chore: simplify workflows and unify tool logging and mail presentation

tools/preview/engine.go

@@ -5,6 +5,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"gitea-mail-templates/tools/logging"
 	"html/template"
 	"os"
 	"path/filepath"
@@ -259,15 +260,15 @@ func WriteRenderedJS(result *PreviewResult, output string) error {
 }
 
 func PrintDetailedSummary(result *PreviewResult, _ string, _ *config.TemplatesConfig) {
-	fmt.Printf("[PASS] %s: %d themes × %d mail types × %d languages\n", result.Upstream, len(result.Themes), len(result.Registry), len(result.Languages))
+	logging.Info("Preview", "%s: %d themes × %d mail types × %d languages", result.Upstream, len(result.Themes), len(result.Registry), len(result.Languages))
 	for _, lang := range result.Languages {
 		for _, warnings := range result.Warnings[lang] {
 			for _, warning := range warnings {
-				fmt.Println(warning)
+				logging.Warn("Upstream", "%s", strings.TrimPrefix(warning, "[UPSTREAM-WARN] "))
 			}
 		}
 		if keys := result.Fallback[lang]; len(keys) > 0 {
-			fmt.Printf("[FALLBACK] %s -> en-US: %s\n", lang, strings.Join(keys, ", "))
+			logging.Warn("Locale", "%s -> en-US: %s", lang, strings.Join(keys, ", "))
 		}
 	}
 }