feat(daemon-beta t26): 托盤選單顯連線身分（暱稱>email>未設定），CF 全程隱形

- directConfig/DirectConfig 加 Email、InstanceName（選配）欄，兩結構同形
- rebuildTray 選單頂加 disabled「連線中：<暱稱||email||未設定>」列；
  有 cypher_url 再加一行縮短 host（fyne MenuItem 無 tooltip，取捨見註解）
- connectionStatusLabel/shortCypherHost 抽純函式，3+3 案 table test
- go vet + go test 全綠（collector 43 通、tray 10 通）；tray go build 過

cmd/arcrun-tray/main_test.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+// t26：暱稱 > email > 未設定（leo 07-24 拍板：CF 全程隱形，這條邏輯不該提到 cypher/CF）。
+func TestConnectionStatusLabel(t *testing.T) {
+	cases := []struct {
+		name         string
+		instanceName string
+		email        string
+		want         string
+	}{
+		{"暱稱優先於email", "我的書房", "leo21c@gmail.com", "連線中：我的書房"},
+		{"無暱稱退回email", "", "leo21c@gmail.com", "連線中：leo21c@gmail.com"},
+		{"兩者皆空顯示未設定", "", "", "連線中：未設定"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			got := connectionStatusLabel(c.instanceName, c.email)
+			if got != c.want {
+				t.Errorf("connectionStatusLabel(%q, %q) = %q, want %q", c.instanceName, c.email, got, c.want)
+			}
+		})
+	}
+}
+
+func TestShortCypherHost(t *testing.T) {
+	cases := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"完整URL取host", "https://arcrun-cypher-executor.someacct.workers.dev/path", "arcrun-cypher-executor.someacct.workers.dev"},
+		{"空字串回空字串", "", ""},
+		{"無法解析出host則原樣回傳", "not-a-url", "not-a-url"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			got := shortCypherHost(c.in)
+			if got != c.want {
+				t.Errorf("shortCypherHost(%q) = %q, want %q", c.in, got, c.want)
+			}
+		})
+	}
+}
+
+// config 序列化含新欄（email／instance_name）——t26 施工面一驗收項。
+func TestDirectConfigJSONRoundTrip(t *testing.T) {
+	c := &directConfig{
+		CypherURL:    "https://example.workers.dev",
+		Namespace:    "demo",
+		Email:        "leo21c@gmail.com",
+		InstanceName: "我的書房",
+	}
+	data, err := json.Marshal(c)
+	if err != nil {
+		t.Fatalf("marshal 失敗：%v", err)
+	}
+	s := string(data)
+	if !strings.Contains(s, `"email":"leo21c@gmail.com"`) {
+		t.Errorf("序列化結果缺 email 欄：%s", s)
+	}
+	if !strings.Contains(s, `"instance_name":"我的書房"`) {
+		t.Errorf("序列化結果缺 instance_name 欄：%s", s)
+	}
+
+	var back directConfig
+	if err := json.Unmarshal(data, &back); err != nil {
+		t.Fatalf("unmarshal 失敗：%v", err)
+	}
+	if back.Email != c.Email || back.InstanceName != c.InstanceName {
+		t.Errorf("round-trip 不一致：got email=%q instance_name=%q", back.Email, back.InstanceName)
+	}
+}
+
+// 暱稱空時 config JSON 不應寫出 instance_name 欄（omitempty；對齊面二 installer 端「空就不寫欄位」的約定）。
+func TestDirectConfigJSONOmitsEmptyInstanceName(t *testing.T) {
+	c := &directConfig{
+		CypherURL: "https://example.workers.dev",
+		Namespace: "demo",
+		Email:     "leo21c@gmail.com",
+	}
+	data, err := json.Marshal(c)
+	if err != nil {
+		t.Fatalf("marshal 失敗：%v", err)
+	}
+	if strings.Contains(string(data), "instance_name") {
+		t.Errorf("暱稱空時不該序列化出 instance_name 欄：%s", data)
+	}
+}