✨ Swap Default Token Pair to ETH and USDC

[shivekkhurana]

User Story

As a developer,
I want to change the default token pair to ETH and USDC,
so that users see famous/familiar tokens when the open saps

Description

We currently have default token pairs set up, but we want to change the default pair to ETH and USDC.

Acceptance Criteria

• Update the default token pair to ETH and USDC.
• Verify that all swap flows are correctly configured with the new default token pair.

Note:

• Figma: https://www.figma.com/design/ap45P6fWjRI4q43WMBivwP/Trading?node-id=135-17524&t=66aMLOTloEADV5U5-4

[mohsen-ghafouri]

This is depend on trading tab. unassigned my self as that part is not implemented yet.