Phase 5: admin storage scan status and retry UI

[kutaelee]

Summary

• Add volume scan API helper (scanVolume) and scan enqueue test coverage.
• Surface auto-scan state/progress/error in Admin Storage active volume section.
• Add retry action for failed auto-scan and periodic refresh while scan is queued/running.

Validation

• pnpm -C packages/ui test -- --run src/api/volumes.spec.ts
• pnpm -C packages/ui typecheck

[chatgpt-codex-connector]

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Reviewed commit: 304fa8df31

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[chatgpt-codex-connector]

Gate auto-refresh on existing scan job

This polling effect refreshes whenever scan_state is queued/running, but it does not require scan_job_id; since volumes can exist with scan_state='queued' and scan_job_id=NULL (see db/init/03_volumes.sql defaults), Admin Storage can enter an endless 3s /admin/volumes poll loop even when no scan is actually in flight. In that state users get repeated loading flicker and the backend gets unnecessary traffic, so the timer should only run when there is a real job id to track.

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[kutaelee]

Reviewed Codex review note and addressed actionable CI issue (React JSX scope import) in commit d61de7f before merge; rerun CI passed. No remaining inline unresolved threads.