/**
 * Minimalni QR code generator pro TOTP URI.
 * Generuje QR client-side pres Canvas - zadny externi API call.
 * Pouziva qrcode npm package (nutno nainstalovat).
 *
 * Fallback: pokud canvas neni k dispozici, nic se nevykresli.
 */
import QRCode from 'qrcode'

export async function renderQR(canvas, data) {
  try {
    await QRCode.toCanvas(canvas, data, {
      width: 200,
      margin: 2,
      color: {
        dark: '#000000',
        light: '#ffffff'
      }
    })
  } catch {
    // QR render failed silently
  }
}