fix: Use <tfoot> for "loading older entries" row

[susnux]

Follow up on #936

As discussed the "loading more entries" / "no more entries" row (the intersection observer) should be on the tfoot for accessibility.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +57.73% 🎉

Comparison is base (a98b582) 42.26% compared to head (2bf3443) 100.00%.

❗ Current head 2bf3443 differs from pull request most recent head a460cc5. Consider uploading reports for the commit a460cc5 to get more accurate results

Additional details and impacted files

@@ Coverage Diff @@## master #948 +/- ##
==============================================
+ Coverage 42.26% 100.00% +57.73% 
==============================================
Files 23 10 -13 Lines 601 168 -433 Branches 31 31 ==============================================
- Hits 254 168 -86 + Misses 347 0 -347 

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[susnux]

/compile amend

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