Implemented the focused Floor Plans refinement pass.
Changed:
[Edit.cshtml (line 172)](C:/Source/PlotLine/PlotLine/Views/FloorPlans/Edit.cshtml:172)Added optional grid coordinate toggle with localStorage persistence.
Added adjacent-floor ghost/reference overlay selector.
Added overlap-aware Stairs Up/Down target filtering.
Added explicit fallback button: “Show all locations on floor above/below”.
Kept door/window same-floor adjacency filtering and Hidden/Open/Secret Passage unrestricted behaviour.
[site.css (line 4534)](C:/Source/PlotLine/PlotLine/wwwroot/css/site.css:4534)Added subtle coordinate labels, ghost floor blocks, warning styling, and dark-theme support.
[site.min.css](C:/Source/PlotLine/PlotLine/wwwroot/css/site.min.css)Synced minified CSS.
Database changes: none.
Stored procedures modified: none.
No Features, no transition redesign, no schema changes.
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