migrate subtitle style config to CSS declaration shape

- Flat style keys (fontFamily, fontSize, hoverTokenColor, etc.) consolidated into subtitleStyle.css, secondary.css, and subtitleSidebar.css objects
- Hover token colors migrated to --subtitle-hover-token-color CSS custom properties
- Plugin app-ping now checks result.status (0=running, 1=stopped) to avoid treating transient failures as stopped
- Note-fields note type picker defaults to configured deck's note type before falling back to Kiku/Lapis
- New migration for legacy ankiConnect N+1 config paths

src/config/settings/jsonc-edit.test.ts

@@ -32,6 +32,39 @@ test('applyConfigSettingsPatchToContent preserves JSONC comments while setting n
   assert.equal(parsed.subtitleStyle.fontSize, 35);
 });
 
+test('applyConfigSettingsPatchToContent updates effective duplicate object path', () => {
+  const input = `{
+  "ankiConnect": {
+    "nPlusOne": {
+      "enabled": true
+    },
+    "knownWords": {
+      "highlightEnabled": true
+    },
+    "nPlusOne": {
+      "minSentenceWords": 3
+    }
+  }
+}`;
+
+  const result = applyConfigSettingsPatchToContent({
+    content: input,
+    operations: [
+      {
+        op: 'set',
+        path: 'ankiConnect.nPlusOne.enabled',
+        value: true,
+      },
+    ],
+    previousWarnings: [],
+  });
+
+  assert.equal(result.ok, true);
+  const parsed = parse(result.content);
+  assert.equal(parsed.ankiConnect.nPlusOne.enabled, true);
+  assert.equal(parsed.ankiConnect.nPlusOne.minSentenceWords, 3);
+});
+
 test('applyConfigSettingsPatchToContent reset removes explicit path', () => {
   const input = `{
   "subtitleStyle": {