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, 133 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/TESData/BranchConflictParser.cpp b/libs/installer_bsplugins/src/TESData/BranchConflictParser.cpp
new file mode 100644
index 0000000..7ea33de
--- /dev/null
+++ b/libs/installer_bsplugins/src/TESData/BranchConflictParser.cpp
@@ -0,0 +1,133 @@
+#include "BranchConflictParser.h"
+
+#include <algorithm>
+#include <iterator>
+
+namespace TESData
+{
+
+BranchConflictParser::BranchConflictParser(PluginList* pluginList,
+                                           const std::string& pluginName,
+                                           const RecordPath& path)
+    : m_PluginList{pluginList}, m_PluginName{pluginName}, m_Path{path}
+{}
+
+bool BranchConflictParser::Group(TESFile::GroupData group)
+{
+  if (m_CurrentPath.groups().size() < m_Path.groups().size()) {
+    const auto& lastGroup = m_Path.groups()[m_CurrentPath.groups().size()];
+    if (group.type() != lastGroup.type()) {
+      return false;
+    }
+
+    if (group.hasParent()) {
+      const std::uint8_t localIndex = group.parent() >> 24U;
+      const std::string& owner =
+          localIndex < m_Masters.size() ? m_Masters[localIndex] : m_PluginName;
+
+      if (!TESFile::iequals(owner, m_Path.files()[lastGroup.parent() >> 24])) {
+        return false;
+      }
+    } else if (group != lastGroup) {
+      return false;
+    }
+  } else {
+    if (group.hasParent() && m_Path.hasFormId()) {
+      if ((group.parent() & 0xFFFFFF) != (m_Path.formId() & 0xFFFFFF)) {
+        return false;
+      }
+
+      const std::uint8_t localIndex = group.parent() >> 24U;
+      const std::string& owner =
+          localIndex < m_Masters.size() ? m_Masters[localIndex] : m_PluginName;
+
+      if (!TESFile::iequals(owner.data(), m_Path.files()[m_Path.formId() >> 24])) {
+        return false;
+      }
+    }
+  }
+
+  m_CurrentPath.push(group, m_Masters, m_PluginName);
+  return true;
+}
+
+void BranchConflictParser::EndGroup()
+{
+  m_CurrentPath.pop();
+}
+
+bool BranchConflictParser::Form(TESFile::FormData form)
+{
+  m_CurrentType = form.type();
+
+  if (m_CurrentPath.groups().empty()) {
+    return form.type() == "TES4"_ts;
+  }
+
+  if (m_CurrentPath.groups().size() < m_Path.groups().size()) {
+    return false;
+  } else if (m_CurrentPath.groups().size() == m_Path.groups().size()) {
+    if (m_Path.hasFormId()) {
+      if ((form.formId() & 0xFFFFFF) != (m_Path.formId() & 0xFFFFFF)) {
+        return false;
+      }
+
+      const std::uint8_t localIndex = form.formId() >> 24U;
+      const std::string& owner =
+          localIndex < m_Masters.size() ? m_Masters[localIndex] : m_PluginName;
+
+      if (!TESFile::iequals(owner, m_Path.files()[m_Path.formId() >> 24])) {
+        return false;
+      }
+    }
+  }
+
+  m_CurrentPath.setFormId(form.formId(), m_Masters, m_PluginName);
+
+  const std::uint8_t localModIndex = form.localModIndex();
+  const bool isMasterRecord        = localModIndex < m_Masters.size();
+  return isMasterRecord;
+}
+
+void BranchConflictParser::EndForm()
+{
+  if (m_CurrentType != "TES4"_ts && m_CurrentType != "TES3"_ts) {
+
+    m_PluginList->addRecordConflict(m_PluginName, m_CurrentPath, m_CurrentType,
+                                    m_CurrentName);
+  }
+
+  m_CurrentPath.unsetFormId();
+  m_CurrentType  = {};
+  m_CurrentChunk = {};
+  m_CurrentName.clear();
+}
+
+bool BranchConflictParser::Chunk(TESFile::Type type)
+{
+  m_CurrentChunk = type;
+  if (m_CurrentPath.groups().empty()) {
+    return type == "MAST"_ts;
+  } else {
+    return type == "EDID"_ts;
+  }
+}
+
+void BranchConflictParser::Data(std::istream& stream)
+{
+  switch (m_CurrentChunk) {
+  case "MAST"_ts: {
+    const std::string master = TESFile::readZstring(stream);
+    if (!master.empty()) {
+      m_Masters.push_back(master);
+    }
+  } break;
+
+  case "EDID"_ts: {
+    const std::string editorId = TESFile::readZstring(stream);
+    m_CurrentName              = std::move(editorId);
+  } break;
+  }
+}
+
+}  // namespace TESData