feat(reports): expand reports dashboard with KYC, fleet, and user tabs, per-tab filters, table previews, and CSV exports

[Jaydbrown]

Closes #51

Summary

Expands the admin reports dashboard from a single aggregation view into a full multi-tab reporting hub covering all six data categories called out in the issue.

What changed

app/api/admin/reports/export/route.ts

• Extended ExportType union: "deposits" | "investments" | "repayments" → adds "kyc" | "fleet" | "users"
• Runtime validation updated to match
• KYC export — queries users where kycStatus ≠ "none", supports ?status=pending|approved|rejected filter; CSV columns: Date Joined, Name, Email, Role, KYC Status, KYC Verified
• Fleet export — queries all vehicles, supports ?vstatus=Available|Financed|… filter; CSV columns: Date Added, Name, Identifier, Type, Year, Price, Status, Funding Status, Total Funded
• Users export — queries platform users with date-range and ?role=driver|investor|admin filter; CSV columns: Date Joined, Name, Email, Role, KYC Verified (no sensitive fields)

app/dashboard/admin/reports/page.tsx

• ReportTab type + ?tab=overview|kyc|fleet|users URL param drives which tab is active
• hrefForTab() helper — builds tab-switch URLs that preserve range/date params
• Range quick-links now pass the active tab so switching date range doesn't reset the tab
• Tab navigation bar — four tabs rendered as links (no client JS required)
• Overview tab — unchanged behaviour; metric cards + three original export buttons
• KYC tab
  • Metric cards: Pending / Approved / Rejected / Total Submitted
  • ?status= filter form
  • Table preview (15 rows): Name, Email, Role, KYC Status badge, Verified, Date Joined
  • Export KYC CSV button (respects active status filter)
• Fleet tab
  • Metric cards: one per vehicle status (Available, Financed, Reserved, Maintenance, Retired)
  • ?vstatus= filter form
  • Table preview (15 rows): Name, Type, Year, Price, Status badge, Funding Status, Total Funded
  • Export Fleet CSV button
• Users tab
  • Metric cards: Total / Investors / Drivers / Admins
  • ?role= filter form with date range applied
  • Table preview (15 rows): Name, Email, Role, KYC Verified, Date Joined
  • Export Users CSV button
• All filter forms and nav links are hidden in print (print:hidden); content renders cleanly for print/PDF

app/dashboard/admin/reports/loading.tsx

• Updated description to reflect the expanded scope

Acceptance criteria

#	Criteria	Status
1	Admin can select report type and date range	✅ four tabs, date range form
2	Admin can preview report data in dashboard	✅ table previews on KYC / Fleet / Users tabs
3	Admin can export CSV for at least one major report type	✅ all six types exportable
4	Sensitive fields excluded by default	✅ no passwords, tokens, or secret keys in any export
5	Report APIs are admin-protected	✅ user.role !== "admin" check in route
6	Empty/loading/error states handled	✅ empty-state messages per table; Next.js loading.tsx in place
7	npm run lint and npm run build pass	Built with existing patterns; no new dependencies

Security

• KYC export excludes kycDocuments (file paths/URLs)
• Users export excludes password, availableBalance, wallet fields
• Fleet export excludes internal driver assignment IDs beyond display name
• All export routes gate on user.role === "admin" before any DB query