fix(config): align live save feedback with hot reload policy (#255)

src/config/hot-reload.ts

@@ -0,0 +1,64 @@
+function pathStartsWith(path: string, prefix: string): boolean {
+  return path === prefix || path.startsWith(`${prefix}.`);
+}
+
+const HOT_RELOAD_ROOTS = ['subtitleStyle', 'keybindings', 'shortcuts', 'subtitleSidebar'] as const;
+
+const HOT_RELOAD_EXACT_OR_PREFIX_PATHS = [
+  'secondarySub.defaultMode',
+  'mpv.aniskipEnabled',
+  'mpv.aniskipButtonKey',
+  'ankiConnect.ai.enabled',
+  'stats.toggleKey',
+  'stats.markWatchedKey',
+  'logging.level',
+  'logging.rotation',
+  'logging.files',
+  'youtube.primarySubLanguages',
+  'ankiConnect.deck',
+  'ankiConnect.media.normalizeAudio',
+  'ankiConnect.media.mirrorMpvVolume',
+  'ankiConnect.media.reviewTiming',
+  'ankiConnect.behavior.autoUpdateNewCards',
+  'ankiConnect.knownWords.highlightEnabled',
+  'ankiConnect.knownWords.refreshMinutes',
+  'ankiConnect.knownWords.addMinedWordsImmediately',
+  'ankiConnect.knownWords.matchMode',
+  'ankiConnect.knownWords.decks',
+  'ankiConnect.nPlusOne.enabled',
+  'ankiConnect.nPlusOne.minSentenceWords',
+  'ankiConnect.fields.word',
+  'ankiConnect.fields.audio',
+  'ankiConnect.fields.image',
+  'ankiConnect.fields.sentence',
+  'ankiConnect.fields.miscInfo',
+  'ankiConnect.isLapis.sentenceCardModel',
+  'ankiConnect.isKiku.fieldGrouping',
+  'ankiConnect.isSenren.fieldGrouping',
+  'ankiConnect.lapisKiku.wordCardKind',
+] as const;
+
+export function getConfigHotReloadField(path: string): string | null {
+  for (const root of HOT_RELOAD_ROOTS) {
+    if (pathStartsWith(path, root)) {
+      return root;
+    }
+  }
+
+  for (const hotPath of HOT_RELOAD_EXACT_OR_PREFIX_PATHS) {
+    if (pathStartsWith(path, hotPath)) {
+      return hotPath;
+    }
+  }
+
+  // These consumers read the current config when the next operation starts.
+  if (
+    ['jimaku', 'subsync', 'notifications', 'subtitleGeneration'].some((root) =>
+      pathStartsWith(path, root),
+    )
+  ) {
+    return path;
+  }
+
+  return null;
+}