fix: Invisible loading animation for pictures

[g123k]

Hi everyone!

There was an issue with the loading animation effect not being visible on images.
It's now fixed + dark mode is fully supported

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 134 lines in your changes missing coverage. Please review.

Project coverage is 6.87%. Comparing base (4d9c7fc) to head (7114689).
Report is 336 commits behind head on develop.

Files with missing lines	Patch %	Lines
...pp/lib/pages/product/common/product_list_page.dart	0.00%	69 Missing ⚠️
.../lib/pages/product/product_image_gallery_view.dart	0.00%	54 Missing ⚠️
...p/lib/generic_lib/widgets/images/smooth_image.dart	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5641      +/-   ##
==========================================
- Coverage     9.54%   6.87%   -2.68%     
==========================================
  Files          325     402      +77     
  Lines        16411   21316    +4905     
==========================================
- Hits          1567    1466     -101     
- Misses       14844   19850    +5006     

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[teolemon]

thx @g123k