chore: [IOBP-2074,IOBP-2070] Adjust bonus screen copy and cosmetics changes

[LeleDallas]

Short description

This pull request introduces several UI improvements and refactors to enhance consistency, clarity, and user experience across the bonus and IDPay onboarding features

List of changes proposed in this pull request

• Updated the color scheme for progress bars and value displays in BonusCardCounter, BonusProgressBar, and ProgressBar components to use blueIO-500 instead of blueItalia-500
• Corrected the error message key for empty values in the multi-value prerequisites onboarding screen to use the appropriate translation
• Removed an extra divider in the discount details bottom sheet for a cleaner UI
• Enhanced divider rendering logic in IdPayInitiativeTimelineComponent to avoid unnecessary dividers at the end of the timeline
• Updated IdPayCompletionScreen to use the new subtitle format, enabling rich text styling (including bold) and improved alignment
• Updated IDPay GenericError copy

How to test

• Try to onboard successfully an initiative and ensure that now success screen copy is aligned with design
• Try to onboard with a GenericError and ensure that copy title is aligned with design
• With light mode enabled, check that color of progress bar and expensive amount from IDPAY_DETAILS_MONITORING and IDPAY_BARCODE_RESULT are now aligned with design
• Check that in IDPAY_DETAILS_MONITORING timeline list last element (bottom-most) has no divider
• Tap on Usa il bonus CTA, ensure that there's no Divider below Genera un codice sconto

[github-actions]

PR Title Validation for conventional commit type

✅ All good! PR title follows the conventional commit type.

[github-actions]

Jira Pull Request Link

This Pull Request refers to Jira issues:

• IOBP-2074
• IOBP-2070

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.60%. Comparing base (7948343) to head (60dd0fc).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ls/components/IdPayInitiativeTimelineComponent.tsx	0.00%	3 Missing ⚠️
...idpay/onboarding/screens/IdPayCompletionScreen.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7486      +/-   ##
==========================================
- Coverage   59.60%   59.60%   -0.01%     
==========================================
  Files        1830     1830              
  Lines       39532    39535       +3     
  Branches     9124     9126       +2     
==========================================
  Hits        23564    23564              
- Misses      15887    15889       +2     
- Partials       81       82       +1     

Files with missing lines	Coverage Δ
ts/components/BonusCard/BonusCardCounter.tsx	96.00% <100.00%> (ø)
...s/features/bonus/common/components/ProgressBar.tsx	90.00% <100.00%> (ø)
...tails/hooks/useIdPayDiscountDetailsBottomSheet.tsx	53.57% <ø> (ø)
...ing/screens/IdPayMultiValuePrerequisitesScreen.tsx	4.54% <ø> (ø)
...idpay/onboarding/screens/IdPayCompletionScreen.tsx	4.16% <0.00%> (-0.19%)	⬇️
...ls/components/IdPayInitiativeTimelineComponent.tsx	75.00% <0.00%> (-3.95%)	⬇️

... and 1 file with indirect coverage changes

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