Add BSA in-memory extraction and nested preview support

bsatk:
- Archive::extractToMemory() extracts a file directly into a byte buffer
  instead of a filesystem path, backed by a std::ostringstream sink.
- Archive::findFile() locates a file by relative path, case-insensitive
  and separator-agnostic, walking the folder tree recursively.
- extractDirect/extractCompressed now take std::ostream& so both the
  ofstream and ostringstream paths share the same implementation.

libbsarch: shim rewrite on Linux to map the Windows API surface onto
bsatk::Archive, enabling preview_bsa to open vanilla BSAs via the
same interface as other plugins.

preview_bsa: double-click on a file in the BSA tree now extracts the
bytes via extractToMemory() and hands them to IOrganizer::previewFileData
for nested preview rendering (e.g. NIF inside a BSA).

uibase + organizerproxy + organizercore: new IOrganizer::previewFileData
virtual that routes in-memory file bytes through the first registered
IPluginPreview matching the extension. Uses heap + WA_DeleteOnClose +
open() to avoid nested exec() softlock from mod info filetree ->
preview_bsa tree -> nif preview.

docker/build-inner.sh: stage preview_nif shaders into plugin_data/shaders
so ShaderManager can load them via IOrganizer::getPluginDataPath().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/libs/uibase/include/uibase/imoinfo.h b/libs/uibase/include/uibase/imoinfo.h
index a9ec3d8..1725410 100644
--- a/libs/uibase/include/uibase/imoinfo.h
+++ b/libs/uibase/include/uibase/imoinfo.h
@@ -21,11 +21,13 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 #ifndef IMOINFO_H
 #define IMOINFO_H
 
+#include <QByteArray>
 #include <QDir>
 #include <QList>
 #include <QMainWindow>
 #include <QString>
 #include <QVariant>
+#include <QWidget>
 #include <cstdint>
 #include <any>
 #include <functional>
@@ -370,6 +372,25 @@ public:
   virtual IGameFeatures* gameFeatures() const = 0;
 
   /**
+   * @brief show a preview dialog for a file loaded from an in-memory buffer.
+   *
+   * Routes @p fileData through the first registered IPluginPreview that
+   * supports @p fileName's extension and archives. Used by plugins that have
+   * already extracted a blob from a container (e.g. preview_bsa) and want to
+   * hand it off to another preview plugin (e.g. preview_nif) without writing
+   * it to a temp file.
+   *
+   * @param parent   parent for the modal preview dialog
+   * @param fileName virtual filename; used for extension dispatch and as the
+   *                 dialog title
+   * @param fileData raw file bytes
+   * @return true if a preview plugin was found and the dialog was shown;
+   *         false otherwise (no suitable plugin / empty data).
+   */
+  virtual bool previewFileData(QWidget* parent, const QString& fileName,
+                               const QByteArray& fileData) = 0;
+
+  /**
    * @brief runs a program using the virtual filesystem
    *
    * @param executable  either the name of an executable configured in MO, or