Get all Mendeley Data links: real hyperlinks from the paper's own url
table, plus a body-text fallback for a BARE mention (a DOI like
"10.17632/vjtxybrc28.1" is routinely cited without any URL scheme at all)
that the source PDF/HTML never encoded as an actual hyperlink – the url
table only ever contains links the source document itself made clickable.
Same two-tier approach zenodo_links() uses.
Examples
paper <- demopaper()
mendeley_links(paper)
#> # A tibble: 0 × 7
#> # ℹ 7 variables: href <chr>, link_text <chr>, text_id <int>, paper_id <chr>,
#> # mendeley_url <chr>, mendeley_id <chr>, mendeley_link <lgl>