dev: add deterministic demo dataset

backend/app/frontend/views.py

@@ -142,6 +142,9 @@ def _map_content(can_manage_locations: bool = False) -> str:
 <section class="mine-map-workspace" id="mapWorkspace" hidden>
     <div class="map-main-column">
         <div id="mapLegend" class="map-legend" aria-label="Map legend"></div>
+        <p id="mapPermissionNote" class="map-notice" hidden>
+            Miner details require inventory access. Layout and occupancy remain visible.
+        </p>
         <div id="mapNotice" class="map-notice" role="status" hidden></div>
         <div id="mapViewport" class="map-viewport-v1"
             aria-label="Room racks, shelves, and positions"></div>