It'd be great to be able to bridge from Optimism Mainnet to Base without needing to bridge to Ethereum first, directly in the Coinbase Wallet extension

You can do that, and it will most likely be routed via LI.FI. Jumper.Exchange, for example:

cma.xyz. Founder /paragraph, previously at Google and Coinbase

The easiest and most secure crypto wallet and dapp browser. Your gateway to getting onchain. /coinbasewallet

"Tough times never last, but tough people do."
Interested in a better future for people & planet. d/acc. Validating on over 22 chains.

That's a screenshot of a website app, which you can use by connecting the CB wallet.

That’s not the Coinbase wallet extension. This thread is solely to provide feedback to @coinbasewallet