Shared: load sprite sheets resiliently (curated Space subset may 404 some shadows)

setCharacter used Promise.all, so one missing shadow/companion PNG threw and the
sprite was never created on the Space (curated assets omit some _Shadows sheets).
Load each sheet independently and skip failures — degrade gracefully (no shadow)
instead of breaking the character. React (full assets) is unaffected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/scene.js

@@ -328,16 +328,19 @@ function createSpriteScene(pixi, host, opts = {}) {
         e.shadow ? { gridKey: "shd:x:" + e.key, url: e.shadow, type: "body" } : null
       ].filter(Boolean))
     ];
-    const texs = await Promise.all(sheets.map((s) => Assets.load(urlFor(s.url))));
+    const texs = await Promise.all(sheets.map((s) => Assets.load(urlFor(s.url)).then((t) => t, () => null)));
     if (!app) return;
-    const grids = {};
     const idleIdx = sheets.findIndex((s) => s.gridKey === "idle");
+    if (idleIdx < 0 || !texs[idleIdx]) return;
+    const grids = {};
     const cell = cellOf(texs[idleIdx].source.height);
     sheets.forEach((s, i) => {
-      texs[i].source.scaleMode = "nearest";
-      if (s.type === "proj") grids[s.gridKey] = sliceGrid(texs[i], Math.max(1, Math.round(texs[i].source.height / ROWS)));
-      else if (s.type === "imp") grids[s.gridKey] = sliceGrid(texs[i], Math.max(1, texs[i].source.height));
-      else grids[s.gridKey] = sliceGrid(texs[i], cell);
+      const t = texs[i];
+      if (!t) return;
+      t.source.scaleMode = "nearest";
+      if (s.type === "proj") grids[s.gridKey] = sliceGrid(t, Math.max(1, Math.round(t.source.height / ROWS)));
+      else if (s.type === "imp") grids[s.gridKey] = sliceGrid(t, Math.max(1, t.source.height));
+      else grids[s.gridKey] = sliceGrid(t, cell);
     });
     frames = grids;
     extras = active.extras ?? [];