feat(tabletop): let candidates inherit and override route stacking

Candidates now carry their own stacking strategy, inheriting the route's
when absent, so the default tilt applies consistently. Drop the now
redundant explicit tilt from the poker deck.

packages/tabletop/src/state.test.ts

@@ -98,6 +98,22 @@ describe('computeSurfacePlacements', () => {
     expect(placements[0]!.candidate).toEqual({ seat: '0', x: 40, y: 5, rotation: 1 });
   });
 
+  it('keeps the candidate stacking alongside its anchor', () => {
+    const surface = makeSurface({
+      layout: [
+        {
+          route: '/dock/:seat',
+          x: 0,
+          y: 0,
+          rotation: 0,
+          candidates: [{ seat: '0', x: 40, y: 5, stacking: { tilt: 2 } }],
+        },
+      ],
+    });
+    const placements = computeSurfacePlacements(surface, { '/dock/0': ['harbor:boat#fleet'] });
+    expect(placements[0]!.candidate).toEqual({ seat: '0', x: 40, y: 5, stacking: { tilt: 2 } });
+  });
+
   it('keeps the same piece on two paths as distinct placements', () => {
     const surface = makeSurface({
       layout: [