test: add API route and E2E tests for issues #368-371

[esthertitilayo-dev]

Fixes #368, #369, #370, #371

Addresses issues #368-371:

• Add API Route Tests for POST /api/reviews #368: Add API route tests for POST /api/reviews (validation, duplicate prevention, invalid rating, comment length)
• Add API Route Tests for DELETE /api/reviews/[id] #369: Add API route tests for DELETE /api/reviews/[id] (authorization checks, 404/403 handling)
• Add E2E Tests for Project Discovery Flow #370: Add E2E tests for Project Discovery Flow (filtering, pagination, sorting, search, project detail display)
• Add E2E Tests for Wallet Connection Flow #371: Add E2E tests for Wallet Connection Flow (Freighter integration, network validation, persisted connections)

New test files:

• dongle/tests/api/reviews.post.test.ts - POST /api/reviews tests
• dongle/tests/api/reviews.delete.test.ts - DELETE /api/reviews/[id] tests
• dongle/tests/api/reviews.e2e.test.ts - Project Discovery Flow E2E tests
• dongle/tests/api/wallet.e2e.test.ts - Wallet Connection Flow E2E tests

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