fix: settings persist on font clear, reserve() before push_back, minor (#2519)

src/JsonSettingsIO.cpp

@@ -5,6 +5,7 @@
 #include <Logging.h>
 #include <ObfuscationUtils.h>
 
+#include <algorithm>
 #include <cstring>
 #include <string>
 
@@ -153,10 +154,6 @@ bool JsonSettingsIO::saveSettings(const CrossPointSettings& s, const char* path)
   // Stored as ISO code string ("EN", "DE", ...) for stability across enum reorders.
   doc["language"] = (s.language < getLanguageCount()) ? LANGUAGE_CODES[s.language] : "EN";
 
-  // Language -- managed by LanguageSelectActivity, not in SettingsList.
-  // Stored as ISO code string ("EN", "DE", ...) for stability across enum reorders.
-  doc["language"] = (s.language < getLanguageCount()) ? LANGUAGE_CODES[s.language] : "EN";
-
   String json;
   serializeJson(doc, json);
   return Storage.writeFile(path, json);
@@ -345,6 +342,7 @@ bool JsonSettingsIO::loadRecentBooks(RecentBooksStore& store, const char* json)
 
   store.recentBooks.clear();
   JsonArray arr = doc["books"].as<JsonArray>();
+  store.recentBooks.reserve(std::min(arr.size(), (size_t)10));
   for (JsonObject obj : arr) {
     if (store.getCount() >= 10) break;
     RecentBook book;