refactor(template): delegate handler-level RenderError to helpers package

- Moved core RenderError logic to internal/helpers/template/error.go
- Added thin wrapper method in internal/handlers/template/error.go
- Simplified function signature (no config args, uses InitSiteMeta)
- Preserved architecture: handlers own HTTP layer, helpers supply logic

internal/handlers/template/error.go

@@ -13,51 +13,13 @@ package handlers
 //Handlers	Own an HTTP concern — e.g. routes, rendering responses, returning templates or JSON.	Injected dependencies (cfg, db, etc.). Should use helpers, not vice versa.
 
 import (
-	"fmt"
-	"log"
 	"net/http"
-	"os"
 
 	templateHelpers "synlotto-website/internal/helpers/template"
-
-	"synlotto-website/internal/models"
 )
 
-func RenderError(
-	w http.ResponseWriter,
-	r *http.Request,
-	statusCode int,
-	siteName string,
-	copyrightYearStart int,
-) {
-	log.Printf("⚙️ RenderError called with status: %d", statusCode)
-
-	context := templateHelpers.TemplateContext(
-		w, r,
-		models.TemplateData{},
-		siteName,
-		copyrightYearStart,
-	)
-
-	pagePath := fmt.Sprintf("templates/error/%d.html", statusCode)
-	log.Printf("📄 Checking for template file: %s", pagePath)
-
-	if _, err := os.Stat(pagePath); err != nil {
-		log.Printf("🚫 Template file missing: %s", err)
-		http.Error(w, http.StatusText(statusCode), statusCode)
-		return
-	}
-
-	log.Println("✅ Template file found, loading...")
-
-	tmpl := templateHelpers.LoadTemplateFiles(fmt.Sprintf("%d.html", statusCode), pagePath)
-
-	w.WriteHeader(statusCode)
-	if err := tmpl.ExecuteTemplate(w, "layout", context); err != nil {
-		log.Printf("❌ Failed to render error page layout: %v", err)
-		http.Error(w, http.StatusText(statusCode), statusCode)
-		return
-	}
-
-	log.Println("✅ Successfully rendered error page") // ToDo: log these to db
+// RenderError delegates to the helper's RenderError, ensuring handlers remain
+// the entry point for rendering HTTP responses.
+func (h *Handler) RenderError(w http.ResponseWriter, r *http.Request, statusCode int) {
+	templateHelpers.RenderError(w, r, statusCode)
 }

internal/helpers/template/error.go

@@ -0,0 +1,38 @@
+package helpers
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+
+	"synlotto-website/internal/models"
+)
+
+// RenderError renders an HTML error page (e.g., 404.html, 500.html).
+// It uses TemplateContext which reads site meta from InitSiteMeta().
+func RenderError(w http.ResponseWriter, r *http.Request, statusCode int) {
+	log.Printf("⚙️ RenderError called with status: %d", statusCode)
+
+	ctx := TemplateContext(w, r, models.TemplateData{})
+
+	pagePath := fmt.Sprintf("templates/error/%d.html", statusCode)
+	log.Printf("📄 Checking for template file: %s", pagePath)
+
+	if _, err := os.Stat(pagePath); err != nil {
+		log.Printf("🚫 Template file missing: %s", err)
+		http.Error(w, http.StatusText(statusCode), statusCode)
+		return
+	}
+
+	tmpl := LoadTemplateFiles(fmt.Sprintf("%d.html", statusCode), pagePath)
+
+	w.WriteHeader(statusCode)
+	if err := tmpl.ExecuteTemplate(w, "layout", ctx); err != nil {
+		log.Printf("❌ Failed to render error page layout: %v", err)
+		http.Error(w, http.StatusText(statusCode), statusCode)
+		return
+	}
+
+	log.Println("✅ Successfully rendered error page")
+}