Initial commit

src/utils/qrcode.js

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+/**
+ * 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
+  }
+}