feat(config): add configuration window (#70)

src/runtime-options.test.ts

@@ -3,6 +3,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 import test from 'node:test';
 
+import { DEFAULT_CONFIG } from './config';
 import { RuntimeOptionsManager } from './runtime-options';
 
 test('SM-012 runtime options path does not use JSON serialize-clone helpers', () => {
@@ -59,3 +60,25 @@ test('RuntimeOptionsManager returns detached effective Anki config copies', () =
   assert.deepEqual(baseConfig.tags, ['SubMiner']);
   assert.equal(baseConfig.behavior.autoUpdateNewCards, true);
 });
+
+test('RuntimeOptionsManager keeps known-word and n+1 annotation toggles separate', () => {
+  const baseConfig = structuredClone(DEFAULT_CONFIG.ankiConnect);
+  const patches: unknown[] = [];
+  const manager = new RuntimeOptionsManager(() => structuredClone(baseConfig), {
+    applyAnkiPatch: (patch) => {
+      patches.push(patch);
+    },
+    onOptionsChanged: () => undefined,
+  });
+
+  assert.equal(
+    manager.setOptionValue('subtitle.annotation.knownWords.highlightEnabled', true).ok,
+    true,
+  );
+  assert.equal(manager.setOptionValue('subtitle.annotation.nPlusOne', true).ok, true);
+
+  const effective = manager.getEffectiveAnkiConnectConfig();
+  assert.equal(effective.knownWords?.highlightEnabled, true);
+  assert.equal(effective.nPlusOne?.enabled, true);
+  assert.deepEqual(patches, []);
+});