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, 45 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/GUI/GenericIconDelegate.h b/libs/installer_bsplugins/src/GUI/GenericIconDelegate.h
new file mode 100644
index 0000000..c0d517e
--- /dev/null
+++ b/libs/installer_bsplugins/src/GUI/GenericIconDelegate.h
@@ -0,0 +1,45 @@
+#ifndef GUI_GENERICICONDELEGATE_H
+#define GUI_GENERICICONDELEGATE_H
+
+#include "IconDelegate.h"
+
+namespace GUI
+{
+
+/**
+ * @brief an icon delegate that takes the list of icons from a user-defines data role
+ */
+class GenericIconDelegate : public IconDelegate
+{
+  Q_OBJECT
+public:
+  /**
+   * @brief constructor
+   * @param parent parent object
+   * @param role role of the itemmodel from which the icon list can be queried (as a
+   * QVariantList)
+   * @param logicalIndex logical index within the model. This is part of a "hack".
+   * Normally "empty" icons will be allocated the same space as a regular icon. This way
+   * the model can use empty icons as spacers and thus align same icons horizontally.
+   *                     Now, if you set the logical Index to a valid column and connect
+   * the columnResized slot to the sectionResized signal of the view, the delegate will
+   * turn off this behaviour if the column is smaller than "compactSize"
+   * @param compactSize see explanation of logicalIndex
+   */
+  GenericIconDelegate(QTreeView* parent, int role, int logicalIndex = -1,
+                      int compactSize = 150);
+
+private:
+  [[nodiscard]] QList<QString> getIcons(const QModelIndex& index) const override;
+  [[nodiscard]] int getNumIcons(const QModelIndex& index) const override;
+
+private:
+  int m_Role;
+  int m_LogicalIndex;
+  int m_CompactSize;
+  bool m_Compact;
+};
+
+}  // namespace GUI
+
+#endif  // GUI_GENERICICONDELEGATE_H