feat(ui-react): add admin sessions list and detail pages

[luannmoreira]

What

Adds paginated admin sessions list and per-session detail pages to the
React console, accessible at /admin/sessions and
/admin/sessions/:uid.

Why

The admin console lacked visibility into sessions across all namespaces.
The Vue admin already exposed this data; this brings parity to the React
console.

Changes

• pages/admin/Sessions: table with active indicator, auth shield,
  device chip, IP, and timestamps; clicking a row navigates to the
  detail page; error banner uses role="alert" for accessibility
• pages/admin/SessionDetails: per-session detail view
• hooks/useAdminSessionsList: React Query hook wrapping
  getSessionsAdmin; transforms SdkHttpError (which carries
  status/headers but no message) into a human-readable Error
  before surfacing it — without this, error.message was undefined
  at runtime despite TypeScript typing it as Error | null
• hooks/useAdminSessionDetail: hook for the detail page
• App.tsx: registers the two new routes inside the admin guard

Testing

27 new unit tests covering the hook (disabled when non-admin, success
mapping, all error-transformation branches) and the page (loading,
empty, error banner, row rendering, navigation, auth indicators, device
fallback, pagination).

npx vitest run src/hooks/__tests__/useAdminSessionsList.test.ts \
              src/pages/admin/__tests__/Sessions.test.tsx

[github-actions]

Claude finished @luannmoreira's task in 7m 16s —— View job

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Code Review Complete

Reviewed 7 files across code quality, security, testing, TypeScript/React patterns, and architecture — no issues found. The code looks good as-is.

The implementation is well-structured: hooks correctly gate on admin state, error transformation in useAdminSessionsList properly handles SDK errors, routes are placed inside the existing admin guard, pagination handles edge cases, and the test suite covers loading/empty/error states plus row rendering and navigation.

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If you push additional changes and want a new review, tag @shellhub-io/admin and a team member can trigger it.

[gustavosbarreto]

/review

[github-actions]

Claude encountered an error —— View job

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I'll analyze this and get back to you.

[gustavosbarreto]

/review

[github-actions]

Claude finished @gustavosbarreto's task in 7m 18s —— View job

---

Code Review Complete

Reviewed 7 files across code quality, security, testing, TypeScript/React patterns, and architecture — no issues found. The code looks good as-is.

The implementation follows established patterns well: hooks correctly gate on admin state, error transformation in useAdminSessionsList properly handles SDK errors, routes are placed inside the existing AdminRoute + LicenseGuard guard, the new paginated hook coexists cleanly with the dashboard-scoped useAdminSessions, and the test suite covers loading/empty/error states plus row rendering and navigation.

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If you've addressed the feedback and want a new review, tag @shellhub-io/admin and a team member can trigger it.