feat(frontend): route-segment error.tsx for claims, policies, and admin #233

Job	Run time
Contract (Rust / Soroban)	1m 20s
Frontend (lint → typecheck → build → test)	35s
Backend unit tests	26s
Accessibility (axe / Playwright)	35s
Soroban ABI golden vectors	0s
Playwright E2E tests	0s
	2m 56s

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