[SPIKE] Explore limiting connected dapps to certain public keys

[piyalbasu]

Right now when you connect a dapp to Freighter, the connection is global. This means if I have 3 addresses in Freighter, and I connect dapp.com, dapp.com can request and instantly receive any one of those 3 public keys on any network.

For now, "connection" just means that Freighter will transmit the public key without prompting the user. But in the future, we may want to give a connected dapps more rights and privileges. In that case, we will want to limit what accounts a dapp can connect to by having a Freighter user have to opt each one of their addresses in.

For example: If I connect public key G1 on Testnet to a dapp, the dapp shouldn't be connected to G2 or G1 on Mainnet.

• We'll need to adjust our schema to silo connection by public key and network
• We'll need to show users what keys on a network are connected to each dapp in Connected dapps. How will we show this?
• Will we want to limit signing of tx's to just keypairs that are connected to the originating dapp?