feat: implement network switch

[goga-m]

Summary

Closes https://app.clickup.com/t/86dvv87bz

• Addition of mainsail mainnet network, with the default configs from PSDK.
• usePortfolio hook now mutates & filters wallets based on the active network
• A new hook useActiveNetwork is implemented, to provide the selected network, which can be used throughout the app and it's decoupled from wallets.
• Network Step is removed from wallet creation & wallet import flows. It should always use the active network from the navigation.

For testing

1. Enable Testnet toggle in Settings -> General -> Show Development Network.
2. Import, create wallets and see them persisted per active network.
3. The address selection is also per network.
4. Votes page should also render data filtered by the active network.
5. All the pages are reactive to the navigation network toggle,vso changing the network should re-render the page if necessary based on the selection.

A few more notes:

• Existing profile wallet selections may not work, as the underlying structure has been changed and we need to re-apply the selection for existing profiles.
• Wallet creation and import should work without issues with mainnet. However, as the existing config uses endpoints from testnet, you might see transactions & other network data from testnet. They can be ignored, and we can retest once we have the mainnet ready and pass the correct config in PSDK.
• Default network is Testnet.
• Mobile designs are not added yet, as we can inject the toggle once the navigation UI refactor will be ready in refactor: navbar styling #958
  UPDATE: UI designs should be updated as refactor: navbar styling #958 is merged.

Checklist

• My changes look good in both light AND dark mode
• The change is not hardcoded to a single network, but has multi-asset in mind
• I checked my changes for obvious issues, debug statements and commented code
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

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[goga-m]

@ItsANameToo we should be ok now.