Jul 8 - Implement QR code per facility

app/templates/facilities/qr.html

@@ -0,0 +1,50 @@
+{% extends "base.html" %}
+{% block title %}QR Code — {{ facility.name }}{% endblock %}
+
+{% block content %}
+<style>
+    @media print {
+        .no-print { display: none !important; }
+        .navbar, nav, footer { display: none !important; }
+        .qr-card { border: none !important; box-shadow: none !important; }
+    }
+    .qr-card { max-width: 520px; margin: 0 auto; }
+</style>
+
+<div class="d-flex justify-content-between align-items-center mb-3 no-print">
+    <a href="{{ url_for('facilities.view_facility', facility_id=facility.id) }}"
+       class="btn btn-outline-secondary btn-sm">
+        <i class="bi bi-arrow-left"></i> Back to Facility
+    </a>
+    <button onclick="window.print()" class="btn btn-primary btn-sm">
+        <i class="bi bi-printer"></i> Print
+    </button>
+</div>
+
+<div class="card shadow-sm qr-card">
+    <div class="card-body text-center p-4">
+        <div class="text-muted text-uppercase small" style="letter-spacing:.08em;">
+            Scan for Facility Status
+        </div>
+        <h1 class="h3 fw-bold mt-1 mb-3">{{ facility.name }}</h1>
+
+        <img src="{{ url_for('facilities.facility_qr_png', facility_id=facility.id) }}"
+             alt="QR code for {{ facility.name }}"
+             style="width:260px;height:260px;max-width:100%;" class="mb-3">
+
+        <p class="mb-1">Scan this code with your phone camera to see this facility's
+           recent cleaning quality and to <strong>report a problem</strong>.</p>
+
+        {% if public_url %}
+        <div class="small text-muted mt-3">
+            Or visit:<br>
+            <a href="{{ public_url }}" class="text-break">{{ public_url }}</a>
+        </div>
+        {% endif %}
+    </div>
+</div>
+
+<p class="text-center text-muted small mt-3 no-print">
+    Tip: print this and post it at the facility entrance or in each restroom.
+</p>
+{% endblock %}