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

backend/app.go

@@ -107,6 +107,11 @@ func NewYellowJacketApp(
 	return yjApp, nil
 }
 
+// WindowConfig returns the window configuration for use by the host.
+func (yj *YellowJacketApp) WindowConfig() *config.WindowConfig {
+	return yj.appConfig.Window
+}
+
 var startupErr error
 
 // OnStartup initializes components that require the Wails runtime context.
@@ -143,6 +148,23 @@ func (yj *YellowJacketApp) OnStartup(ctx context.Context) {
 	yj.FEBindings = append(yj.FEBindings, yj.player)
 }
 
+// OnBeforeClose captures window state while the window is still alive.
+func (yj *YellowJacketApp) OnBeforeClose(ctx context.Context) bool {
+	w, h := wailsruntime.WindowGetSize(ctx)
+
+	yj.appConfig.Window.Width = w
+	yj.appConfig.Window.Height = h
+
+	if err := yj.appConfig.Save(); err != nil {
+		yj.logger.Error(
+			"Failed to save window state",
+			"err", err,
+		)
+	}
+
+	return false
+}
+
 // OnShutdown saves player state and cleans up resources before the application exits.
 func (yj *YellowJacketApp) OnShutdown(_ context.Context) {
 	if yj.player != nil {

backend/config/config.go

@@ -23,6 +23,8 @@ type Config struct {
 	serveMux *http.ServeMux
 	filePath string          // required
 	Library  *library.Config `form:"Library" schema:"library,required"`
+
+	Window *WindowConfig `toml:"Window"`
 }
 
 // NewConfig creates a new config by loading it from disk.
@@ -36,6 +38,7 @@ func NewConfig(logger *slog.Logger) (*Config, error) {
 		filePath: path.Join(confDir, "config.toml"),
 		serveMux: http.NewServeMux(),
 	}
+	conf.applyDefaults()
 	conf.logger = logger.WithGroup("config").With("config", conf)
 	conf.serveMux.HandleFunc("/", conf.handle)
 
@@ -99,6 +102,8 @@ func (c *Config) Load() error {
 		return fmt.Errorf("problem parsing config file %s: %w", c.filePath, err)
 	}
 
+	c.applyDefaults()
+
 	// validate the config
 	if err = c.Validate(); err != nil {
 		return fmt.Errorf("invalid config file at %s: %w", c.filePath, err)
@@ -130,6 +135,15 @@ func (c *Config) Save() error {
 	return nil
 }
 
+// applyDefaults ensures all config sections have valid defaults.
+func (c *Config) applyDefaults() {
+	if c.Window == nil {
+		c.Window = NewDefaultWindowConfig()
+	} else {
+		c.Window.applyDefaults()
+	}
+}
+
 // SetContext sets the Wails runtime context for event emission.
 func (c *Config) SetContext(ctx context.Context) {
 	c.ctx = ctx

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
+	}
+}