Sale timings are incorrect on westend

[seadanda]

The block number provider switch introduced in paritytech/polkadot-sdk#5656 is live on westend with the deployment of the stable2503 release. This makes sale boundaries (interlude, lead-in, sale rotation) more deterministic in time as it is all done with the relay chain block number as clock.

Now in the UI we have things like:

This just requires a change in your time calculation logic - it's still interpreting the number in storage as local block number.

It's going to hit Kusama and Polkadot with stable2503, so probably not before mid may at the earliest on Kusama and later on Polkadot.