Function compile_frontend_from_rir_with_file_paths 

pub fn compile_frontend_from_rir_with_file_paths(
    rir: Rir,
    interner: ThreadedRodeo,
    preview_features: &PreviewFeatures,
    file_paths: HashMap<FileId, String>,
) -> MultiErrorResult<CompileStateFromRir>

Compile frontend from RIR with file paths for module resolution.

This is the full version that accepts file_id -> path mapping for multi-file compilation with module imports.