Legend panel display, toggle all controls, visibility, fullscreen, shortcuts, style classes, and WMS legend images.
Test plan: 07-legend.md
Two GeoCore layers with group structure (Fieldnotes = many ESRI groups, Hydro = many WMS groups) + a simple layer + ESRI Feature layers with uniqueValue and classBreaks style classes for style toggle tests. Legend in app bar (fullscreen button available). Layers tab in footer bar for legend → layers shortcut test.
Multiple WMS layers. Expand each in the legend to see legend images. Click an image to open the lightbox.