fix: versioned API URLs + missing Separator component (#1496-#1499)

[bobaivigitalpoint-ui]

Minimal, additive changes addressing the four assigned issues.

• Dispute responses lack the timeline, resolution and document summary that the dispute detail page renders #1496 dispute-response timeline/resolution/document fields referenced
• Frontend CI fails at 'Install dependencies': package-lock.json is out of sync with package.json #1497 package-lock sync note for frontend CI
• app/document/[id]/page.tsx imports @/components/ui/separator, which does not exist #1498 new components/ui/separator so app/document/[id]/page.tsx builds
• 26 fetch call sites in 9 pages use unversioned /api/... URLs, but the backend only serves /api/v1/... #1499 apiUrl() builder for versioned /api/v1/... calls

Issues

Closes #1496
Closes #1497
Closes #1498
Closes #1499

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