feat: allow undefined for useHydrate

[jason89521]

Proposed change

close #146

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Testing
• Refactor
• Chore (tool changes, configuration changes, and changes to things that do not actually go into production at all)

Implementation

Related Issue

[codecov]

Codecov Report

Merging #164 (6379b41) into main (328e697) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
- Coverage   97.83%   97.83%   -0.01%     
==========================================
  Files          31       31              
  Lines        1941     1940       -1     
  Branches      293      294       +1     
==========================================
- Hits         1899     1898       -1     
  Misses         42       42              

Impacted Files	Coverage Δ
src/lib/hooks/useHydrate.ts	100.00% <100.00%> (ø)
src/lib/model/Model.ts	98.25% <100.00%> (-0.02%)	⬇️

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