tweak: example cards fill the row as 3 equal columns

tweak: nicer upload icon and refined footnote (SIGSPATIAL 2025, CMU)

feat: intro page, undo/redo, transition fix, naming and stats polish

feat: stable view on pruning toggle, stage-aware stats, route stats panel

tweak: default room/door/outside node size to 15

fix: use matplotlib.colormaps instead of removed cm.get_cmap

feat: room/exit/isolated connectivity, real-time route breaks, broken highlight

feat: hover-select glow, persistent route endpoints, live connectivity

feat: graph-editor UX overhaul and headless matplotlib fix

feat: interactive A*/Dijkstra navigation in the graph viewer

Deploy: floorplan rendered as DOM element, edges always visible