Keep the pixel values as floating point numbers in Treemap

[kitsuyui]

Problem

• Currently the pixel values in the Treemap component are rounded to integers.
• This causes gaps in the display when the pixel values are not rounded.

Solution

• Keep the pixel values as floating point numbers in the Treemap component.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.02%. Comparing base (f28f36e) to head (8a807f1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #649   +/-   ##
=======================================
  Coverage   70.02%   70.02%           
=======================================
  Files          48       48           
  Lines        1715     1715           
  Branches      311      311           
=======================================
  Hits         1201     1201           
  Misses        514      514           

Flag	Coverage Δ
unittests	70.02% <ø> (ø)

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