Add Root Builder plugin, Linux game detection, and OMOD installer fix

- New native Root Builder plugin (src/plugins/rootbuilder.py) with copy
  and symlink deploy modes, auto-deploy hooks, backup/restore, and
  third-party conflict detection that moves incompatible plugins to
  DisabledPlugins/. In link mode, .exe/.dll are always copied to avoid
  Wine/Proton path resolution issues with symlinked executables.

- Fix basic_games detection on Linux: steam_utils now checks native
  Steam paths (~/.local/share/Steam, Flatpak, Snap), epic_utils uses
  correct Linux Heroic config paths, gog_utils falls back to Heroic
  GOG installed.json when Windows registry is unavailable.

- Fix OMOD installer crash: isArchiveSupported now handles both IFileTree
  (from mod list refresh) and string (from install check) arguments.

- Add flatpak manifest step to copy source-tree Python plugins
  (src/plugins/*.py) into the build output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/libs/uibase/include/uibase/filesystemutilities.h b/libs/uibase/include/uibase/filesystemutilities.h
index ae074c6..a98ba7b 100644
--- a/libs/uibase/include/uibase/filesystemutilities.h
+++ b/libs/uibase/include/uibase/filesystemutilities.h
@@ -31,6 +31,18 @@ QDLLEXPORT QString sanitizeFileName(const QString& name,
  **/
 QDLLEXPORT bool validFileName(const QString& name);
 
+/**
+ * @brief Resolve a file path case-insensitively on Linux.
+ *
+ * On Windows (case-insensitive FS), returns the input path as-is.
+ * On Linux, if the exact path doesn't exist, searches the parent directory
+ * for a file matching the name case-insensitively.
+ *
+ * @param path the absolute file path to resolve
+ * @return the resolved path (with correct case) or the original path if not found
+ */
+QDLLEXPORT QString resolveFileCaseInsensitive(const QString& path);
+
 }  // namespace MOBase
 
 #endif  // FILESYSTEM_H
diff --git a/libs/uibase/src/filesystemutilities.cpp b/libs/uibase/src/filesystemutilities.cpp
index 6a01324..b027f5f 100644
--- a/libs/uibase/src/filesystemutilities.cpp
+++ b/libs/uibase/src/filesystemutilities.cpp
@@ -1,5 +1,7 @@
 #include <uibase/filesystemutilities.h>
 
+#include <QDir>
+#include <QFileInfo>
 #include <QRegularExpression>
 #include <QString>
 
@@ -65,4 +67,32 @@ bool validFileName(const QString& name)
   return (name == sanitizeFileName(name));
 }
 
+QString resolveFileCaseInsensitive(const QString& path)
+{
+#ifdef _WIN32
+  return QDir::cleanPath(path);
+#else
+  const QFileInfo info(path);
+  if (info.exists()) {
+    return info.absoluteFilePath();
+  }
+
+  QDir dir(info.path());
+  if (!dir.exists()) {
+    return QDir::cleanPath(path);
+  }
+
+  const QString target = info.fileName();
+  const QStringList entries =
+      dir.entryList(QDir::Files | QDir::Readable | QDir::Hidden | QDir::System);
+  for (const QString& entry : entries) {
+    if (entry.compare(target, Qt::CaseInsensitive) == 0) {
+      return dir.absoluteFilePath(entry);
+    }
+  }
+
+  return QDir::cleanPath(path);
+#endif
+}
+
 }  // namespace MOBase