feat: Tiny UI tweaks for the product edition

[g123k]

Hi everyone,

I think you know me now, small details aren't that small and I've "pixel-perfected" some screens:

• Photo cropper/viewer: the Edit button is centered on the left

• Photo cropper/viewer: the InkWell takes the full height/width within the border

• Bottom bar buttons (the change will also affect Dialogs): the "negative" action has the same height as the positive one

• Cards to edit values: everything is perfectly aligned (on both sides) + I've removed the Divider (but if you don't like, I can revert this part)

This is brought to you by the only user that will notice the changes 🤪

[codecov-commenter]

Codecov Report

Merging #4456 (f180f85) into develop (6fd6aa8) will increase coverage by 0.03%.
Report is 6 commits behind head on develop.
The diff coverage is 58.82%.

@@             Coverage Diff             @@
##           develop    #4456      +/-   ##
===========================================
+ Coverage    10.26%   10.29%   +0.03%     
===========================================
  Files          296      296              
  Lines        15223    15233      +10     
===========================================
+ Hits          1562     1568       +6     
- Misses       13661    13665       +4     

Files Changed	Coverage Δ
...mooth_app/lib/pages/product/edit_image_button.dart	0.00% <0.00%> (ø)
...ooth_app/lib/pages/product/explanation_widget.dart	0.00% <ø> (ø)
...th_app/lib/pages/product/product_image_viewer.dart	0.00% <0.00%> (ø)
...mooth_app/lib/pages/product/simple_input_page.dart	0.00% <0.00%> (ø)
...app/lib/pages/product/simple_input_text_field.dart	0.00% <0.00%> (ø)
...oth_app/lib/pages/product/simple_input_widget.dart	0.00% <ø> (ø)
packages/smooth_app/lib/themes/theme_provider.dart	40.90% <33.33%> (-1.20%)	⬇️
.../lib/generic_lib/buttons/smooth_simple_button.dart	86.36% <66.66%> (-7.39%)	⬇️
...p/lib/generic_lib/dialogs/smooth_alert_dialog.dart	66.66% <93.75%> (+0.18%)	⬆️

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[teolemon]

I approve, but I really can't spot the difference 🫠

[github-actions]

You can test this PR on: Android