Fix DDS and winreg missing in Python plugins

- Stage DDS/ package from source directly to plugins/data/DDS/ in
  build-inner.sh (cmake MO2_STAGE_PYTHON_PLUGIN_PAYLOAD is OFF by
  default so the cmake-sourced path was silently skipped)
- Stage winreg.py from libs/ directly as well (same root cause)
- Guard `import winreg` in gog_utils.py with try/except ImportError
  and early-exit to Heroic GOG path if the shim is unavailable

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

2 files changed, 17 insertions, 3 deletions

diff --git a/docker/build-inner.sh b/docker/build-inner.sh
index 3290069..66dadf6 100755
--- a/docker/build-inner.sh
+++ b/docker/build-inner.sh
@@ -78,8 +78,9 @@ if [ -d "build/src/src/plugins/libs" ]; then
     mkdir -p "${OUT_DIR}/plugins/libs"
     cp -f build/src/src/plugins/libs/mobase*.so "${OUT_DIR}/plugins/libs/" 2>/dev/null || true
 fi
-# Python helper shims
+# Python helper shims — copy from source directly (cmake staging is OFF by default)
 for f in lzokay.py winreg.py pyCfg.py; do
+    [ -f "libs/${f}" ] && cp -f "libs/${f}" "${OUT_DIR}/plugins/"
     [ -f "build/src/src/plugins/${f}" ] && cp -f "build/src/src/plugins/${f}" "${OUT_DIR}/plugins/"
 done
 
@@ -103,7 +104,12 @@ if [ -d "libs/basic_games" ]; then
         -o -name "CMakeLists.txt" -o -name "CMakePresets.json" \) \
         -delete 2>/dev/null || true
 fi
-# data/ dir (DDS headers etc., used by native plugins too).
+# data/ dir (DDS headers etc., used by DDSPreview.py via plugins/data/ in sys.path).
+# Stage DDS package from source directly (cmake staging is OFF by default).
+if [ -d "libs/preview_dds/src/DDS" ]; then
+    mkdir -p "${OUT_DIR}/plugins/data"
+    cp -a "libs/preview_dds/src/DDS" "${OUT_DIR}/plugins/data/DDS"
+fi
 [ -d "build/src/src/plugins/data" ] && cp -a "build/src/src/plugins/data" "${OUT_DIR}/plugins/"
 
 # ── Stylesheets (themes) ──
diff --git a/libs/basic_games/gog_utils.py b/libs/basic_games/gog_utils.py
index de66ec2..750f739 100644
--- a/libs/basic_games/gog_utils.py
+++ b/libs/basic_games/gog_utils.py
@@ -5,9 +5,13 @@ from __future__ import annotations
 
 import json
 import sys
-import winreg
 from pathlib import Path
 
+try:
+    import winreg
+except ImportError:
+    winreg = None  # type: ignore[assignment]
+
 
 def _find_heroic_gog_games() -> dict[str, Path]:
     """Detect GOG games installed via Heroic Launcher on Linux."""
@@ -44,6 +48,10 @@ def _find_heroic_gog_games() -> dict[str, Path]:
 
 
 def find_games() -> dict[str, Path]:
+    if winreg is None:
+        # winreg not available (Linux without shim); use Heroic GOG.
+        return _find_heroic_gog_games()
+
     # List the game IDs from the registry (Windows):
     game_ids: list[str] = []
     try: