A plain `cargo build --release` at the workspace root builds only the app
package and its dependencies, so it never emitted the artifacts the
packaging steps consume:
* libdwg_thumbnailer.a — the staticlib crate-type is produced only when
dwg-thumbnailer is built as a target (as a dependency cargo makes just
the rlib); the macOS QuickLook .appex links this static lib.
* dwg_thumbnailer_win.dll — dwg-thumbnailer-win is a workspace member,
not an app dependency, so the DLL the WiX MSI references was missing.
Build each helper crate explicitly on its platform, and link the extra
system libraries (Security/SystemConfiguration/iconv) the Rust staticlib
pulls in against the QuickLook extension.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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