feat: Tweak the location of the floating messages (ex-Snackbar)

[g123k]

Hi everyone,

While testing the app in the product edition, I noticed that on some screens, having a bottom message feels better.
Feel free to test with Waldo to tell me if it's better now.

[codecov-commenter]

Codecov Report

Merging #4401 (d7a3470) into develop (05850f3) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #4401      +/-   ##
===========================================
- Coverage    10.17%   10.17%   -0.01%     
===========================================
  Files          295      295              
  Lines        15045    15048       +3     
===========================================
  Hits          1531     1531              
- Misses       13514    13517       +3     

Files Changed	Coverage Δ
...ges/smooth_app/lib/background/background_task.dart	0.00% <0.00%> (ø)
...mooth_app/lib/background/background_task_crop.dart	0.00% <0.00%> (ø)
...th_app/lib/background/background_task_details.dart	0.00% <0.00%> (ø)
.../background/background_task_download_products.dart	0.00% <ø> (ø)
...p/lib/background/background_task_full_refresh.dart	0.00% <0.00%> (ø)
...p/lib/background/background_task_hunger_games.dart	0.00% <ø> (ø)
...ooth_app/lib/background/background_task_image.dart	0.00% <0.00%> (ø)
...th_app/lib/background/background_task_offline.dart	0.00% <0.00%> (ø)
.../lib/background/background_task_refresh_later.dart	0.00% <ø> (ø)
...p/lib/background/background_task_top_barcodes.dart	0.00% <ø> (ø)
... and 2 more

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[github-actions]

You can test this PR on: Android