Ensure main menu in MAIN_STATE before multiplayer

Add EnsureMainMenuMainState to try returning the main menu to MAIN_STATE by repeatedly invoking onCancelPress (up to 12 attempts with args true,false). Modify OpenMultiplayerMenu to early-return on null, call the new helper and log a warning if it cannot restore MAIN_STATE before proceeding, and preserve the existing uiMovie handling.

plugin/src/F4TMainMenuInject.cpp

@@ -356,9 +356,45 @@ namespace F4T::MainMenuInject
 			TryInjectForStartMenu(a_this);
 		}
 
+		bool EnsureMainMenuMainState(RE::MainMenu* a_mainMenu)
+		{
+			if (!a_mainMenu || !a_mainMenu->menuObj.IsObject()) {
+				return false;
+			}
+
+			if (IsMainStateForMenu(a_mainMenu)) {
+				return true;
+			}
+
+			constexpr auto kMaxCancelAttempts = 12;
+			const std::array<Scaleform::GFx::Value, 2> cancelArgs{
+				Scaleform::GFx::Value{ true },
+				Scaleform::GFx::Value{ false }
+			};
+
+			for (int attempt = 0; attempt < kMaxCancelAttempts; ++attempt) {
+				if (IsMainStateForMenu(a_mainMenu)) {
+					return true;
+				}
+
+				a_mainMenu->menuObj.Invoke("onCancelPress", nullptr, cancelArgs.data(), cancelArgs.size());
+			}
+
+			return IsMainStateForMenu(a_mainMenu);
+		}
+
 		void OpenMultiplayerMenu(RE::MainMenu* a_mainMenu)
 		{
-			if (a_mainMenu && a_mainMenu->uiMovie) {
+			if (!a_mainMenu) {
+				return;
+			}
+
+			if (!EnsureMainMenuMainState(a_mainMenu)) {
+				LogWarning("Could not return MainMenu to MAIN_STATE before opening multiplayer browser.");
+				return;
+			}
+
+			if (a_mainMenu->uiMovie) {
 				Scaleform::GFx::Value bgsCode;
 				if (a_mainMenu->menuObj.IsObject() &&
 					a_mainMenu->menuObj.GetMember("BGSCodeObj", &bgsCode) &&