Cross-feature interactions between projection switches and geometry, data tables, north pole, extent, and vector tiles.
Test plan: 13-projection.md
Draw geometry, open data table, then switch projection. Verify geometry reprojects and table survives.
Max extent [-180, 0, 100, 80]. Verify constraint applies after switching to LCC and back to WM.
Switch projection to LCC — vector tile should show incompatibility warning.