feat: add demo mode entry in onboarding screen

[kathaypacific]

Description

The scope of this PR is limited to:

1. adding dynamic config to support launching and displaying demo mode
2. adding the entry point in onboarding to launch demo mode
3. displaying the app with some indication that demo mode is active (I've added the gradient border for now)

Test plan

(It's not clear in the video but for the first 5 seconds, I am long pressing the logo)

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2025-01-27.at.13.09.24.mp4

Related issues

• Related to RET-1303

Backwards compatibility

Y

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)

[kathaypacific]

removing these selectors allowed me to break the cyclical dependency of statsig -> walletAddressSelector in src/web3/selectors -> statsig. this cycle was causing the imports from statsig to be undefined, which caused tests to fail (since you cannot pass undefined to createSelector). i don't see any problems with having no userID / the previous userID during demo mode

[codecov]

Codecov Report

Attention: Patch coverage is 95.91837% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.10%. Comparing base (f34cfbe) to head (c5ef646).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/web3/reducer.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6453      +/-   ##
==========================================
- Coverage   89.11%   89.10%   -0.02%     
==========================================
  Files         733      731       -2     
  Lines       31907    31854      -53     
  Branches     6099     6090       -9     
==========================================
- Hits        28433    28382      -51     
+ Misses       3427     3279     -148     
- Partials       47      193     +146     

Files with missing lines	Coverage Δ
src/account/selectors.ts	96.96% <ø> (-0.09%)	⬇️
src/navigator/NavigatorWrapper.tsx	72.64% <100.00%> (+1.64%)	⬆️
src/onboarding/welcome/Welcome.tsx	98.38% <100.00%> (+0.42%)	⬆️
src/redux/migrations.ts	97.01% <100.00%> (+<0.01%)	⬆️
src/redux/store.ts	89.23% <ø> (ø)
src/statsig/constants.ts	100.00% <ø> (ø)
src/statsig/index.ts	98.91% <100.00%> (-0.03%)	⬇️
src/statsig/types.ts	100.00% <100.00%> (ø)
src/web3/actions.ts	100.00% <100.00%> (ø)
src/web3/selectors.ts	100.00% <100.00%> (ø)
... and 2 more

... and 74 files with indirect coverage changes

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