Session Initialization UI (The Funding Flow)

[Luluameh]

Source: FRONTEND_ISSUES.md (Issue 15)

Background
Starting a session requires escrowing funds into the smart contract.
Goal
Build a wizard/stepper for funding a session.
Acceptance Criteria

• Step 1: Select duration/amount.
• Step 2: Confirm transaction via Freighter wallet.
• Step 3: Success state routing to the active session room.
  Key Files
  src/components/marketplace/FundSessionModal.tsx

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