feat: configurable OPDS download folder and filename format (#2571)

src/SettingsList.h

@@ -194,6 +194,16 @@ inline std::vector<SettingInfo> getSettingsList(const SdCardFontRegistry* regist
         SettingInfo::Toggle(StrId::STR_MOVE_FINISHED_TO_READ, &CrossPointSettings::moveFinishedToReadFolder,
                             "moveFinishedToReadFolder", StrId::STR_CAT_SYSTEM),
 
+        // OPDS download folder: persisted + web-exposed, but category-less so it
+        // is hidden from the on-device Settings screen (edited via OPDS UI).
+        SettingInfo::String(StrId::STR_OPDS_DOWNLOAD_FOLDER, &SETTINGS.opdsDownloadFolder[0],
+                            sizeof(SETTINGS.opdsDownloadFolder), "opdsDownloadFolder"),
+        // OPDS download filename format: persisted + web-exposed, category-less so it
+        // is hidden from the on-device Settings screen (cycled from the OPDS UI).
+        SettingInfo::Enum(StrId::STR_OPDS_FILENAME_FORMAT, &CrossPointSettings::opdsFilenameFormat,
+                          {StrId::STR_FMT_AUTHOR_TITLE, StrId::STR_FMT_TITLE_AUTHOR, StrId::STR_FMT_TITLE},
+                          "opdsFilenameFormat"),
+
         // --- KOReader Sync (web-only, uses KOReaderCredentialStore) ---
         SettingInfo::DynamicString(
             StrId::STR_KOREADER_USERNAME, [] { return KOREADER_STORE.getUsername(); },