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, 59 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/GUI/MessageDialog.h b/libs/installer_bsplugins/src/GUI/MessageDialog.h
new file mode 100644
index 0000000..4ea63cb
--- /dev/null
+++ b/libs/installer_bsplugins/src/GUI/MessageDialog.h
@@ -0,0 +1,59 @@
+#ifndef GUI_MESSAGEDIALOG_H
+#define GUI_MESSAGEDIALOG_H
+
+#include <QDialog>
+
+namespace Ui
+{
+class MessageDialog;
+}
+
+namespace GUI
+{
+
+/**
+ * borderless dialog used to display short messages that will automatically
+ * vanish after a moment
+ **/
+class MessageDialog : public QDialog
+{
+  Q_OBJECT
+
+public:
+  /**
+   * @brief constructor
+   *
+   * @param text the message to display
+   * @param reference parent widget. This will also be used to position the message at
+   * the bottom center of the dialog
+   **/
+
+  explicit MessageDialog(const QString& text, QWidget* reference);
+
+  ~MessageDialog();
+
+  /**
+   * factory function for message dialogs. This can be used as a fire-and-forget. The
+   * message will automatically positioned to the reference dialog and get a reasonable
+   * view time
+   *
+   * @param text the text to display. The length of this text is used to determine how
+   * long the dialog is to be shown
+   * @param reference the reference widget on top of which the message should be
+   * displayed
+   * @param true if the message should bring MO to front to ensure this message is
+   * visible
+   **/
+  static void showMessage(const QString& text, QWidget* reference,
+                          bool bringToFront = true);
+
+protected:
+  virtual void resizeEvent(QResizeEvent* event);
+
+private:
+  Ui::MessageDialog* ui;
+};
+
+}  // namespace GUI
+
+#endif  // GUI_MESSAGEDIALOG_H