The tile list in the tilemap section is a palette of pictures: each tile shows its lone tile (the four convex corners for floor and wall, the picture itself for none) with its name below, laid out with the image-picker grid (#139)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/core/tile.test.ts

@@ -14,6 +14,7 @@ import type { TileAsset } from '../../src/core/model/Asset';
 import { isPlaceableType } from '../../src/core/model/AssetTypes';
 import {
   autotileCombinations,
+  loneTileQuadrants,
   type Neighbours,
   neighboursAt,
   SAMPLE_PATTERN,
@@ -249,6 +250,28 @@ describe('autotile blocks', () => {
     expect([corner.n, corner.e, corner.ne]).toEqual([true, true, false]);
     expect(tileQuadrants('floor', corner)[1]).toEqual({ x: 3, y: 0 });
   });
+
+  it('shows each kind in the palette as its lone tile, the four convex corners (#139)', () => {
+    expect(loneTileQuadrants('floor')).toEqual([
+      { x: 0, y: 2 },
+      { x: 3, y: 2 },
+      { x: 0, y: 5 },
+      { x: 3, y: 5 },
+    ]);
+    expect(loneTileQuadrants('wall')).toEqual([
+      { x: 0, y: 0 },
+      { x: 3, y: 0 },
+      { x: 0, y: 3 },
+      { x: 3, y: 3 },
+    ]);
+    // A plain tile is its picture as it is, each corner its own quarter.
+    expect(loneTileQuadrants('none')).toEqual([
+      { x: 0, y: 0 },
+      { x: 1, y: 0 },
+      { x: 0, y: 1 },
+      { x: 1, y: 1 },
+    ]);
+  });
 });
 
 describe('tile asset', () => {