feat(core): engagements, lists and copies with history restore

Engagements store partial dates as value + precision and track field_sources;
lists (list/grouping/thread, grouping-only rating/review) keep dense item
order and snapshot items in history; copies store price in cents. All three
restore through restoreVersion.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/src/history.ts

@@ -3,8 +3,11 @@ import type { Db } from "@sttracker/db/db";
 import { newId, nowIso } from "@sttracker/db/ids";
 import { fromJson, toJson } from "@sttracker/db/json";
 import type { Database } from "@sttracker/db/schema";
+import { restoreCopyFromHistory } from "./copies.ts";
+import { restoreEngagementFromHistory } from "./engagements.ts";
 import { restoreEntryFromHistory } from "./entries.ts";
 import { NotFoundError } from "./errors.ts";
+import { restoreListFromHistory } from "./lists.ts";
 
 /** Who made a change. Plugin actors are `plugin:<pluginId>:<connectionId>`; API tokens are `token:<name>`. */
 export type Actor = "user" | `plugin:${string}:${string}` | `token:${string}`;
@@ -108,6 +111,12 @@ export async function restoreVersion(db: Db, userId: string, historyId: string):
     switch (h.entity as HistoryEntity) {
       case "entry":
         return restoreEntryFromHistory(tx, userId, h.entityId, h.before);
+      case "engagement":
+        return restoreEngagementFromHistory(tx, userId, h.entityId, h.before);
+      case "copy":
+        return restoreCopyFromHistory(tx, userId, h.entityId, h.before);
+      case "list":
+        return restoreListFromHistory(tx, userId, h.entityId, h.before);
       default:
         throw new NotFoundError("history");
     }