chat_settings: [chat] config section + live sync + fix test segfault

- New chat_setting.c/h: unified chat settings API (int/str getters)
- Config parser supports [chat] section, calls chat_setting_set per key
- chat_core exposes chat_core_set_setting / trampoline for GUI bridge
- chatgui: AudioDevice + Storage pages persist to [chat] config + live apply
- chatgui-android: ConfigProvider, NativeLib, headless handle chat settings
- MessageList: 200 msg limit, fixed saveChannelState via trampoline
- test_media_delivery_full: fix segfault at shutdown (mon() timer vs freed conns)

tools/chatgui/src/storagesettingspage.cpp

@@ -1,6 +1,7 @@
 #include "storagesettingspage.h"
 #include "../db/db_manager.h"
 #include "../transport/gui_bridge.h"
+#include "../transport/config_updater.h"
 #include "../../lib/mem.h"
 extern "C" {
 #include "chat/chat_core.h"
@@ -22,6 +23,19 @@ static void saveUiStateInt(const char* key, int val) {
     gui_bridge_post_uasync_fn(chat_core_save_ui_state_trampoline, arg);
 }
 
+static void postChatSetting(const QString& configPath, const char* name, int val) {
+    /* persist to config file */
+    config_update_option(configPath, "chat", name, QString::number(val), CONFIG_UPDATE_REPLACE);
+    /* apply on-the-fly via bridge */
+    QByteArray v = QByteArray::number(val);
+    size_t nlen = strlen(name), vlen = (size_t)v.size(), total = nlen + 1 + vlen + 1;
+    if (total > 256) return;
+    void* arg = u_malloc(total);
+    memcpy(arg, name, nlen + 1);
+    memcpy((char*)arg + nlen + 1, v.constData(), vlen + 1);
+    gui_bridge_post_uasync_fn(chat_core_set_setting_trampoline, arg);
+}
+
 StorageSettingsPage::StorageSettingsPage(DbManager* db, QWidget* parent)
     : QWidget(parent)
     , m_db(db)
@@ -84,7 +98,17 @@ void StorageSettingsPage::loadFromDb() {
 }
 
 void StorageSettingsPage::applyAndSave() {
-    saveUiStateInt("storage_autoload", m_autoloadCheck->isChecked() ? 1 : 0);
-    saveUiStateInt("storage_autoload_maxsize_mb", m_autoloadMaxSize->value());
-    saveUiStateInt("storage_maxsize_gb", m_maxStorageSize->value());
+    int autoload        = m_autoloadCheck->isChecked() ? 1 : 0;
+    int autoloadMaxSize = m_autoloadMaxSize->value();
+    int maxGb           = m_maxStorageSize->value();
+
+    saveUiStateInt("storage_autoload", autoload);
+    saveUiStateInt("storage_autoload_maxsize_mb", autoloadMaxSize);
+    saveUiStateInt("storage_maxsize_gb", maxGb);
+
+    if (!m_configPath.isEmpty()) {
+        postChatSetting(m_configPath, "storage_autoload", autoload);
+        postChatSetting(m_configPath, "storage_autoload_maxsize_mb", autoloadMaxSize);
+        postChatSetting(m_configPath, "storage_maxsize_gb", maxGb);
+    }
 }