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, 39 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/MOPlugin/BSPlugins.h b/libs/installer_bsplugins/src/MOPlugin/BSPlugins.h
new file mode 100644
index 0000000..81248d7
--- /dev/null
+++ b/libs/installer_bsplugins/src/MOPlugin/BSPlugins.h
@@ -0,0 +1,39 @@
+#ifndef BSPLUGINS_H
+#define BSPLUGINS_H
+
+#include "IPluginPanel.h"
+
+class BSPlugins final : public IPluginPanel
+{
+  Q_OBJECT
+  Q_INTERFACES(MOBase::IPlugin IPluginPanel)
+  Q_PLUGIN_METADATA(IID "org.tannin.BSPlugins" FILE "bsplugins.json")
+
+public:
+  inline static const QString NAME = QStringLiteral("Bethesda Plugin Manager");
+
+  BSPlugins() = default;
+
+  // IPlugin
+
+  QString name() const override;
+  std::vector<std::shared_ptr<const MOBase::IPluginRequirement>>
+  requirements() const override;
+  QString author() const override;
+  QString description() const override;
+  MOBase::VersionInfo version() const override;
+  QList<MOBase::PluginSetting> settings() const override;
+  bool enabledByDefault() const override;
+
+  // IPluginPanel
+
+  bool initPlugin(MOBase::IOrganizer* organizer);
+  QWidget* createWidget(IPanelInterface* panelInterface, QWidget* parent) override;
+  QString label() const override;
+  Position position() const override;
+
+private:
+  MOBase::IOrganizer* m_Organizer;
+};
+
+#endif  // BSPLUGINS_H