Add logbook entries, data export page, and JSON import

templates/base.html

@@ -334,6 +334,20 @@
 
     {% block content %}{% endblock %}
   </div>
+
+  <footer style="text-align:center;padding:1.25rem 1rem 1.5rem;margin-top:1rem;
+                  border-top:1px solid var(--border);font-size:0.8rem;">
+    <a href="{{ url_for('export_page') }}"
+       style="color:var(--text-muted);text-decoration:none;"
+       onmouseover="this.style.textDecoration='underline'"
+       onmouseout="this.style.textDecoration='none'">Export data</a>
+    <span style="color:var(--text-muted);margin:0 0.5rem;">·</span>
+    <a href="{{ url_for('import_page') }}"
+       style="color:var(--text-muted);text-decoration:none;"
+       onmouseover="this.style.textDecoration='underline'"
+       onmouseout="this.style.textDecoration='none'">Import data</a>
+  </footer>
+
   <div id="confirm-modal" role="dialog" aria-modal="true">
     <div id="confirm-modal-box">
       <p id="confirm-modal-msg"></p>