feat: 지정판매소 판매대장 크기(리터)별 품목 필터

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Views/admin/sales_report/sales_ledger.php

@@ -115,6 +115,15 @@ $excelUrl = mgmt_url('reports/sales-ledger?' . http_build_query($exportParams));
             <?= esc($catLabels[$ck] ?? $ck) ?>
           </label>
         <?php endforeach; ?>
+        <span class="inline-flex items-center gap-1 ml-2 pl-3 border-l border-gray-200">
+          <span class="text-xs text-gray-600">크기</span>
+          <select name="size" class="border border-gray-300 rounded px-2 py-1 text-sm">
+            <option value="">전체</option>
+            <?php foreach (($sizeOptions ?? []) as $sz): ?>
+            <option value="<?= esc($sz, 'attr') ?>" <?= ($size ?? '') === $sz ? 'selected' : '' ?>><?= esc($sz) ?></option>
+            <?php endforeach; ?>
+          </select>
+        </span>
       </div>
     </fieldset>
     <div>