feat: build agent activity audit log timeline with advanced filtering

[Abdulrasaq1515]

• Create src/types/audit.ts with AuditEvent, AuditEventType, AuditLogLevel types
• Refactor AuditTimeline.tsx to use TanStack Table for performant rendering
• Add advanced filtering by agent ID, severity level, transaction type, date range
• Implement WCAG AA compliant accessibility with ARIA labels and keyboard navigation
• Add JSON and CSV export capabilities for audit reports
• Create src/features/audit/index.ts for module exports

Closes #65

Summary

Type of change

• Bug fix
• New feature
• Refactor
• Docs

Related issue

Closes #

Checklist

• npm run build passes
• npm run typecheck passes
• npm run lint passes
• No secrets in tracked files

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #65.
Verdict: clean

The PR successfully implements the agent activity audit log timeline component with TanStack Table, advanced filtering, accessibility enhancements, and export features as requested.

Reviewed commit: 84b279f4c1db6fe817c0da183fa0779b88fb2c1f.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: mergeable
Checked commit: 84f0d9a5a73ee0fb0e570b694429dc06e77738ed.

Reason: One or more required CI checks failed.

Failing checks:

• build - view details

Next steps:

1. Open the failing check details above and fix the reported error.
2. Run the same checks locally where possible.
3. Commit and push the fix.
4. MergeKeeper will automatically re-review the updated PR.

[mergekeeper]

Needs review

Linked to #65, but the diff does not match the issue scope.

The pull request modifies transactions page code in src/app/(dashboard)/transactions/page.tsx which is unrelated to issue #65.

Reviewed commit: 4d211fdeef1649ed9c6b237f6590962f884fbdb7.

[mergekeeper]

Approved

The PR successfully implements the agent activity audit log timeline component with TanStack Table, advanced filtering, accessibility enhancements, and export features as requested.

[mergekeeper]

Merged

Merged with squash.