fix(core): markdown link labels not clickable

[AnatoleLucet]

fixes #869

markdown link labels weren't clickable because treesitter reports concealed highlights instead of markup.link for symbols around the url and label ([...](...)). the detectLinks() fn wasn't taking that into account.

[simonklee]

Can you make this test use the real highlight format tree-sitter returns here? Right now it uses synthetic concealed ranges, but markdown conceal output is conceal with meta.conceal.

[AnatoleLucet]

i think its just conceal without meta. in this case: https://github.com/anomalyco/opentui/blob/main/packages/core/src/lib/tree-sitter/assets/markdown_inline/highlights.scm#L33-L41

but i'll update the tests to use a real treesitter output so we're sure it works and wont break again :)

[AnatoleLucet]

there's a separate issue on main.
one of the test expect string.special.url to be a thing for urls in code comments, but it doesn't really exist. the only instance of this capture i could find is for require imports but that's unrelated.

since this probably never worked, should i remove the test?
or i could add a special case for comment to detect links with a regex or something, but we're probably not allowed (and for good reasons).

i pushed the failing test but the rest is good. let me know how you want to proceed :)

[simonklee]

No, i think the fix was good.

[AnatoleLucet]

there's a separate issue on main.
one of the test expect string.special.url to be a thing for urls in code comments, but it doesn't really exist.

relevant log in ci: https://github.com/anomalyco/opentui/actions/runs/23841810400/job/69500558649?pr=888#step:10:2403