feat(dictionary): add Hachidori backend support (#266)

src/shared/dictionary-external-link.test.ts

@@ -0,0 +1,19 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { parseDictionaryExternalUrl } from './dictionary-external-link';
+
+test('dictionary links accept web URLs and reject privileged schemes and credentials', () => {
+  assert.equal(
+    parseDictionaryExternalUrl('https://example.com/word?q=猫'),
+    'https://example.com/word?q=%E7%8C%AB',
+  );
+  for (const value of [
+    'file:///etc/passwd',
+    'javascript:alert(1)',
+    'https://user:pass@example.com',
+    null,
+    {},
+  ]) {
+    assert.throws(() => parseDictionaryExternalUrl(value));
+  }
+});