major styling pass, artist list, and import processing improvements

app/templates/index.html

@@ -1,8 +1,14 @@
 {% extends "layout.html" %}
-
-{% block title %}Home{% endblock %}
+{% block title %}Welcome{% endblock %}
 
 {% block content %}
-<h1>Welcome to the Flask Template App!</h1>
-<p>This is the index page.</p>
+<div class="index-hero" style="background-image: url('{{ background_url }}');">
+  <div class="index-overlay">
+    <div class="index-message">
+      <h1>Private Image Repository</h1>
+      <p>This is a private image collection. You must register for access to browse and contribute.</p>
+      <a href="{{ url_for('auth.register') }}" class="btn primary-btn">Register</a>
+    </div>
+  </div>
+</div>
 {% endblock %}