The panel had one distance for the view edges, the widgets it steps around,
and the selection alike, so it stood eight pixels from a building and touched
it outright along the top. The gap from the selection is now its own value,
half a tile, and it is horizontal only -- the top edges stay level.
It is sampled where the tile size is known, in the same moment as the anchor
rectangle, and travels with it: a rectangle frozen in one moment has no
meaningful distance to a tile size measured in another. chooseSide now takes
the gap in place of the margin, the band having already taken the margin off.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ne3mejABZoLWKLh8fgpM3x
