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, 67 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESFile/Reader.h b/libs/installer_bsplugins/src/TESFile/Reader.h
new file mode 100644
index 0000000..0479842
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESFile/Reader.h
@@ -0,0 +1,67 @@
+#ifndef TESFILE_READER_H
+#define TESFILE_READER_H
+
+#include "Stream.h"
+
+#include <concepts>
+#include <cstdint>
+#include <filesystem>
+#include <istream>
+#include <utility>
+
+namespace TESFile
+{
+
+template <typename Handler>
+concept ReaderHandler = requires(Handler& handler) {
+  {
+    handler.Group(std::declval<GroupData>())
+  } -> std::convertible_to<bool>;
+  {
+    handler.Form(std::declval<FormData>())
+  } -> std::convertible_to<bool>;
+  {
+    handler.Chunk(std::declval<Type>())
+  } -> std::convertible_to<bool>;
+  {
+    handler.Data(std::declval<std::istream&>())
+  };
+};
+
+template <ReaderHandler Handler>
+class Reader
+{
+public:
+  void parse(const std::filesystem::path& path, Handler& handler);
+
+  void parse(std::istream& stream, Handler& handler);
+
+private:
+  enum HeaderSize
+  {
+    HeaderSize_Standard  = sizeof(RecordHeader),
+    HeaderSize_Oblivion  = 20,
+    HeaderSize_Morrowind = 16,
+  };
+
+  std::uint32_t parsePluginInfo(std::istream& stream, Handler& handler);
+
+  std::uint32_t parseRecord(std::istream& stream, Handler& handler);
+
+  std::uint32_t handleForm(std::istream& stream, const RecordHeader& header,
+                           Handler& handler);
+
+  std::uint32_t handleGroup(std::istream& stream, const RecordHeader& header,
+                            Handler& handler);
+
+  std::uint32_t parseChunk(std::istream& stream, Handler& handler);
+
+  TESFormat chunkFormat_;
+  int headerSize_;
+};
+
+}  // namespace TESFile
+
+#include "Reader.inl"
+
+#endif  // TESFILE_READER_H