feat: you can summary screen shot directly

internal/infrastructure/config/file_store.go

@@ -1,12 +1,12 @@
 // Package config provides JSON-file backed persistence for AppConfig.
 //
 // Design rationale:
-// - JSON keeps the file human-readable, which is useful while the MVP has
-//   no settings UI for every option.
-// - Storage location follows os.UserConfigDir() so each platform places it
-//   in the canonical spot (macOS: ~/Library/Application Support/SnapGo).
-// - File mode 0600 / dir mode 0700 mitigate accidental leakage of access
-//   keys before we wire up the OS keychain (deferred to a later spec).
+//   - JSON keeps the file human-readable, which is useful while the MVP has
+//     no settings UI for every option.
+//   - Storage location follows os.UserConfigDir() so each platform places it
+//     in the canonical spot (macOS: ~/Library/Application Support/SnapGo).
+//   - File mode 0600 / dir mode 0700 mitigate accidental leakage of access
+//     keys before we wire up the OS keychain (deferred to a later spec).
 package config
 
 import (
@@ -65,6 +65,7 @@ func (s *FileStore) Load() (domain.AppConfig, error) {
 	if err := json.Unmarshal(data, &cfg); err != nil {
 		return domain.DefaultAppConfig(), fmt.Errorf("parse config: %w", err)
 	}
+	cfg.Normalize()
 	return cfg, nil
 }
 
@@ -74,6 +75,7 @@ func (s *FileStore) Save(cfg domain.AppConfig) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
+	cfg.Normalize()
 	data, err := json.MarshalIndent(cfg, "", "  ")
 	if err != nil {
 		return fmt.Errorf("marshal config: %w", err)