feat: revamp authentication modal with enhanced UI

[cherish2003]

What

• Adds stamp-like animation for the chips
• Optimized text handling for multi-language support
• Prevents unwanted scrolling while maintaining content visibility

Screenshot

Demo

c37311ca47fd46b6bf8488a2b5981d1a.mp4

Fixes bug(s)

• Fixes: Revamp the "user not connected" popup #6456

Part of

• 🎯 What can I work on ? (mobile app) #525

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0.54348% with 183 lines in your changes missing coverage. Please review.

Project coverage is 5.70%. Comparing base (4d9c7fc) to head (d06b437).
Report is 901 commits behind head on develop.

Files with missing lines	Patch %	Lines
...s/user_management/authentication_bottom_sheet.dart	0.54%	182 Missing ⚠️
...pp/lib/pages/product/common/product_refresher.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6488      +/-   ##
==========================================
- Coverage     9.54%   5.70%   -3.85%     
==========================================
  Files          325     511     +186     
  Lines        16411   30590   +14179     
==========================================
+ Hits          1567    1745     +178     
- Misses       14844   28845   +14001     

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[g123k]

Hi @cherish2003!

Thanks for your PR.
Before reviewing your code, please implement the UI as given in the issue.

A non-exhaustive list of issues:

• Wrong text size
• Incorrect buttons (sizes, colors, shadows…)
• Why "for free" in orange?
• Header is too big
• The brown color from the header should go underneath the card
• For buttons : one is green and the other is white with a green border
• For buttons : the animation should be slower. Once a button is not in the foreground, the opacity is reduced

[cherish2003]

@g123k apologies for the list of issues. I have rectified them as per the requirements
attached is the latest UI for your review. Let me know if any further changes are needed. Thank you for your time 🙂

Screenshot

Demo

1ee1aad94fb6432786fcebfab6af0603.mp4

[cherish2003]

@g123k can you kindly review this pr as well and let know any further changes required 🙂

[g123k]

According to your video, there are still some visual issues:

You also have a merge conflict

[g123k]

@cherish2003 Have you seen my feedback?