Quick-swap for parts you rotate (chains, etc.)

Some riders rotate multiple chains: one on the bike while the other gets waxed. Right now swapping them takes two separate actions: open chain 1's detail page, uninstall it, then find chain 2 and install it.

Idea: a single "Swap" action. Pick the part that's on the bike, pick the spare that replaces it, done. The old part goes back to your shelf with its wear data intact, ready to come back next rotation.

Chains are the obvious first case, but the same thing would work for any part people keep spares of. Cassettes, tires, wheelsets.