chore: client default size & dark theme backgroud

client/client.go

@@ -192,6 +192,9 @@ func (e *client) BuildUI(w fyne.Window) {
 }
 
 func (e *client) loadWorld(w *world.World) {
+	if w == nil {
+		return
+	}
 	w.SetCircleRadiusScaleFp(world.SCALE / 4)
 	e.world = w
 	// TODO: store camera position in user settings
@@ -218,9 +221,11 @@ func (e *client) loadWorld(w *world.World) {
 
 func (e *client) Run() error {
 	e.BuildUI(e.window)
-	e.window.SetMaster()
 	e.startBackground()
 	e.RequestRefresh()
+	e.window.SetMaster()
+	e.window.Resize(fyne.NewSize(800, 600))
+	e.window.CenterOnScreen()
 	e.window.ShowAndRun()
 	e.stopBackground()
 	return nil

client/world/theme_default.go

@@ -189,8 +189,9 @@ func (*DarkTheme) Name() string { return "Dark (Soft + Texture)" }
 
 func (*DarkTheme) BackgroundColor() color.Color { return cRGBA(30, 32, 38, 255) } // #1E2026
 func (t *DarkTheme) BackgroundImage() image.Image {
+	return nil
 	// This image is immutable after creation.
-	return t.bg
+	// return t.bg
 }
 
 func (*DarkTheme) BackgroundTileMode() BackgroundTileMode     { return BackgroundTileRepeat }