Implement Order Book Screen

[AndreaDiazCorreia]

Create the main Order Book screen where users can view available buy/sell offers, toggle between BUY/SELL tabs, and filter offers.

Tasks:

• Implement BUY/SELL tabs design at the top

• Create offer filter component

• Implement offer card list with all details (amount, currency, payment method, reputation)

• Add posting time indicator

• Implement bottom navigation bar

• Connect to orderEventsProvider to fetch data

• Implement tab switching functionality

[AndreaDiazCorreia]

Issue close with the PR #98