fix(useChains): fix missing endpoints & chain name crash

[ArefEghbaliDev]

🛠 Fix: useChains Hook Issues

This PR fixes two issues related to the useChains hook in CosmosKit:

1. Community Chains RPC/REST Error

   • Fixed an issue where using useChains with community chains would throw an error due to missing RPC or REST API endpoints in chainRecords.preferredEndpoints.
   • This bug does not occur when running tests but happens when running the example-lite project.
   • Affected chains: 'ethereum', 'rootstock', 'solana', 'ton', 'tron', 'bluechip', 'lorenzo', 'neura', 'paloma', 'unicorn'.

2. Crash When Using Chain Names in ChainProvider 🔗 Fixes: Uncaught TypeError: Cannot read properties of undefined (reading 'chain_id') when using useChains #515

   • Fixed an issue where passing only chain names (instead of full chain info) to ChainProvider caused a crash.
   • This was due to convertChain returning undefined when receiving a chain name instead of a chain object, resulting in an empty chain in chainRecord.
   • This fix ensures proper handling of chain names, preventing the crash.

[mehrdadpfg]

cc: @pyramation