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-subtitle.ts

@@ -13,6 +13,20 @@ export function buildSubtitleConfigOptionRegistry(
       description:
         'Default primary subtitle bar visibility mode. hidden hides it, visible shows it, hover reveals it on hover.',
     },
+    {
+      path: 'subtitleStyle.css',
+      kind: 'object',
+      defaultValue: defaultConfig.subtitleStyle.css,
+      description:
+        'CSS declaration object applied to primary subtitles after normal subtitle style defaults.',
+    },
+    {
+      path: 'subtitleStyle.secondary.css',
+      kind: 'object',
+      defaultValue: defaultConfig.subtitleStyle.secondary.css,
+      description:
+        'CSS declaration object applied to secondary subtitles after normal subtitle style defaults.',
+    },
     {
       path: 'subtitleStyle.enableJlpt',
       kind: 'boolean',