feat(cico): Add experiment and update enter amount screen

[finnian0826]

Description

Matches designs for cash-in flow when experiment is treatment.

Updated some fonts/colors to match designs (across all variants/flows)

Test plan

Unit tests added/updates

Related issues

• Fixes ACT-1499

Backwards compatibility

Yes

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 89.08%. Comparing base (0ab67bc) to head (9c0c23d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fiatExchanges/FiatExchangeAmount.tsx	68.42%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6458      +/-   ##
==========================================
- Coverage   89.09%   89.08%   -0.02%     
==========================================
  Files         731      730       -1     
  Lines       31816    31841      +25     
  Branches     5769     5779      +10     
==========================================
+ Hits        28348    28367      +19     
- Misses       3422     3428       +6     
  Partials       46       46              

Files with missing lines	Coverage Δ
src/analytics/Properties.tsx	100.00% <ø> (ø)
src/statsig/constants.ts	100.00% <ø> (ø)
src/statsig/types.ts	100.00% <100.00%> (ø)
src/fiatExchanges/FiatExchangeAmount.tsx	82.30% <68.42%> (+0.41%)	⬆️

... and 15 files with indirect coverage changes

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