feat: If camera permission is denied, allow the user to approve it again

[g123k]

• Support for rationale (Android)
• If the permission is denied, no barcode decoder is launched
• When the app is resumed, check if the permission is still available
• Value saved on user preferences was totally useless, since Android/iOS provide the same info

Camera.mp4

Fix #1564

[codecov-commenter]

Codecov Report

Merging #1583 (f763eb1) into develop (2ea0da3) will decrease coverage by 0.01%.
The diff coverage is 2.89%.

@@            Coverage Diff             @@
##           develop   #1583      +/-   ##
==========================================
- Coverage     8.86%   8.84%   -0.02%     
==========================================
  Files          161     162       +1     
  Lines         6623    6693      +70     
==========================================
+ Hits           587     592       +5     
- Misses        6036    6101      +65     

Impacted Files	Coverage Δ
...s/smooth_app/lib/data_models/user_preferences.dart	34.42% <ø> (+2.11%)	⬆️
...mooth_app/lib/generic_lib/widgets/smooth_card.dart	0.00% <ø> (ø)
...oth_app/lib/pages/onboarding/country_selector.dart	0.00% <0.00%> (ø)
...ges/smooth_app/lib/pages/product/summary_card.dart	0.00% <0.00%> (ø)
...es/smooth_app/lib/pages/scan/ml_kit_scan_page.dart	0.96% <0.00%> (ø)
...mooth_app/lib/widgets/smooth_product_carousel.dart	0.00% <ø> (ø)
...ages/smooth_app/lib/helpers/permission_helper.dart	3.22% <3.22%> (ø)
packages/smooth_app/lib/pages/scan/scan_page.dart	4.10% <3.38%> (+1.60%)	⬆️
...ges/smooth_app/lib/pages/scan/scanner_overlay.dart	5.71% <5.88%> (+5.71%)	⬆️

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[teolemon]

Perhaps a slight visual tweak

[g123k]

Is-it better like so @teolemon?

[teolemon]

👍

[M123-dev]

Just one thing, as far as I know opening the settings for manual permission approval isn't supported on iOS

[g123k]

@M123-dev Don't worry, it works well on iOS

RPReplay_Final1650125230.MP4

[M123-dev]

Perfect @g123k this simplifies everything. A older version had this in the docs:

[...] The user may still change the permission status in the settings. Only supported on Android.

[g123k]

Actually that’s also the case in iOS.
But even when the user changes the permission outside the app, the popup will still be correctly displayed when needed