Update deep-link routes in RootNavigator.tsx to match new IA

[christabel888]

Context: src/navigation/RootNavigator.tsx likely defines deep-link routes -- these need to stay in sync with #36's tab restructure.

Where:

• src/navigation/RootNavigator.tsx

What to do:

• Update deep-link route definitions to match the new screen locations from Restructure MainNavigator.tsx tabs: Overview, Assets, Wallets, Soroban, Rankings, Explorer #36.

Suggested approach:

1. Audit every deep-link route in RootNavigator.tsx against the new screen locations from Restructure MainNavigator.tsx tabs: Overview, Assets, Wallets, Soroban, Rankings, Explorer #36 -- this is a mapping exercise, go route by route rather than spot-checking.

Watch out for:

• Deep links are often tested less than in-app navigation since they require external triggers (notifications, universal links) -- explicitly test a few real deep links post-Restructure MainNavigator.tsx tabs: Overview, Assets, Wallets, Soroban, Rankings, Explorer #36, don't just review the code.

Definition of done:

• Existing deep links still resolve correctly after the nav restructure