feat: Brands edition in a list + reorderable items

[g123k]

Hi everyone!

This PR will finally resolve the issue with autocompletion on multiple brands.
The brands are displayed in a list and are even reorderable.

Video:

ScreenRecording_01-09-2025.20-39-24_1.MP4

New feature when editing

For all fields, adding an existing value will display an error VS nothing before

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 141 lines in your changes missing coverage. Please review.

Project coverage is 6.32%. Comparing base (4d9c7fc) to head (9c62964).
Report is 630 commits behind head on develop.

Files with missing lines	Patch %	Lines
...oth_app/lib/pages/product/simple_input_widget.dart	0.00%	67 Missing ⚠️
...p/lib/pages/product/simple_input_page_helpers.dart	0.00%	44 Missing ⚠️
..._app/lib/pages/product/add_basic_details_page.dart	0.00%	18 Missing ⚠️
...app/lib/pages/product/simple_input_text_field.dart	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6167      +/-   ##
==========================================
- Coverage     9.54%   6.32%   -3.23%     
==========================================
  Files          325     451     +126     
  Lines        16411   26014    +9603     
==========================================
+ Hits          1567    1645      +78     
- Misses       14844   24369    +9525     

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