fix: Several fixes for product addition

[g123k]

Hi everyone!

Here are a few fixes for the product addition screen.

From the carousel

The screen was displayed with tabs + non-functioning exit buttons (#5975).

Blocking product selection

The next button was blocked, but the scroll was still possible

Buttons bar in dark mode

Old visual:

Button in dark mode (#5961)

New color:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 6.50%. Comparing base (4d9c7fc) to head (488598c).
Report is 546 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../product/add_new_product/add_new_product_page.dart	0.00%	7 Missing ⚠️
...app/lib/pages/product/product_incomplete_card.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5978      +/-   ##
==========================================
- Coverage     9.54%   6.50%   -3.05%     
==========================================
  Files          325     441     +116     
  Lines        16411   24977    +8566     
==========================================
+ Hits          1567    1624      +57     
- Misses       14844   23353    +8509     

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[teolemon]

Good, those were blockers.