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/config/definitions/options-integrations.ts

@@ -278,6 +278,12 @@ export function buildIntegrationConfigOptionRegistry(
       defaultValue: defaultConfig.ankiConnect.knownWords.addMinedWordsImmediately,
       description: 'Immediately append newly mined card words into the known-word cache.',
     },
+    {
+      path: 'ankiConnect.nPlusOne.enabled',
+      kind: 'boolean',
+      defaultValue: defaultConfig.ankiConnect.nPlusOne.enabled,
+      description: 'Enable N+1 subtitle highlighting (highlights the one unknown word in a sentence). Requires known-word cache data.',
+    },
     {
       path: 'ankiConnect.nPlusOne.minSentenceWords',
       kind: 'number',