[BUG]: Token selector shows wrong-chain curated tokens on unsupported networks

[arunabha003]

Bug Description

The token selector falls back to a token list from another chain when the active chain does not have its own curated mapping. For example, on Scroll Sepolia it can show Ethereum
mainnet tokens.

This is misleading because the UI suggests those tokens are valid for the current network, even though they may not be deployed or usable there.

Steps to Reproduce

1. Open the Orb frontend on a network such as Scroll Sepolia.
2. Go to the oracle creation flow.
3. Open the weight token selector.
4. Observe that curated tokens from another chain are shown.
5. Select one of those tokens and note that it does not actually correspond to the active network.

Logs and Screenshots

No response

Environment Details

No response

Impact

Medium

Code of Conduct

• I have joined the Discord server and will post updates there
• I have searched existing issues to avoid duplicates