feat(settings): group Anki maturity fields under Known Words

- Add maturityEnabled, matureThresholdDays, and per-tier maturity colors to Known Words subsection
- Order maturity color fields new -> learning -> young -> mature
- Route knownWordMaturityColors.* paths through the color control
- Add registry tests for subsection grouping and field ordering

src/config/settings/registry.test.ts

@@ -125,6 +125,32 @@ test('settings registry groups annotation display fields by config group', () =>
   assert.equal(field('subtitleStyle.jlptColors.N1').control, 'color');
 });
 
+test('settings registry groups maturity settings under Known Words with color controls', () => {
+  assert.equal(field('ankiConnect.knownWords.maturityEnabled').subsection, 'Known Words');
+  assert.equal(field('ankiConnect.knownWords.matureThresholdDays').subsection, 'Known Words');
+  for (const tier of ['new', 'learning', 'young', 'mature']) {
+    const tierField = field(`subtitleStyle.knownWordMaturityColors.${tier}`);
+    assert.equal(tierField.subsection, 'Known Words');
+    assert.equal(tierField.control, 'color');
+  }
+});
+
+test('settings registry orders maturity colors from least mature to mature', () => {
+  const knownWordsPaths = fields
+    .filter((candidate) => candidate.subsection === 'Known Words')
+    .map((candidate) => candidate.configPath);
+  assert.deepEqual(knownWordsPaths, [
+    'ankiConnect.knownWords.highlightEnabled',
+    'ankiConnect.knownWords.maturityEnabled',
+    'subtitleStyle.knownWordColor',
+    'ankiConnect.knownWords.matureThresholdDays',
+    'subtitleStyle.knownWordMaturityColors.new',
+    'subtitleStyle.knownWordMaturityColors.learning',
+    'subtitleStyle.knownWordMaturityColors.young',
+    'subtitleStyle.knownWordMaturityColors.mature',
+  ]);
+});
+
 test('settings registry routes known words sync, n+1, and frequency config to behavior', () => {
   assert.equal(field('ankiConnect.knownWords.addMinedWordsImmediately').category, 'behavior');
   assert.equal(field('ankiConnect.knownWords.addMinedWordsImmediately').section, 'Known Words');

src/config/settings/registry.ts

@@ -163,6 +163,12 @@ const PATH_ORDER = new Map<string, number>(
     'ankiConnect.proxy.enabled',
     'ankiConnect.isLapis.enabled',
     'ankiConnect.isKiku.enabled',
+    'subtitleStyle.knownWordColor',
+    'ankiConnect.knownWords.matureThresholdDays',
+    'subtitleStyle.knownWordMaturityColors.new',
+    'subtitleStyle.knownWordMaturityColors.learning',
+    'subtitleStyle.knownWordMaturityColors.young',
+    'subtitleStyle.knownWordMaturityColors.mature',
     'subtitleStyle.fontColor',
     'subtitleStyle.backgroundColor',
     'subtitleStyle.hoverTokenColor',
@@ -517,6 +523,7 @@ function controlForPath(path: string, value: unknown): ConfigSettingsControl {
     return 'key-code';
   }
   if (path.startsWith('subtitleStyle.jlptColors.')) return 'color';
+  if (path.startsWith('subtitleStyle.knownWordMaturityColors.')) return 'color';
   if (path === 'subtitleStyle.frequencyDictionary.bandedColors') return 'color-list';
   if (OPTION_BY_PATH.get(path)?.enumValues?.length) return 'select';
   if (JSON_OBJECT_FIELDS.has(path)) return 'json';
@@ -534,6 +541,9 @@ function controlForPath(path: string, value: unknown): ConfigSettingsControl {
 
 function subsectionForPath(path: string): string | undefined {
   if (path === 'ankiConnect.knownWords.highlightEnabled') return 'Known Words';
+  if (path === 'ankiConnect.knownWords.maturityEnabled') return 'Known Words';
+  if (path === 'ankiConnect.knownWords.matureThresholdDays') return 'Known Words';
+  if (path.startsWith('subtitleStyle.knownWordMaturityColors.')) return 'Known Words';
   if (path === 'ankiConnect.nPlusOne.enabled') return 'N+1';
   if (path === 'subtitleStyle.knownWordColor') return 'Known Words';
   if (path === 'subtitleStyle.nPlusOneColor') return 'N+1';