Fix findLinkFromClickTarget for SVG elements (fixes #1510)

[Danish-Belal]

SVGAElement exposes href as SVGAnimatedString which does not implement startsWith(). Use getAttribute('href') which returns a string for both HTMLAnchorElement and SVGAElement.

Add tests for clicking SVG links (same-origin and hash-only).

[Samuel-Labagnere]

Great PR overall, lgtm. 👍🏻
Just added a few comments towards harmonizing your texts with how things are written elsewhere in the project.

[Danish-Belal]

Thanks for the review, @Samuel-Labagnere . I’ve addressed all your feedback:

1. getLinkHrefString comment (util.js)
   Updated the JSDoc to cover both element types and the difference between .href and getAttribute("href"):

2. Navigation tests

Renamed "clicking a same-origin link inside an SVG element" → "following a same-origin SVG link"
Renamed "clicking an SVG link with hash-only href scrolls to anchor without a visit" → "following a same-origin SVG anchored link"
Renamed fixture link id from #svg-hash-link to #same-origin-anchored-svg-link
Simplified the SVG anchored link test to follow the same pattern as "following a same-origin anchored link"
3. Prefetch test
Renamed "it doesn't prefetch when hovering SVG link with hash href" → "it doesn't prefetch the page when SVG link has a hash as a href" to match the test above.

All changes are pushed. Please let me know if anything else needs adjustment.

[Danish-Belal]

@Samuel-Labagnere Looking forward you to review and getting merge my PR.
Thank you.

[Samuel-Labagnere]

@Danish-Belal So far so good to me, now it's in the maintainers hands.

[Danish-Belal]

@packagethief
Looking forward for your action