feat: sync rich text message support

internal/compat/tdesktop/defaults.go

@@ -7,7 +7,7 @@ import (
 )
 
 const (
-	appConfigHash     = 14 // app config 内容变更时必须递增，否则缓存端只会收到 notModified。
+	appConfigHash     = 15 // app config 内容变更时必须递增，否则缓存端只会收到 notModified。
 	countriesListHash = 1
 	timezonesListHash = 1
 )
@@ -40,6 +40,8 @@ func readMarkAppConfig(mapboxToken string) *tg.JSONObject {
 		{Key: "reactions_user_max_premium", Value: &tg.JSONNumber{Value: 3}},
 		// DrKLO 频道自定义 reaction 编辑页用它作为可选 reaction 数量上限。
 		{Key: "boosts_channel_level_max", Value: &tg.JSONNumber{Value: 100}},
+		// TDesktop 富文本编辑入口：官方默认缺省 disabled，显式 enabled 才显示/允许进入编辑器。
+		{Key: "rich_message_posting", Value: &tg.JSONString{Value: "enabled"}},
 		// dialog_filters_enabled=true：TDesktop 据此(或已有文件夹)才显示 Settings→Folders 入口。
 		{Key: "dialog_filters_enabled", Value: &tg.JSONBool{Value: true}},
 		{Key: "stories_stealth_future_period", Value: &tg.JSONNumber{Value: 1500}},

internal/compat/tdesktop/startup_stubs_test.go

@@ -39,11 +39,15 @@ func TestAppConfigIncludesStoryStealthPeriods(t *testing.T) {
 		t.Fatalf("AppConfig(0) = %#v, want modified config with hash", got)
 	}
 	values := make(map[string]float64)
+	strings := make(map[string]string)
 	if object, ok := got.Config.(*tg.JSONObject); ok && object != nil {
 		for _, entry := range object.Value {
 			if number, ok := entry.Value.(*tg.JSONNumber); ok {
 				values[entry.Key] = number.Value
 			}
+			if str, ok := entry.Value.(*tg.JSONString); ok {
+				strings[entry.Key] = str.Value
+			}
 		}
 	}
 	want := map[string]float64{
@@ -56,6 +60,9 @@ func TestAppConfigIncludesStoryStealthPeriods(t *testing.T) {
 			t.Fatalf("AppConfig[%q] = %v, want %v", key, values[key], expected)
 		}
 	}
+	if strings["rich_message_posting"] != "enabled" {
+		t.Fatalf("AppConfig[rich_message_posting] = %q, want enabled", strings["rich_message_posting"])
+	}
 	if _, ok := AppConfig(got.Hash).(*tg.HelpAppConfigNotModified); !ok {
 		t.Fatalf("AppConfig(hash) = %#v, want notModified", AppConfig(got.Hash))
 	}