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, 53 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/CMakeLists.txt b/libs/installer_bsplugins/CMakeLists.txt
new file mode 100644
index 0000000..b4a8f22
--- /dev/null
+++ b/libs/installer_bsplugins/CMakeLists.txt
@@ -0,0 +1,53 @@
+# modorganizer-bsplugins — vendored from github.com/Exit-9B/modorganizer-bsplugins
+# Branch: update-mob
+# Commit: d52d5d73a591c747962a3a235d4851deb421b009 (2026-04-07)
+#
+# Record-level conflict view for Bethesda plugins (ESP/ESM/ESL).
+# LOOT integration gutted for Fluorine port (sort button + masterlist import
+# + dirty tooltips). Keeps the big feature: form record conflict view.
+
+cmake_minimum_required(VERSION 3.22)
+
+# Compat shim: upstream calls mo2_install_target, fluorine defines mo2_install_plugin.
+if (NOT COMMAND mo2_install_target AND COMMAND mo2_install_plugin)
+    function(mo2_install_target target)
+        mo2_install_plugin(${target})
+    endfunction()
+endif ()
+
+# bsplugins uses unprefixed includes (`<iplugin.h>`, `<gameplugins.h>`, ...).
+# We can't put uibase/include/uibase directly on -I because it contains
+# `strings.h` which shadows libc's POSIX <strings.h> (libc's string.h does
+# `#include <strings.h>`, and gcc picks our -I copy first → pulls in C++ <string>
+# inside an extern "C" block → "template with C linkage" errors everywhere).
+#
+# Fix: build a passthrough include dir with symlinks of every uibase header
+# EXCEPT strings.h. Use the passthrough dir on -I.
+set(_UIBASE_INCLUDE_ROOT "${CMAKE_SOURCE_DIR}/libs/uibase/include/uibase")
+set(BSP_UIBASE_FWD "${CMAKE_CURRENT_BINARY_DIR}/uibase_fwd")
+file(MAKE_DIRECTORY ${BSP_UIBASE_FWD})
+file(MAKE_DIRECTORY ${BSP_UIBASE_FWD}/game_features)
+file(MAKE_DIRECTORY ${BSP_UIBASE_FWD}/formatters)
+file(GLOB _uibase_headers "${_UIBASE_INCLUDE_ROOT}/*.h")
+foreach(h ${_uibase_headers})
+    get_filename_component(_hn ${h} NAME)
+    if(NOT _hn STREQUAL "strings.h")
+        file(CREATE_LINK "${h}" "${BSP_UIBASE_FWD}/${_hn}" SYMBOLIC)
+    endif()
+endforeach()
+file(GLOB _gf_headers "${_UIBASE_INCLUDE_ROOT}/game_features/*.h")
+foreach(h ${_gf_headers})
+    get_filename_component(_hn ${h} NAME)
+    file(CREATE_LINK "${h}" "${BSP_UIBASE_FWD}/game_features/${_hn}" SYMBOLIC)
+    # Also flat at top level — bsplugins mixes `<game_features/foo.h>` and `<foo.h>`.
+    file(CREATE_LINK "${h}" "${BSP_UIBASE_FWD}/${_hn}" SYMBOLIC)
+endforeach()
+# formatters/ subdir (formatters.h uses `#include "./formatters/enums.h"`).
+file(GLOB _fmt_headers "${_UIBASE_INCLUDE_ROOT}/formatters/*.h")
+foreach(h ${_fmt_headers})
+    get_filename_component(_hn ${h} NAME)
+    file(CREATE_LINK "${h}" "${BSP_UIBASE_FWD}/formatters/${_hn}" SYMBOLIC)
+endforeach()
+set(MO2_UIBASE_INCLUDE_DIRS ${BSP_UIBASE_FWD})
+
+add_subdirectory(src)