fix mm^2 issue

templates/projected-area-results.html

@@ -11,13 +11,13 @@
     <table style="background: #f1f1f1">
         <tr>
             <th class="legend-heading">Index</th>
-            <th class="legend-heading">Area</th>
+            <th class="legend-heading">Area (mm²)</th>
             <th class="legend-heading">Copy</th>
         </tr>
         {% for item in dtable %}
         <tr>
             <td class="legend-cell">{{ item.0 }}</td>
-            <td class="legend-cell">{{ item.1 }} mm²</td>
+            <td class="legend-cell">{{ item.1 }}</td>
             <td>
                 <button onclick="() => navigator.clipboard.writeText('{{ item.1 }}')">Copy</button>
             </td>