Fix drawer widget minimized button being unclickable when overlapping with a view

[cmdcolin]

Basically appears to be overridden by the zIndex. Adds an arbitrarily higher number for zIndex. Fixes #2532

[codecov]

Codecov Report

Merging #2533 (7880502) into main (0ad2a3d) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2533      +/-   ##
==========================================
- Coverage   61.10%   61.09%   -0.01%     
==========================================
  Files         543      543              
  Lines       25141    25141              
  Branches     5901     5901              
==========================================
- Hits        15362    15360       -2     
- Misses       9456     9458       +2     
  Partials      323      323              

Impacted Files	Coverage Δ
packages/core/ui/App.tsx	73.68% <ø> (ø)
...inearGenomeView/components/RefNameAutocomplete.tsx	81.39% <0.00%> (-3.49%)	⬇️
packages/core/TextSearch/TextSearchManager.ts	96.55% <0.00%> (-3.45%)	⬇️
...lignments/src/BamAdapter/BamSlightlyLazyFeature.ts	79.24% <0.00%> (+1.88%)	⬆️

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