Add shared-scene 2D authoring, sprite animation and Rapier2D physics

editor/editor.css

@@ -2227,3 +2227,93 @@ button:hover:not(:disabled) {
     width: 100%;
   }
 }
+/* Shared-scene 2D authoring tools */
+.property input[type="number"] {
+  min-width: 0;
+  width: 95px;
+}
+.pair2d .property {
+  padding: 2px 0;
+}
+.tile-tools {
+  display: flex;
+  gap: 4px;
+  margin: 8px 0;
+}
+.tile-palette {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
+  gap: 4px;
+  max-height: 240px;
+  overflow: auto;
+}
+.tile-palette button {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-direction: column;
+  min-height: 52px;
+  background: #25292b;
+}
+.frame-thumb {
+  display: inline-block;
+  background-repeat: no-repeat;
+}
+.clip2d {
+  border: 1px solid var(--line, #42484a);
+  padding: 8px;
+  margin: 8px 0;
+}
+.sprite-editor {
+  display: grid;
+  grid-template-columns: minmax(200px, 1fr) 290px;
+  gap: 20px;
+  padding: 20px;
+  max-height: 75vh;
+  overflow: auto;
+}
+.sprite-sheet {
+  align-self: start;
+  background: repeating-conic-gradient(#25292b 0% 25%, #363c3f 0% 50%) 50%/24px
+    24px;
+  overflow: hidden;
+}
+.sprite-rect {
+  position: absolute;
+  border: 1px solid #69c9ff !important;
+  border-radius: 0 !important;
+  background: transparent !important;
+  padding: 0 !important;
+  font-size: 10px;
+  text-align: left;
+  color: white;
+  text-shadow: 0 1px 2px black;
+}
+.sprite-rect.selected {
+  border: 2px solid #ffe48a !important;
+}
+.sprite-rect i {
+  position: absolute;
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: #ffe48a;
+  transform: translate(-50%, -50%);
+}
+.sprite-editor h3 {
+  margin: 18px 0 8px;
+}
+.sprite-editor .property input {
+  max-width: 145px;
+}
+.sprite-editor button {
+  margin: 3px 0;
+}
+.asset-art.image {
+  overflow: hidden;
+}
+@media (max-width: 700px) {
+  .sprite-editor {
+    grid-template-columns: 1fr;
+  }
+}