feat: add custom sound upload and fix localization

internal/app/app.go

@@ -508,3 +508,105 @@ func (a *App) DownloadAndInstallUpdate() error {
 func (a *App) RestartApp() error {
 	return a.updater.RestartApp()
 }
+
+// Sound Management
+
+func (a *App) getSoundsDir() (string, error) {
+	configDir, err := os.UserConfigDir()
+	if err != nil {
+		return "", err
+	}
+	soundsDir := filepath.Join(configDir, "DailyTimer", "sounds")
+	if err := os.MkdirAll(soundsDir, 0755); err != nil {
+		return "", err
+	}
+	return soundsDir, nil
+}
+
+func (a *App) SelectCustomSound(soundType string) (string, error) {
+	// Validate sound type
+	validTypes := map[string]bool{"warning": true, "timeup": true, "meeting_end": true}
+	if !validTypes[soundType] {
+		return "", fmt.Errorf("invalid sound type: %s", soundType)
+	}
+
+	// Open file dialog
+	selection, err := runtime.OpenFileDialog(a.ctx, runtime.OpenDialogOptions{
+		Title: "Select Sound File",
+		Filters: []runtime.FileFilter{
+			{DisplayName: "Audio Files", Pattern: "*.mp3;*.wav;*.m4a;*.ogg"},
+		},
+	})
+	if err != nil {
+		return "", err
+	}
+	if selection == "" {
+		return "", nil // User cancelled
+	}
+
+	// Get sounds directory
+	soundsDir, err := a.getSoundsDir()
+	if err != nil {
+		return "", err
+	}
+
+	// Determine destination filename
+	ext := filepath.Ext(selection)
+	destPath := filepath.Join(soundsDir, soundType+ext)
+
+	// Copy file
+	src, err := os.Open(selection)
+	if err != nil {
+		return "", err
+	}
+	defer func() { _ = src.Close() }()
+
+	dst, err := os.Create(destPath)
+	if err != nil {
+		return "", err
+	}
+	defer func() { _ = dst.Close() }()
+
+	if _, err := dst.ReadFrom(src); err != nil {
+		return "", err
+	}
+
+	return destPath, nil
+}
+
+func (a *App) GetCustomSoundPath(soundType string) string {
+	soundsDir, err := a.getSoundsDir()
+	if err != nil {
+		return ""
+	}
+
+	// Check for common audio extensions
+	extensions := []string{".mp3", ".wav", ".m4a", ".ogg"}
+	for _, ext := range extensions {
+		path := filepath.Join(soundsDir, soundType+ext)
+		if _, err := os.Stat(path); err == nil {
+			return path
+		}
+	}
+
+	return ""
+}
+
+func (a *App) ClearCustomSound(soundType string) error {
+	soundsDir, err := a.getSoundsDir()
+	if err != nil {
+		return err
+	}
+
+	extensions := []string{".mp3", ".wav", ".m4a", ".ogg"}
+	for _, ext := range extensions {
+		path := filepath.Join(soundsDir, soundType+ext)
+		if _, err := os.Stat(path); err == nil {
+			if err := os.Remove(path); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}