Feature Issue

As a user, I want to select the network to send or bridge tokens from so I can ensure the transaction happens on the desired network.

Description

We need to remove multichain routing support and simplify the network selection process on the Send and Bridge flow. We have some shared logic on the Send and Bridge flow, so ideally we should implement all the simplifications on the same PR to avoid breaking any of those features.

Designs for Send simplification: https://www.figma.com/design/xLs1KYmF4e6WwRTZVJKeUK/Wallet?node-id=16655-177783&m=dev
Designs for Bridge simplification: https://www.figma.com/design/xLs1KYmF4e6WwRTZVJKeUK/Wallet?node-id=16655-240257&m=dev

Acceptance Criteria

• Remove multichain support on Send flow
• Simplify network selection process on Send flow
• Remove multichain support on Bridge flow
• Simplify network selection process on Bridge flow