0,0 +1,22 @@
+package main
+
+import "testing"
+
+func TestFriendlyHistoryTitle(t *testing.T) {
+	cases := []struct {
+		name, title, rawURL, want string
+	}{
+		{name: "real title", title: "Docker Documentation", rawURL: "https://www.docker.com/docs/", want: "Docker Documentation"},
+		{name: "missing title", rawURL: "https://www.docker.com/", want: "docker.com"},
+		{name: "url title", title: "https://www.docker.com/", rawURL: "https://www.docker.com/", want: "docker.com"},
+		{name: "http url title", title: "http://example.org/a", rawURL: "http://example.org/a", want: "example.org"},
+		{name: "invalid fallback", rawURL: "://", want: "历史站点"},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := friendlyHistoryTitle(tc.title, tc.rawURL); got != tc.want {
+				t.Fatalf("friendlyHistoryTitle(%q, %q) = %q; want %q", tc.title, tc.rawURL, got, tc.want)
+			}
+		})
+	}
+}