Add confirmation UI for expensive actions

- Description: Deposits and social exchange are high-stakes actions.
- Acceptance Criteria:
- Add confirmation before deposit.
- Add confirmation before accept and exchange socials.
- Warn clearly about ETH value and side effects.
- Proof: attach a screenshot of the confirmation step.

Locate the TypeScript UI entry points for deposits and for accepting or exchanging socials, then review how these actions are triggered. Add confirmation steps that clearly warn about ETH value and side effects before each action. Done when all three actions require confirmation and a screenshot shows the confirmation UI.

Written by the indexing model from the issue text.