fix(phase26): server trip delete persists across recompute + batch delete with checkboxes

server/templates/history.html

@@ -14,8 +14,11 @@
     {# ── Trip list ──────────────────────────────────────────────────── #}
     <div class="col-12 col-xl-5">
         <div class="card shadow-sm">
-            <div class="card-header py-2">
+            <div class="card-header py-2 d-flex justify-content-between align-items-center">
                 <h6 class="text-primary fw-bold m-0">Recorded trips</h6>
+                <button id="delete-selected-btn" class="btn btn-sm btn-outline-danger" type="button" hidden title="Delete selected trips">
+                    <i class="fas fa-trash fa-fw"></i> Delete selected
+                </button>
             </div>
             <div class="card-body p-0">
                 <div id="trip-loading" class="text-center text-muted py-4">
@@ -38,6 +41,7 @@
                     true
                 ) }}
                 <script>document.getElementById('trip-list').dataset.deleteUrl = '/api/v1/portal/trip/';</script>
+                <script>document.getElementById('trip-list').dataset.batchDeleteUrl = '/api/v1/portal/trips/delete';</script>
             </div>
         </div>
     </div>