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, 79 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/MOPlugin/BSPlugins.cpp b/libs/installer_bsplugins/src/MOPlugin/BSPlugins.cpp
new file mode 100644
index 0000000..442fbcf
--- /dev/null
+++ b/libs/installer_bsplugins/src/MOPlugin/BSPlugins.cpp
@@ -0,0 +1,79 @@
+#include "BSPlugins.h"
+
+#include "BSPluginList/PluginsWidget.h"
+#include "Settings.h"
+
+using namespace Qt::Literals::StringLiterals;
+
+bool BSPlugins::initPlugin(MOBase::IOrganizer* organizer)
+{
+  m_Organizer = organizer;
+  Settings::init(organizer);
+  return true;
+}
+
+QString BSPlugins::name() const
+{
+  return NAME;
+}
+
+std::vector<std::shared_ptr<const MOBase::IPluginRequirement>>
+BSPlugins::requirements() const
+{
+  return {Requirements::gameDependency(
+      {u"Oblivion"_s, u"Fallout 3"_s, u"New Vegas"_s, u"Skyrim"_s, u"Enderal"_s,
+       u"Fallout 4"_s, u"Skyrim Special Edition"_s, u"Enderal Special Edition"_s,
+       u"Skyrim VR"_s, u"Fallout 4 VR"_s, u"Starfield"_s, u"Oblivion Remastered"_s})};
+}
+
+QString BSPlugins::author() const
+{
+  return u"Parapets"_s;
+}
+
+QString BSPlugins::description() const
+{
+  return tr("Manages plugin load order for BGS game engines");
+}
+
+MOBase::VersionInfo BSPlugins::version() const
+{
+  return MOBase::VersionInfo(0, 1, 5, 0, MOBase::VersionInfo::RELEASE_BETA);
+}
+
+QList<MOBase::PluginSetting> BSPlugins::settings() const
+{
+  return {
+      {u"enable_sort_button"_s, u"Enable the Sort button in the Plugins panel"_s, false},
+      {u"external_change_warning"_s,
+       u"Warn if load order changes while running an executable"_s, true},
+      {u"loot_show_dirty"_s,
+       u"LOOT: Show information about plugins that can be cleaned"_s, true},
+      {u"loot_show_messages"_s,
+       u"LOOT: Show general information and warning messages"_s, true},
+      {u"loot_show_problems"_s,
+       u"LOOT: Show information about incompatibilities and missing masters"_s, true},
+  };
+}
+
+bool BSPlugins::enabledByDefault() const
+{
+  return false;
+}
+
+QWidget* BSPlugins::createWidget(IPanelInterface* panelInterface, QWidget* parent)
+{
+  const auto widget =
+      new BSPluginList::PluginsWidget(m_Organizer, panelInterface, parent);
+  return widget;
+}
+
+QString BSPlugins::label() const
+{
+  return tr("Plugins");
+}
+
+IPluginPanel::Position BSPlugins::position() const
+{
+  return Position::inPlaceOf(u"espTab"_s);
+}