Jul 7 - Implement QR codes for facility

app/utils/qr.py

@@ -0,0 +1,24 @@
+"""
+app/utils/qr.py
+---------------
+Generic QR-code SVG helper (phase38).
+
+Mirrors qr_svg() in app/utils/mfa.py (which is TOTP-specific and mirrored in
+control/mfa.py — do not touch those; this is the general-purpose variant for
+facility QR codes and any future QR needs).
+"""
+
+import io
+import qrcode
+import qrcode.image.svg
+
+
+def qr_svg(data: str) -> str:
+    """Return an inline SVG string encoding `data` (no Pillow needed).
+
+    The SVG carries its own width/height attrs; size it via CSS on the
+    containing element (svg { width:…; height:…; }) when embedding.
+    """
+    buf = io.BytesIO()
+    qrcode.make(data, image_factory=qrcode.image.svg.SvgPathImage).save(buf)
+    return buf.getvalue().decode('utf-8')