Add read-only (unauthenticated) viewing mode to rofl.app

[ptrus]

It would be very useful for rofl.app to support a read-only / unauthenticated viewing mode for public on-chain data.

Most of the information shown in rofl.app (machines, providers, offers, expiration times, etc.) is derived from public on-chain state, so requiring users to sign in just to view this data isn’t strictly necessary and limits usability.

The idea would be to allow anyone to open rofl.app with an address or account and (admin):

• Browse machines and related public state
• See expiration times and other metadata
• Share links to these views without requiring authentication

Authentication would still be required for any actions that modify state, but read-only access would make rofl.app much more useful as a public, explorer-like interface and allow other tools to link to it instead of duplicating functionality.

We could also deep-link from the explorer rofl app page to it.