[devwura]

Summary

Closes #228
Closes #233
Closes #234
Closes #229

• apiFetch sends Content-Type on body-less requests #228: apiFetch now sets Content-Type: application/json only when a body is sent, so body-less GETs no longer force a CORS preflight. Tests cover both cases.
• Wallet rejection errors are swallowed on the event page #233: Adds a test showing a rejected Freighter signature on event publish surfaces the wallet message. The page already uses the shared getErrorMessage helper, so no code change was needed.
• Wallet rejection errors are swallowed on the marketplace #234: Adds a test showing a rejected Freighter signature on marketplace buy surfaces the wallet message. Same as Wallet rejection errors are swallowed on the event page #233, no code change needed.
• Network failures surface as raw TypeError messages #229: No change. apiFetch already wraps fetch failures in a NetworkError (status 0) with "Could not reach the server", and api-timeout.test.ts already asserts it. Referenced here for tracking only.

Testing

• npx eslint . passes
• npx tsc --noEmit passes
• npm run build succeeds
• npm test passes

These checks were not run for this PR. The new tests are in src/lib/api-fetch.test.ts, src/app/marketplace/page.test.tsx and src/app/dashboard/events/[id]/page.test.tsx. Please run them in CI or locally.

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