Add opt-in KSwitcher LAN discovery and mutual code pairing preview

src/app.cpp

@@ -559,6 +559,7 @@ App::App(HINSTANCE h, bool test, const std::filesystem::path &dataRoot, HWND ser
 }
 App::~App()
 {
+    lanService.reset();
     stopBrowserChatMonitor();
     if (auto host = historyController(historyProcess)) PostMessageW(host, WM_CLOSE, 0, 0);
     if (historyProcess) CloseHandle(historyProcess);
@@ -721,6 +722,11 @@ bool App::registerHotkeys(const Settings &s, bool rollback)
     return true;
 }
 
+Bytes App::lanCommand(const Bytes &command)
+{
+    if (!lanService) lanService = std::make_unique<LanService>(data);
+    return lanService->command(command);
+}
 void App::applySettings(const Settings &requested)
 {
     Settings s = requested;
@@ -2332,6 +2338,9 @@ int App::execute()
     scheduleHistoryOcr(settings);
     addTray();
     if (!smoke) startBrowserChatMonitor();
+    if (!smoke && std::filesystem::exists(data / L"lan-pairing.bin"))
+        try { lanService = std::make_unique<LanService>(data); }
+        catch (const std::exception &e) { report(L"LAN module: " + wide(e.what())); }
     SetTimer(window, 1, 60000, nullptr);
     if (!smoke) SetTimer(window, 6, 1000, nullptr);
     SetThreadExecutionState(ES_CONTINUOUS |