Add emoji favicon (📁) for browser tab

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

portal/templates/portal/base.html

@@ -8,6 +8,7 @@
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
     <link rel="manifest" href="/manifest.json">
     {% load static %}
+    <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>📁</text></svg>">
     <link rel="apple-touch-icon" href="{% static 'portal/icon-192.png' %}">
     <title>{% block title %}Upload{% endblock %} - rfiles.online</title>
     <style>