fix: 5627 - remove focus from price amount after adding product

[monsieurtanuki]

What

• When adding a price product, the price amount was potentially still focused on, causing amounts to be typed in in the wrong amount field.
• Now when we add a price product, we lose the focus on the previous amount field: no confusion is possible now.

Fixes bug(s)

• Fixes: Focus remains on the previous price on receipt addition #5627

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 6.94%. Comparing base (4d9c7fc) to head (6a99bf4).
Report is 382 commits behind head on develop.

Files with missing lines	Patch %	Lines
...h_app/lib/pages/prices/price_add_product_card.dart	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5729      +/-   ##
==========================================
- Coverage     9.54%   6.94%   -2.61%     
==========================================
  Files          325     404      +79     
  Lines        16411   21622    +5211     
==========================================
- Hits          1567    1502      -65     
- Misses       14844   20120    +5276     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[teolemon]

Great, that was annoying me when adding prices. If I understand well, we unfocus, but don't focus on the next price ?

[monsieurtanuki]

Thank you @teolemon for your review!

Great, that was annoying me when adding prices. If I understand well, we unfocus, but don't focus on the next price ?

That's correct.
My goal here was to fix the bug.
There could be a more refined focus management, but between the focus and the keyboard there are some nuances in flutter I hadn't time to delve into.
Besides, that page is already tagged as confusing (#5632), therefore I guess a whole page UX refactoring would be appropriate, with explicit requirements including focus management.