feat: UI improvements for the "Add to list" modal sheet

[g123k]

Hi everyone!

I was not satisfied with the current modal and there are many changes.

🎥 Here's a video : https://github.com/user-attachments/assets/641bb36d-159c-49d0-b2fa-10b1e7a044eb

• Items are a bit taller (+ 10 pixels) and they have a dashed divider

• The Scrollbar is forced when there is something to scroll

• The button to add a New list is at the bottom

• The "OK" button is always clickable (but will flash red if there's already a list with this name)

• There are tooltips on buttons

And the same with the dark mode:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 175 lines in your changes missing coverage. Please review.

Project coverage is 7.05%. Comparing base (4d9c7fc) to head (056a0e8). Report is 434 commits behind head on develop.

Files with missing lines	Patch %	Lines
...oth_app/lib/pages/product/product_list_helper.dart	0.00%	129 Missing :warning:
...b/bottom_sheets/smooth_draggable_bottom_sheet.dart	0.00%	33 Missing :warning:
packages/smooth_app/lib/resources/app_icons.dart	0.00%	11 Missing :warning:
...om_sheets/smooth_draggable_bottom_sheet_route.dart	0.00%	1 Missing :warning:
...pages/product/product_page/new_product_footer.dart	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #5804 +/- ## ========================================== - Coverage 9.54% 7.05% -2.50% ========================================== Files 325 411 +86 Lines 16411 22318 +5907 ========================================== + Hits 1567 1574 +7 - Misses 14844 20744 +5900 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.