feat: Doing more polishing (M8b)

web/js/save/codec.js

@@ -46,6 +46,13 @@ export function encodeSave(state) {
 export const MIGRATIONS = {
   // v2 added the world cycle: older saves start it at neutral.
   1: (s) => ({ ...s, version: 2, world: { cycle: 0 } }),
+  // v3 replaced the single pending card by the in-tray queue.
+  2: ({ pendingCard, ...s }) => ({
+    ...s,
+    version: 3,
+    inbox: pendingCard ? [{ id: pendingCard.id, day: pendingCard.day }] : [],
+    pending: { ...s.pending, weeklyCard: Boolean(s.pending?.weeklyCard) && !pendingCard, inboxFull: false },
+  }),
 };
 
 export function migrate(state) {
@@ -55,7 +62,11 @@ export function migrate(state) {
   while (s.version < STATE_VERSION) {
     const step = MIGRATIONS[s.version];
     if (!step) return { ok: false, error: "version" };
-    s = step(s);
+    try {
+      s = step(s);
+    } catch {
+      return { ok: false, error: "format" }; // a damaged or hostile save must never throw
+    }
   }
   return { ok: true, state: s };
 }