render method
Implementation
@override
void render(Rect area, Buffer buffer, RenderContext ctx) {
if (area.isEmpty) return;
final s = style ?? Style(fg: ctx.theme.colors.primary);
final effectiveKey =
tickerKey ?? Key.composite([#__spinner, area.x, area.y]);
final entry = ctx.async_.useStream<int>(
effectiveKey,
() => _ticker(interval),
);
final tick = entry.value ?? frame;
final ch = frames[tick % frames.length];
final text = label != null ? '$ch $label' : ch;
buffer.writeText(area.x, area.y, text, style: s, maxWidth: area.width);
}