VFS perf fixes, icon/stylesheet compat, download filename fix

VFS:
- Open backing fd at mo2_open time for read-only handles so mo2_read can
  splice without re-opening the file on every read call.
- Bump RLIMIT_NOFILE at mount time to fit the resulting fd pressure when
  the game keeps hundreds of BSAs open.
- Dedicated node_cache_mutex so resolveByInode / mo2_lookup stop racing
  unordered_map writes while multiple tree_mutex readers are active.
- max_read=1MB + matching conn->max_read and raised max_readahead/max_write
  so the kernel merges Wine's small sequential reads into bigger FUSE
  requests.
- Per-op wall-clock counters in mo2_init() logs so we can distinguish VFS
  latency from game-side work.

Proton launch:
- Write dxvk.conf to the prefix and set DXVK_CONFIG_FILE to force
  dxvk.enableGraphicsPipelineLibrary=False, avoiding long GPL compile
  stalls on first run.

UI / plugin compat:
- Clamp IconDelegate's per-icon width to [8, 16] so narrow content
  columns don't trigger QIcon::pixmap(0,0) returning null and logging
  "failed to load icon" every repaint.
- Pre-create lowercase symlinks in the stylesheet directory so QSS files
  authored on Windows resolve url(foo.svg) when on-disk files are Foo.svg.
- Flip content icons empty-chessboard.png and facegen.png to 8-bit RGBA
  so Qt's built-in PNG reader loads them uniformly.
- Add mobase.Version.canonicalString shim for legacy Python plugins that
  still call the old VersionInfo method on appVersion()'s return.
- BSPluginList: compare normalized plugin name lists instead of byte
  hashes so the post-run case-fix refresh stops spuriously firing the
  "load order changed" dialog.
- BSPluginList disabled by default.

Download manager:
- Parse CDN URL with QUrl + QUrlQuery and read the filename from the
  response-content-disposition query param (RFC 6266 quoted / unquoted /
  ext-value forms), not QFileInfo on the raw URL.
- When the API or URL gives us a CDN object key (no archive extension),
  prefer the actual Content-Disposition header from the live response in
  metaDataChanged and downloadFinished.

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

1 files changed, 78 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/BSPluginInfo/PluginRecordView.h b/libs/installer_bsplugins/src/BSPluginInfo/PluginRecordView.h
new file mode 100644
index 0000000..880cc1a
--- /dev/null
+++ b/libs/installer_bsplugins/src/BSPluginInfo/PluginRecordView.h
@@ -0,0 +1,78 @@
+#ifndef BSPLUGININFO_PLUGINRECORDVIEW_H
+#define BSPLUGININFO_PLUGINRECORDVIEW_H
+
+#include "PluginRecordModel.h"
+#include "RecordFilterProxyModel.h"
+#include "RecordStructureModel.h"
+
+#include <QWidget>
+
+class QSplitter;
+class QTreeView;
+namespace Ui
+{
+class PluginRecordView;
+}
+
+namespace BSPluginInfo
+{
+
+class PluginRecordView final : public QWidget
+{
+  Q_OBJECT
+
+public:
+  enum ConflictFilter
+  {
+    Filter_AllConflicts,
+    Filter_WinningConflicts,
+    Filter_LosingConflicts,
+  };
+
+  explicit PluginRecordView(QWidget* parent = nullptr);
+
+  PluginRecordView(const PluginRecordView&) = delete;
+  PluginRecordView(PluginRecordView&&)      = delete;
+
+  ~PluginRecordView() noexcept;
+
+  PluginRecordView& operator=(const PluginRecordView&) = delete;
+  PluginRecordView& operator=(PluginRecordView&&)      = delete;
+
+  void setup(MOBase::IOrganizer* organizer, TESData::PluginList* pluginList,
+             const QString& pluginName);
+
+  [[nodiscard]] bool hasData() const;
+
+  [[nodiscard]] QSplitter* splitter() const;
+  [[nodiscard]] QTreeView* pickRecordView() const;
+  [[nodiscard]] QTreeView* recordStructureView() const;
+
+  void setFile(const QString& pluginName);
+
+private slots:
+  void onRecordPicked(const QModelIndex& current);
+  void onFileHeaderMoved(int logicalIndex, int oldVisualIndex, int newVisualIndex);
+
+  void on_pickRecordView_expanded(const QModelIndex& index);
+  void on_pickRecordView_customContextMenuRequested(const QPoint& pos);
+  void on_recordStructureView_expanded(const QModelIndex& index);
+  void on_filterCombo_currentIndexChanged(int index);
+  void on_ignoreMasterConflicts_stateChanged(int state);
+
+private:
+  void expandStructureConflicts(const QModelIndex& parent = QModelIndex());
+
+  Ui::PluginRecordView* ui;
+  MOBase::IOrganizer* m_Organizer           = nullptr;
+  const TESData::FileEntry* m_ConflictEntry = nullptr;
+  TESData::PluginList* m_PluginList         = nullptr;
+  PluginRecordModel* m_RecordModel          = nullptr;
+  RecordFilterProxyModel* m_FilterProxy     = nullptr;
+  RecordStructureModel* m_StructureModel    = nullptr;
+  bool m_MovingSection                      = false;
+};
+
+}  // namespace BSPluginInfo
+
+#endif  // BSPLUGININFO_PLUGINRECORDVIEW_H