build(manifest): Ensure Skia's src files and public headers are correctly installed

com.aseprite.Aseprite.yaml

@@ -106,17 +106,25 @@ modules:
       - install -d /app/lib
       - install -d /app/include # Changed from /app/include/skia
       - install -d /app/third_party/externals
+      # Ensure /app/src exists for Skia's src files
+      - install -d /app/src
       
       # Install Skia library
       - install -m644 out/Release-x64/libskia.a /app/lib/libskia.a
       
-      # Copy headers
-      - cp -r include/* /app/include/ # Changed from /app/include/skia/
+      # Copy Skia's public headers from 'include/' to '/app/include/'
+      - cp -r include/* /app/include/
       
-      # Copy Skia's internal 'modules' headers as they are referenced by public headers
+      # Copy Skia's 'modules' directory to '/app/include/modules/'
+      # (as public headers might reference them like "modules/skcms/skcms.h")
       - echo "Copying Skia 'modules' directory to /app/include/"
       - cp -r modules /app/include/
       
+      # Copy Skia's internal 'src' directory to '/app/src/'
+      # (as Aseprite/LAF references them like "src/core/SkConvertPixels.h")
+      - echo "Copying Skia 'src' directory to /app/"
+      - cp -r src/* /app/src/
+      
       # Extract and install libraries that Aseprite needs
       - |
         echo "Extracting and installing bundled libraries..."