feat(stats): add library entry merge and episode move (#190)

src/core/utils/title-normalization.test.ts

@@ -0,0 +1,7 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { normalizeTitleIdentity } from './title-normalization';
+
+test('normalizeTitleIdentity produces a Unicode-aware comparison key', () => {
+  assert.equal(normalizeTitleIdentity('  ＢＯＣＣＨＩ・The ROCK!!  '), 'bocchi the rock');
+});

src/core/utils/title-normalization.ts

@@ -0,0 +1,8 @@
+export function normalizeTitleIdentity(title: string): string {
+  return title
+    .normalize('NFKC')
+    .toLowerCase()
+    .replace(/[^\p{L}\p{N}]+/gu, ' ')
+    .trim()
+    .replace(/\s+/g, ' ');
+}