feat(config): add subtitle CSS editor, nPlusOne.enabled flag, and fix se

- subtitleStyle.css / subtitleStyle.secondary.css replace flat style fields in the settings window
- ankiConnect.nPlusOne.enabled gates known-word cache independently of knownWords.highlightEnabled
- Settings search now covers all categories, narrows on multi-word terms, and hides editor-owned fields
- Default note-type picker to Kiku then Lapis; rename isLapis.sentenceCardModel default to "Lapis"

src/anki-integration/known-word-cache.ts

@@ -277,7 +277,8 @@ export class KnownWordCacheManager {
   }
 
   private isKnownWordCacheEnabled(): boolean {
-    return this.deps.getConfig().knownWords?.highlightEnabled === true;
+    const config = this.deps.getConfig();
+    return config.knownWords?.highlightEnabled === true || config.nPlusOne?.enabled === true;
   }
 
   private shouldAddMinedWordsImmediately(): boolean {