AdminCustomersPage: founder view of all teams + tier/promo actions

[mastermanas805]

Summary

• New /app/admin/customers page — gated on ctx.me.is_platform_admin (new field on AuthMeResponse). Non-admin users redirect to root (404-equivalent, not 403), so the route's existence isn't leaked. Sidebar link is also conditional.
• Table with sortable headers (default MRR desc), filter pills (All / Anonymous / Free / Hobby / Pro / Team), and a search box.
• Row click opens CustomerDetailDrawer — a right-side slide-in with four tabs (Overview / Resources / Activity / Promos) so the operator never loses list context.
• Two write actions live in the drawer:
  • Promote / demote tier — typed PROMOTE or DEMOTE confirmation, derived from the tier rank delta. Reason field is required and lands in the audit log.
  • Issue promo — kind (percent_off / first_month_free / amount_off), value, applies_to, valid_for_days. On success, the modal flips to "Issued" state with a copy button on the generated code.

Backend contract assumed (Track A)

The dashboard talks to four new endpoints. Where Track A's shape differs from these assumptions, the adapter in src/api/index.ts is the single place to fix:

• GET /api/v1/admin/customers?q=&tier=&sort_by=&limit=&offset= → { ok, customers: AdminCustomerSummary[], total }
• GET /api/v1/admin/customers/:team_id → { ok, team, users, resources, audit_log[], deploys, subscription, promos? }
• POST /api/v1/admin/customers/:team_id/tier → { tier, reason } → { ok, team }
• POST /api/v1/admin/customers/:team_id/promo → { kind, value, applies_to, valid_for_days } → { ok, code, expires_at }
• /auth/me carries a new is_platform_admin?: boolean flag.

Fields where I made an assumption Track A might not match exactly:

• AdminCustomerSummary.mrr_monthly / mrr_yearly — assumed INR paise (×100), formatted via Intl.NumberFormat('en-IN', { style: 'currency', currency: 'INR' }). If Track A returns rupees or USD cents, only formatINRCompact in AdminCustomersPage.tsx and formatINR in the drawer need to change.
• AdminCustomerSummary.name — marked optional because some old teams have no display name; the drawer falls back to team.display_name / team.name / summary.name in that order.
• AdminCustomerDetailResponse.promos is optional — the page degrades to an empty list when the field isn't present.
• subscription may be null for unpaid teams (rendered as "none").
• Sort is currently client-side (result set is small per the brief; Track A clamps to 200). The sort_by query param is sent but the page re-sorts locally for instant header-click feedback.

Test plan

• npm test — 365 passed / 3 skipped (was 342, +23 new in AdminCustomersPage.test.tsx)
• npm run build — clean; page lazy-chunked to ~23 KB (gzip 6.4 KB)
• Manual smoke once Track A is live: log in as a platform admin, verify the link appears, page renders, drawer opens, tier change + promo modals POST and refetch.
• Verify non-admin users 404 on the deep link (currently mocked in tests; need to confirm with a real non-admin /auth/me response).

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