add export timelapse

src/app_dialogs.cpp

@@ -646,6 +646,28 @@ void App::dialog_ppbr_export()
     };
 }
 
+void App::dialog_timelapse_export()
+{
+#if __IOS__ || __WEB__
+    pick_file_save("mp4",
+        [this](std::string path) {
+            rec_export(path);
+        },
+        [this](bool saved) {
+            message_box("Export Timelapse", "Timelapse exported succesfully.");
+        }
+    );
+#else
+    pick_file_save({ "mp4" }, [this](std::string path) {
+        std::thread([this, path] {
+            BT_SetTerminate();
+            rec_export(path);
+            message_box("Export Timelapse", "Timelapse exported to: " + path);
+        }).detach();
+    });
+#endif
+}
+
 void App::dialog_export_mp4()
 {
     std::thread([this] {