fix: properly handle search within a single entry

[KaneFreeman]

Resolves #853

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[codecov]

Codecov Report

Merging #855 (0257368) into main (9854afe) will increase coverage by 0.12%.
The diff coverage is 69.84%.

@@            Coverage Diff             @@
##             main     #855      +/-   ##
==========================================
+ Coverage   50.88%   51.01%   +0.12%     
==========================================
  Files         218      219       +1     
  Lines        9458     9507      +49     
  Branches     2533     2549      +16     
==========================================
+ Hits         4813     4850      +37     
- Misses       4263     4277      +14     
+ Partials      382      380       -2     

Files Changed	Coverage Δ
packages/core/src/backend.ts	12.70% <14.28%> (+0.02%)	⬆️
packages/core/src/lib/util/search.util.ts	76.74% <76.74%> (ø)
...ages/core/src/widgets/relation/RelationControl.tsx	90.80% <76.92%> (-1.42%)	⬇️