Implement the 029-on-demand-bestiary feature that replaces the bundled XMM bestiary JSON with a compact search index (~350KB) and on-demand source loading, where users explicitly provide a URL or upload a JSON file to fetch full stat block data per source, which is then normalized and cached in IndexedDB (with in-memory fallback) so creature stat blocks load instantly on subsequent visits while keeping the app bundle small and never auto-fetching copyrighted content

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/adapters/bestiary-adapter.ts

@@ -81,9 +81,11 @@ interface RawSpellcasting {
 
 // --- Source mapping ---
 
-const SOURCE_DISPLAY_NAMES: Record<string, string> = {
-	XMM: "MM 2024",
-};
+let sourceDisplayNames: Record<string, string> = {};
+
+export function setSourceDisplayNames(names: Record<string, string>): void {
+	sourceDisplayNames = names;
+}
 
 // --- Size mapping ---
 
@@ -353,7 +355,13 @@ function makeCreatureId(source: string, name: string): CreatureId {
  * Normalizes raw 5etools bestiary JSON into domain Creature[].
  */
 export function normalizeBestiary(raw: { monster: RawMonster[] }): Creature[] {
-	return raw.monster.map((m) => {
+	// Filter out _copy entries — these reference another source's monster
+	// and lack their own stats (ac, hp, cr, etc.)
+	const monsters = raw.monster.filter(
+		// biome-ignore lint/suspicious/noExplicitAny: raw JSON may have _copy field
+		(m) => !(m as any)._copy,
+	);
+	return monsters.map((m) => {
 		const crStr = extractCr(m.cr);
 		const ac = extractAc(m.ac);
 
@@ -361,7 +369,7 @@ export function normalizeBestiary(raw: { monster: RawMonster[] }): Creature[] {
 			id: makeCreatureId(m.source, m.name),
 			name: m.name,
 			source: m.source,
-			sourceDisplayName: SOURCE_DISPLAY_NAMES[m.source] ?? m.source,
+			sourceDisplayName: sourceDisplayNames[m.source] ?? m.source,
 			size: formatSize(m.size),
 			type: formatType(m.type),
 			alignment: formatAlignment(m.alignment),