fix(feedback): improve ESOURCE link parsing

[thostetler]

The feedback page's URL list (via useGetResourceLinks) was scraping
footer links from the link_gateway ESOURCE page on 404 responses, and
the redirect detection was non-functional.

• Add res.ok guard to return empty on non-2xx responses (404 was leaking footer links into the URL list)
• Replace dead res.status === 302 check with res.redirected detection (browser fetch auto-follows redirects, so the old check never fired)
• Replace page-wide href regex with DOMParser scoped to .list-group-item a elements
• Remove brittle SKIP_URLS blocklist and URL_REGX regex (no longer needed with scoped parsing)

For testing: https://scixplorer.org/abs/1986JAVSO..15..282W/abstract

[codecov]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.9%. Comparing base (d131c2d) to head (0239af2).

Files with missing lines	Patch %	Lines
src/lib/useGetResourceLinks.ts	87.0%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #806     +/-   ##
========================================
- Coverage    62.0%   61.9%   -0.0%     
========================================
  Files         315     315             
  Lines       36392   36391      -1     
  Branches     1631    1632      +1     
========================================
- Hits        22537   22526     -11     
- Misses      13818   13828     +10     
  Partials       37      37             

Files with missing lines	Coverage Δ
src/lib/useGetResourceLinks.ts	92.2% <87.0%> (-2.3%)	⬇️

... and 4 files with indirect coverage changes

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