Add payment proof freshness badge to paid results

[emrekayat]

Why this matters

SCF reviewers should be able to tell whether a displayed payment proof is fresh or stale without inspecting raw timestamps in the API payload.

Scope

Add a small freshness badge for paid-query proof metadata in the dashboard result panel:

• Fresh when proof timestamp is recent;
• Stale when older than a conservative threshold;
• Unavailable when no proof timestamp exists;
• tooltip/copy that does not imply settlement if evidence is missing.

Suggested files:

• apps/web/src/App.tsx
• apps/web/src/types.ts
• packages/shared/src/schemas.ts if response typing needs a field.

Acceptance criteria

• Badge is driven from API result/payment metadata, not hard-coded demo state.
• Missing proof timestamp renders as unavailable, not fresh.
• Demo-mode result still clearly shows it is demo evidence.
• Component or frontend test covers fresh, stale, and missing cases.
• No payment execution behavior changes.

Wave complexity

High - improves reviewer confidence in paid-query evidence freshness.

[Killerjunior]

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[oscar24357]

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[code-0-stella]

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[Osifowora]

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Congratulations, @Osifowora! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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