Fix R CMD check warnings, documentation links, and reduce package size

[DanielGarbozo]

This PR addresses several issues found during devtools::check() to ensure the package passes all checks without errors, warnings, or notes.

Changes made:

• Dependencies: Added cluster to Imports in the DESCRIPTION file to fix the missing namespace error.
• Documentation: Fixed broken cross-reference links in view_net.R (linked correctly to build_net).
• Data Size: Applied xz compression (level 9) to the data/ directory. This reduced the installed package size to <5MB, resolving the package size NOTE.
• Docs: Regenerated documentation with roxygen2.

Result:
devtools::check() now passes with 0 errors, 0 warnings, and 0 notes (ignoring Windows-specific Quarto env var errors).