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, 279 insertions, 0 deletions

diff --git a/libs/installer_bsplugins/src/BSPluginList/pluginswidget.ui b/libs/installer_bsplugins/src/BSPluginList/pluginswidget.ui
new file mode 100644
index 0000000..ea87e57
--- /dev/null
+++ b/libs/installer_bsplugins/src/BSPluginList/pluginswidget.ui
@@ -0,0 +1,279 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>PluginsWidget</class>
+ <widget class="QWidget" name="PluginsWidget">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>313</width>
+    <height>332</height>
+   </rect>
+  </property>
+  <property name="sizePolicy">
+   <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+    <horstretch>0</horstretch>
+    <verstretch>0</verstretch>
+   </sizepolicy>
+  </property>
+  <property name="windowTitle">
+   <string>Plugins</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <property name="spacing">
+    <number>2</number>
+   </property>
+   <property name="topMargin">
+    <number>6</number>
+   </property>
+   <property name="bottomMargin">
+    <number>0</number>
+   </property>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <property name="spacing">
+      <number>6</number>
+     </property>
+     <item>
+      <widget class="QPushButton" name="sortButton">
+       <property name="toolTip">
+        <string>Sort the plugins using LOOT.</string>
+       </property>
+       <property name="whatsThis">
+        <string>Sort the plugins using LOOT.</string>
+       </property>
+       <property name="text">
+        <string>Sort</string>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../modorganizer/src/resources.qrc">
+         <normaloff>:/MO/gui/sort</normaloff>:/MO/gui/sort</iconset>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="listOptionsBtn">
+       <property name="maximumSize">
+        <size>
+         <width>16777215</width>
+         <height>16777215</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Open list options...</string>
+       </property>
+       <property name="whatsThis">
+        <string>Refresh list. This is usually not necessary unless you modified data outside the program.</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../modorganizer/src/resources.qrc">
+         <normaloff>:/MO/gui/settings</normaloff>:/MO/gui/settings</iconset>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="restoreButton">
+       <property name="toolTip">
+        <string>Restore a backup.</string>
+       </property>
+       <property name="whatsThis">
+        <string>Restore a backup.</string>
+       </property>
+       <property name="text">
+        <string notr="true"/>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../modorganizer/src/resources.qrc">
+         <normaloff>:/MO/gui/restore</normaloff>:/MO/gui/restore</iconset>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="saveButton">
+       <property name="toolTip">
+        <string>Create a backup.</string>
+       </property>
+       <property name="whatsThis">
+        <string>Create a backup.</string>
+       </property>
+       <property name="text">
+        <string notr="true"/>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../modorganizer/src/resources.qrc">
+         <normaloff>:/MO/gui/backup</normaloff>:/MO/gui/backup</iconset>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="activePluginsLabel">
+       <property name="text">
+        <string>Active:</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLCDNumber" name="activePluginsCounter">
+       <property name="minimumSize">
+        <size>
+         <width>0</width>
+         <height>26</height>
+        </size>
+       </property>
+       <property name="whatsThis">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;This provides statistics about the plugin list. The total number of active plugins is normally displayed.  Other statistics may be accessed with the tooltip of this counter.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+       <property name="frameShadow">
+        <enum>QFrame::Sunken</enum>
+       </property>
+       <property name="digitCount">
+        <number>4</number>
+       </property>
+       <property name="segmentStyle">
+        <enum>QLCDNumber::Flat</enum>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="BSPluginList::PluginListView" name="pluginList">
+     <property name="minimumSize">
+      <size>
+       <width>250</width>
+       <height>250</height>
+      </size>
+     </property>
+     <property name="contextMenuPolicy">
+      <enum>Qt::CustomContextMenu</enum>
+     </property>
+     <property name="toolTip">
+      <string>List of available esp/esm files.</string>
+     </property>
+     <property name="whatsThis">
+      <string>List of available esp/esm files.</string>
+     </property>
+     <property name="editTriggers">
+      <set>QAbstractItemView::EditKeyPressed|QAbstractItemView::SelectedClicked</set>
+     </property>
+     <property name="dragEnabled">
+      <bool>true</bool>
+     </property>
+     <property name="dragDropOverwriteMode">
+      <bool>false</bool>
+     </property>
+     <property name="dragDropMode">
+      <enum>QAbstractItemView::InternalMove</enum>
+     </property>
+     <property name="defaultDropAction">
+      <enum>Qt::MoveAction</enum>
+     </property>
+     <property name="alternatingRowColors">
+      <bool>true</bool>
+     </property>
+     <property name="selectionMode">
+      <enum>QAbstractItemView::ExtendedSelection</enum>
+     </property>
+     <property name="selectionBehavior">
+      <enum>QAbstractItemView::SelectRows</enum>
+     </property>
+     <property name="indentation">
+      <number>20</number>
+     </property>
+     <property name="uniformRowHeights">
+      <bool>true</bool>
+     </property>
+     <property name="itemsExpandable">
+      <bool>true</bool>
+     </property>
+     <property name="sortingEnabled">
+      <bool>true</bool>
+     </property>
+     <property name="expandsOnDoubleClick">
+      <bool>false</bool>
+     </property>
+     <attribute name="headerStretchLastSection">
+      <bool>false</bool>
+     </attribute>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <spacer name="horizontalSpacer_2">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="MOBase::LineEditClear" name="espFilterEdit">
+       <property name="toolTip">
+        <string>Filter the list of plugins.</string>
+       </property>
+       <property name="whatsThis">
+        <string>Filter the list of plugins.</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="placeholderText">
+        <string>Filter</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <customwidgets>
+  <customwidget>
+   <class>MOBase::LineEditClear</class>
+   <extends>QLineEdit</extends>
+   <header>lineeditclear.h</header>
+  </customwidget>
+  <customwidget>
+   <class>BSPluginList::PluginListView</class>
+   <extends>QTreeView</extends>
+   <header>BSPluginList/PluginListView.h</header>
+  </customwidget>
+ </customwidgets>
+ <resources>
+  <include location="../../../modorganizer/src/resources.qrc"/>
+ </resources>
+ <connections/>
+</ui>