feat: add sum row to award details table

Add a summary row at the bottom of the award details table that shows the sum for each band column. The sum automatically calculates:
- For points-based awards: Total confirmed points per band
- For QSO-based awards: Count of confirmed QSOs per band

The sum row is styled with a gray background and bold text for visual distinction.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/frontend/src/routes/awards/[id]/+page.svelte

@@ -164,6 +164,28 @@
     applyFilter();
   }
 
+  // Calculate band sums
+  $: bandSums = (() => {
+    const sums = new Map();
+    const hasPoints = entities.length > 0 && entities[0].points !== undefined;
+
+    bands.forEach(band => {
+      if (hasPoints) {
+        // Sum points for confirmed QSOs in this band
+        const sum = entities
+          .filter(e => e.band === band && e.confirmed)
+          .reduce((total, e) => total + (e.points || 0), 0);
+        sums.set(band, sum);
+      } else {
+        // Count confirmed QSOs in this band
+        const count = entities.filter(e => e.band === band && e.confirmed).length;
+        sums.set(band, count);
+      }
+    });
+
+    return sums;
+  })();
+
   // QSO Detail Modal Functions
   async function openQSODetailModal(qso) {
     loadingQSO = true;
@@ -341,6 +363,19 @@
               </tr>
             {/each}
           </tbody>
+          <tfoot>
+            <tr class="sum-row">
+              <td class="sum-label">
+                <strong>Sum</strong>
+              </td>
+              {#each bands as band}
+                {@const sum = bandSums.get(band) ?? 0}
+                <td class="sum-cell">
+                  <strong>{sum}</strong>
+                </td>
+              {/each}
+            </tr>
+          </tfoot>
         </table>
       {/if}
     </div>
@@ -559,6 +594,28 @@
     padding: 0px 3px 0px 3px;
 }
 
+   .award-table tfoot {
+    background-color: #f5f5f5;
+    border-top: 2px solid #333;
+   }
+
+   .sum-row td {
+    border: 1px solid #000;
+    padding: 8px 5px;
+    text-align: center;
+    background-color: #f5f5f5;
+    font-weight: 600;
+   }
+
+   .sum-label {
+    text-align: left !important;
+    color: #333;
+   }
+
+   .sum-cell {
+    color: #4a90e2;
+   }
+
   .award-header {
     margin-bottom: 2rem;
   }