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, 153 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/BSPluginInfo/AuxConflictModel.cpp b/libs/installer_bsplugins/src/BSPluginInfo/AuxConflictModel.cpp
new file mode 100644
index 0000000..bd93000
--- /dev/null
+++ b/libs/installer_bsplugins/src/BSPluginInfo/AuxConflictModel.cpp
@@ -0,0 +1,153 @@
+#include "AuxConflictModel.h"
+
+#include <utility>
+
+namespace BSPluginInfo
+{
+
+AuxConflictModel::AuxConflictModel(const TESData::PluginList* pluginList,
+                                   QObject* parent)
+    : QAbstractItemModel(parent), m_PluginList{pluginList}
+{}
+
+void AuxConflictModel::appendItem(const QString& name,
+                                  QList<TESData::TESFileHandle>&& handles)
+{
+  m_Items.append({name, std::move(handles)});
+}
+
+QModelIndex AuxConflictModel::index(int row, int column,
+                                    const QModelIndex& parent) const
+{
+  if (parent.isValid()) {
+    return QModelIndex();
+  }
+
+  return createIndex(row, column, row);
+}
+
+QModelIndex AuxConflictModel::parent([[maybe_unused]] const QModelIndex& index) const
+{
+  return QModelIndex();
+}
+
+int AuxConflictModel::rowCount(const QModelIndex& parent) const
+{
+  return !parent.isValid() ? m_Items.length() : 0;
+}
+
+int AuxWinnerModel::columnCount([[maybe_unused]] const QModelIndex& parent) const
+{
+  return COL_COUNT;
+}
+
+int AuxLoserModel::columnCount([[maybe_unused]] const QModelIndex& parent) const
+{
+  return COL_COUNT;
+}
+
+int AuxNonConflictModel::columnCount([[maybe_unused]] const QModelIndex& parent) const
+{
+  return COL_COUNT;
+}
+
+QVariant AuxWinnerModel::data(const QModelIndex& index, int role) const
+{
+  if (role == Qt::DisplayRole) {
+    switch (index.column()) {
+    case COL_NAME:
+      return m_Items[index.row()].name;
+    case COL_LOSERS: {
+      QStringList names;
+      const auto& handles = m_Items[index.row()].sortedHandles;
+      for (int i = 0, count = handles.length() - 1; i < count; ++i) {
+        const auto handle = handles[i];
+        const auto entry  = m_PluginList->findEntryByHandle(handle);
+        if (entry) {
+          names.append(QString::fromStdString(entry->name()));
+        }
+      }
+      return names.join(QStringLiteral(", "));
+    }
+    }
+  }
+  return QVariant();
+}
+
+QVariant AuxLoserModel::data(const QModelIndex& index, int role) const
+{
+  if (role == Qt::DisplayRole) {
+    switch (index.column()) {
+    case COL_NAME:
+      return m_Items[index.row()].name;
+    case COL_WINNER: {
+      const auto& handles = m_Items[index.row()].sortedHandles;
+      const auto entry    = m_PluginList->findEntryByHandle(handles.last());
+      return entry ? QString::fromStdString(entry->name()) : QString();
+    }
+    }
+  }
+  return QVariant();
+}
+
+QVariant AuxNonConflictModel::data(const QModelIndex& index, int role) const
+{
+  if (role == Qt::DisplayRole) {
+    switch (index.column()) {
+    case COL_NAME:
+      return m_Items[index.row()].name;
+    }
+  }
+  return QVariant();
+}
+
+QVariant AuxWinnerModel::headerData(int section, Qt::Orientation orientation,
+                                    int role) const
+{
+  if (orientation != Qt::Horizontal || role != Qt::DisplayRole) {
+    return QVariant();
+  }
+
+  switch (section) {
+  case COL_NAME:
+    return tr("File");
+  case COL_LOSERS:
+    return tr("Overwritten Mods");
+  default:
+    return QVariant();
+  }
+}
+
+QVariant AuxLoserModel::headerData(int section, Qt::Orientation orientation,
+                                   int role) const
+{
+  if (orientation != Qt::Horizontal || role != Qt::DisplayRole) {
+    return QVariant();
+  }
+
+  switch (section) {
+  case COL_NAME:
+    return tr("File");
+  case COL_WINNER:
+    return tr("Providing Mod");
+  default:
+    return QVariant();
+  }
+}
+
+QVariant AuxNonConflictModel::headerData(int section, Qt::Orientation orientation,
+                                         int role) const
+{
+  if (orientation != Qt::Horizontal || role != Qt::DisplayRole) {
+    return QVariant();
+  }
+
+  switch (section) {
+  case COL_NAME:
+    return tr("File");
+  default:
+    return QVariant();
+  }
+}
+
+}  // namespace BSPluginInfo