add wikidot |agohover format tag for DOM compatibility

[jsthope]

Last addition before the compatibility of [[date]] with the Wikijump DOM is complete (WJ-1328).
I've assumed here that for Wikijump, |agohover is ignored because the hover tag is already set to true for it.

[codecov]

Codecov Report

❌ Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.09%. Comparing base (594469e) to head (509e327).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/parsing/rule/impls/block/blocks/date.rs	63.63%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
- Coverage   67.09%   67.09%   -0.01%     
==========================================
  Files         222      222              
  Lines        6570     6588      +18     
==========================================
+ Hits         4408     4420      +12     
- Misses       2162     2168       +6     

Flag	Coverage Δ		*Carryforward flag
ftml	64.55% <ø> (+0.02%)	⬆️	Carriedforward from b7f71dc

*This pull request uses carry forward flags. Click here to find out more.

Files with missing lines	Coverage Δ
src/render/html/element/date.rs	100.00% <100.00%> (ø)
src/parsing/rule/impls/block/blocks/date.rs	75.30% <63.63%> (-2.47%)	⬇️

... and 9 files with indirect coverage changes

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