Replace wrestool with native Rust PE icon extraction (pelite)

- Add icons.rs to nak crate: parses PE resource sections, extracts
  RT_GROUP_ICON/RT_ICON and builds ICO files in memory
- Expose nak_extract_exe_icon() FFI for C++ consumption
- Update iconForExecutable() to use Rust FFI instead of shelling out
  to wrestool; reads all ICO entries for correct color depth
- Fix BasicGamePlugin::gameIcon() to call iconForExecutable() (was
  returning empty QIcon, causing placeholder icons for BG3/Cyberpunk)
- Move app icon setup: setDesktopFileName + setWindowIcon to
  MOApplication constructor (fixes Wayland taskbar/decoration icon)
- Move data/com.fluorine.* to data/icons/, install to XDG paths at
  launch for Wayland compositor icon resolution
- Remove icoutils dependency from Docker image and build output

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/data/icons/com.fluorine.manager.desktop b/data/icons/com.fluorine.manager.desktop
new file mode 100644
index 0000000..ff62c76
--- /dev/null
+++ b/data/icons/com.fluorine.manager.desktop
@@ -0,0 +1,22 @@
+[Desktop Entry]
+Type=Application
+Name=Fluorine Manager
+GenericName=Mod Manager
+Comment=Mod Organizer 2 for Linux - manage your game mods
+Exec=fluorine-manager
+Icon=com.fluorine.manager
+Terminal=false
+Categories=Game;Utility;
+Keywords=mod;organizer;modding;skyrim;fallout;
+MimeType=x-scheme-handler/nxm;
+Actions=create-portable;list-instances;
+
+[Desktop Action create-portable]
+Name=Create Portable Instance
+Exec=fluorine-manager create-portable
+Icon=com.fluorine.manager
+
+[Desktop Action list-instances]
+Name=List Instances
+Exec=fluorine-manager list-instances
+Icon=com.fluorine.manager