Basic GUI client, login dialog, various comments fixes after copypaste.

client/internal/services/core/options/options.go

@@ -1,6 +1,7 @@
 package options
 
 import (
+	"errors"
 	"fmt"
 	"log/slog"
 
@@ -9,7 +10,11 @@ import (
 	"bunker/client/internal/services/core/options/models"
 )
 
-var _ = core.Options(&options{})
+var (
+	_ = core.Options(&options{})
+
+	errOptions = errors.New("options core service")
+)
 
 type options struct {
 	app        *application.Application
@@ -18,17 +23,17 @@ type options struct {
 	mainWindow core.MainWindow
 
 	widgets      map[string]*models.OptionPane
-	widgetsItems []string // для рисования списка Fyne.
+	widgetsItems []string // for Fyne's list widget.
 }
 
-// Initialize инициализирует сервис.
+// Initialize initializes service.
 func Initialize(app *application.Application) error {
 	opts := &options{
 		app: app,
 	}
 
 	if err := app.RegisterService(opts); err != nil {
-		return fmt.Errorf("%w: %w", core.ErrOptions, err)
+		return fmt.Errorf("%w: %w", &errOptions, err)
 	}
 
 	return nil