window size saved to config, smaller font in track-list

backend/config/window.go

@@ -0,0 +1,33 @@
+package config
+
+const (
+	// DefaultWidth is the default window width in pixels.
+	DefaultWidth = 512
+	// DefaultHeight is the default window height in pixels.
+	DefaultHeight = 384
+)
+
+// WindowConfig holds window size preferences.
+type WindowConfig struct {
+	Width  int `toml:"Width"`
+	Height int `toml:"Height"`
+}
+
+// NewDefaultWindowConfig returns a WindowConfig with sensible defaults.
+func NewDefaultWindowConfig() *WindowConfig {
+	return &WindowConfig{
+		Width:  DefaultWidth,
+		Height: DefaultHeight,
+	}
+}
+
+// applyDefaults fills in zero-value fields with defaults.
+func (w *WindowConfig) applyDefaults() {
+	if w.Width <= 0 {
+		w.Width = DefaultWidth
+	}
+
+	if w.Height <= 0 {
+		w.Height = DefaultHeight
+	}
+}