Replace single-tile tree rendering with 6 multi-tile tree variants using
the treesnstone.png tileset. Each tree is 3 tiles wide with canopy tiles
on the decorations layer (above characters) and ground/shadow tiles on
the trunkDecorations layer (below characters). Add trunk bridge tiles
(tile 41) behind transparent canopy areas to connect canopy to ground
visually, fixing floating canopy appearance.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>