Implement Party Invitation Acceptance Modal

[KuchiMercy]

Complexity: Medium (150 points)

Description

Create a modal component for party members to accept or reject escrow invitations with confirmation dialogs.

Requirements and Context

PartiesSection has accept/reject buttons but they're non-functional
Users need clear UI to review escrow terms before accepting
Modal should show escrow summary and require explicit confirmation
Connects to backend POST /escrows/:id/parties/:partyId/accept|reject

Suggested Execution

Create PartyAcceptanceModal.tsx in apps/frontend/components/escrow/modals/
Add escrow summary display with amount, parties, conditions
Implement accept/reject handlers with API calls
Add loading states and error handling
Update PartiesSection to use the modal

Test and Commit

Test modal open/close behavior
Test accept and reject flows with mock API
Verify loading and error states display correctly

Example Commit Message

feat(frontend): add party invitation acceptance modal component

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 150 Points.

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