Add portable mode for Windows

Detect portable marker file (portable or portable.txt) next to exe
and store data/cache in app directory instead of AppData.

ZIP package includes marker file for out-of-box portable use.

CMakeModules/PreparePortableZip.cmake.in

@@ -0,0 +1,41 @@
+# Prepare portable ZIP contents
+# Copies installed files to a separate directory with runtime DLLs in root
+
+set(SOURCE_DIR "@CMAKE_INSTALL_PREFIX@")
+set(ZIP_DIR "@CMAKE_CURRENT_BINARY_DIR@/portable")
+set(PROJECT_SOURCE_DIR "@PROJECT_SOURCE_DIR@")
+
+# Clean and create ZIP staging directory
+file(REMOVE_RECURSE "${ZIP_DIR}")
+file(MAKE_DIRECTORY "${ZIP_DIR}")
+
+# Copy all files except redist folder and vc_redist installer
+file(GLOB_RECURSE ALL_FILES RELATIVE "${SOURCE_DIR}" "${SOURCE_DIR}/*")
+foreach(f ${ALL_FILES})
+  # Skip redist folder and VCRedist installer
+  if(f MATCHES "^redist/" OR f STREQUAL "vc_redist.x64.exe")
+    continue()
+  endif()
+
+  get_filename_component(dir "${f}" DIRECTORY)
+  if(dir)
+    file(MAKE_DIRECTORY "${ZIP_DIR}/${dir}")
+  endif()
+  file(COPY "${SOURCE_DIR}/${f}" DESTINATION "${ZIP_DIR}/${dir}")
+endforeach()
+
+# Copy runtime DLLs to root (for portable use)
+set(VCRUNTIME_DIR "${PROJECT_SOURCE_DIR}/deps/vcruntime")
+if(EXISTS "${VCRUNTIME_DIR}")
+  file(GLOB RUNTIME_DLLS "${VCRUNTIME_DIR}/*.dll")
+  foreach(dll ${RUNTIME_DLLS})
+    file(COPY "${dll}" DESTINATION "${ZIP_DIR}")
+  endforeach()
+  message(STATUS "Bundled VC runtime DLLs for portable package")
+endif()
+
+# Create portable marker file
+file(WRITE "${ZIP_DIR}/portable" "")
+message(STATUS "Created portable marker file")
+
+message(STATUS "Portable package prepared in: ${ZIP_DIR}")

src/main.cpp

@@ -193,7 +193,15 @@ int main(int argc, char *argv[])
       return EXIT_SUCCESS;
     }
 
-    // Handle config-dir first (affects where profiles.json is located)
+    // Check for portable mode (marker file next to exe)
+    if (Paths::detectAndEnablePortableMode())
+    {
+      // Portable mode sets its own paths, skip config-dir
+      QSettings::setPath(QSettings::NativeFormat, QSettings::UserScope,
+                         Paths::globalDataDir());
+    }
+
+    // Handle config-dir (overrides portable mode if explicitly set)
     auto configDir = parser.value("config-dir");
     if (!configDir.isEmpty())
     {

src/shared/Paths.cpp

@@ -15,7 +15,9 @@
 
 /////////////////////////////////////////////////////////////////////////////////////////
 static QString g_configDirOverride;
+static QString g_cacheDirOverride;
 static QString g_activeProfileId;
+static bool g_portableMode = false;
 
 /////////////////////////////////////////////////////////////////////////////////////////
 void Paths::setConfigDir(const QString& path)
@@ -23,6 +25,42 @@ void Paths::setConfigDir(const QString& path)
   g_configDirOverride = path;
 }
 
+/////////////////////////////////////////////////////////////////////////////////////////
+void Paths::setCacheDir(const QString& path)
+{
+  g_cacheDirOverride = path;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+bool Paths::isPortableMode()
+{
+  return g_portableMode;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+bool Paths::detectAndEnablePortableMode()
+{
+#ifdef Q_OS_WIN
+  QString appDir = QGuiApplication::applicationDirPath();
+
+  // Check for portable marker file
+  if (QFile::exists(appDir + "/portable") || QFile::exists(appDir + "/portable.txt"))
+  {
+    QString dataPath = appDir + "/data";
+    QString cachePath = appDir + "/cache";
+
+    g_portableMode = true;
+    g_configDirOverride = dataPath;
+    g_cacheDirOverride = cachePath;
+
+    qInfo() << "Portable mode enabled, data:" << dataPath;
+    return true;
+  }
+#endif
+
+  return false;
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////
 static QDir writableLocation(QStandardPaths::StandardLocation loc)
 {
@@ -93,7 +131,22 @@ QString Paths::globalDataDir(const QString& file)
 /////////////////////////////////////////////////////////////////////////////////////////
 QString Paths::globalCacheDir(const QString& file)
 {
-  QDir d = writableLocation(QStandardPaths::GenericCacheLocation);
+  QDir d;
+
+  if (!g_cacheDirOverride.isEmpty())
+  {
+    d = QDir(g_cacheDirOverride);
+    if (!d.mkpath(d.absolutePath()))
+    {
+      qWarning() << "Failed to create cache override directory:" << d.absolutePath();
+      d = writableLocation(QStandardPaths::GenericCacheLocation);
+    }
+  }
+  else
+  {
+    d = writableLocation(QStandardPaths::GenericCacheLocation);
+  }
+
   if (file.isEmpty())
     return d.absolutePath();
   return d.filePath(file);

src/shared/Paths.h

@@ -12,6 +12,9 @@
 namespace Paths
 {
   void setConfigDir(const QString& path);
+  void setCacheDir(const QString& path);
+  bool isPortableMode();
+  bool detectAndEnablePortableMode();
   QString resourceDir(const QString& file = QString());
   QString socketName(const QString& serverName);
   QString soundsPath(const QString& sound);