Changed:
[Edit.cshtml (line 29)](C:/Source/PlotLine/PlotLine/Views/FloorPlans/Edit.cshtml:29): added Sliding Door, French Door, and Ladder marker mappings/SVGs.
[Edit.cshtml (line 1729)](C:/Source/PlotLine/PlotLine/Views/FloorPlans/Edit.cshtml:1729): Ladder To Location filtering now lists placed locations on floors above, sorted by level/floor/name with clean labels like First Floor > East Hallway 1st.
[Edit.cshtml (line 2072)](C:/Source/PlotLine/PlotLine/Views/FloorPlans/Edit.cshtml:2072): Ladder renders inside the From Location using the existing position system.
[CoreServices.cs (line 7966)](C:/Source/PlotLine/PlotLine/Services/CoreServices.cs:7966): server validation now treats Ladder as a vertical upward transition, without stairs reciprocity.
[CoreModels.cs (line 1243)](C:/Source/PlotLine/PlotLine/Models/CoreModels.cs:1243): normalisation accepts Ladders.
[site.css (line 4902)](C:/Source/PlotLine/PlotLine/wwwroot/css/site.css:4902) and minified CSS: added light/dark styling for the new marker types.
No database changes. No new tables. No Features, architecture, AJAX, or secret/hidden room logic changes.
Changed:
[Edit.cshtml (line 36)](C:/Source/PlotLine/PlotLine/Views/FloorPlans/Edit.cshtml:36)Secret Passage and Hidden Passage now render as dashed route overlays instead of wall markers.
Hidden Door remains a wall/shared-edge marker and follows existing adjacency rules.
Hidden locations are detected from existing transition data: visible entrances count, windows/hidden doors/secret passages/hidden passages/blocked doors do not.
Hidden room tooltip now includes Hidden location: no visible entrance.
[site.css (line 4793)](C:/Source/PlotLine/PlotLine/wwwroot/css/site.css:4793)Added subtle hidden-location hatch styling.
Added dashed secret-route styling with dark-theme support.
[site.min.css](C:/Source/PlotLine/PlotLine/wwwroot/css/site.min.css)Synced minified CSS.
No database changes. No stored procedure changes. No Features concept added.
