Add Roles & Admin/Super-Admin interface

Per organized-ideas.md §6: role assignment, account ban/unban/delete, and
direct Admin/Super-Admin CRUD of public catalog entries outside the
submission workflow.

Backend:
- list_users_for_admin(): Super-Admin-gated SECURITY DEFINER function
  joining profiles + auth.users (username, email, role, banned_until) —
  auth.users isn't exposed through PostgREST, so this is the only way to
  list accounts at all.
- New Edge Function admin-user-action (ban/unban/delete), using
  @supabase/server's `auth: 'user'` mode to verify the caller's JWT, then
  Supabase Auth's Admin API for the actual mutation. This is deliberately
  an Edge Function rather than a Postgres function like everything else in
  this codebase: touching auth.users needs the Admin API, the stable
  documented interface, not a direct write to a schema Supabase manages
  internally. Self-action guard; verify_jwt = true at the gateway on top of
  the function's own JWT verification.
- 5 new pgTAP tests (43/43 total) for list_users_for_admin (Super-Admin-only,
  even regular Admins get 42501).
- CatalogRepository gains admin* methods (direct edit of a public port/cable/
  device entry, plus adminUnpublish which flips is_public rather than
  deleting) — the update methods were already ownership-agnostic (RLS's
  is_admin() clause is what actually permits it), so these are thin aliases,
  not duplicated logic.

Frontend:
- authStore/AdminUserRepository: minimal role plumbing, shared UserRole type.
- adminUserStore + AdminUsersModal: list/role-dropdown/ban/unban/delete,
  gated to Super Admin only via a new "Manage Users" TopBar button.
- PortTypeManager/CableTypeManager/DevicePalette: built-in entries now show
  direct "Edit"/"Unpublish" for Admins (regular Admin included, per §6's
  capability table — not Super-Admin-exclusive) instead of "Suggest edit";
  unpublish reuses the review-queue's impact-check RPC before confirming.
- DeviceTemplateEditor gains an `adminMode` save path alongside its existing
  submissionMode/resubmitId ones.

Verified: tsc -b and oxlint clean; supabase db reset + 43/43 pgTAP tests
pass; confirmed both new privileged endpoints (the SQL function and the
Edge Function) actually work through the real REST API via live curl
calls — signup, email confirm, role promotion, ban/unban/delete round
trips, self-action guard, non-super-admin rejection, and verify_jwt=true
compatibility all exercised directly, not just asserted.

src/data/SupabaseAdminSubmissionRepository.ts

@@ -1,16 +1,10 @@
 import { v4 as uuid } from 'uuid'
 import type { AdminSubmissionRepository, UsageImpact, UsageImpactSample } from './AdminSubmissionRepository'
+import { CATALOG_TABLE_BY_ENTITY_TYPE } from './catalogRowMapping'
 import type { CatalogSubmission } from './SubmissionRepository'
 import { supabase } from './supabaseClient'
 import { toSubmission, type SubmissionRow } from './submissionRowMapping'
 
-const TABLE_BY_ENTITY_TYPE: Record<CatalogSubmission['entityType'], string> = {
-  device_template: 'device_templates',
-  port_type: 'port_types',
-  cable_type: 'cable_types',
-  device_category: 'device_categories',
-}
-
 interface ProposedDeviceTemplatePort {
   name: string
   direction: string
@@ -45,7 +39,7 @@ export class SupabaseAdminSubmissionRepository implements AdminSubmissionReposit
     // `ports` (device_template only) isn't a column on device_templates
     // itself; pull it out and replace device_template_ports separately.
     const { ports, ...rowPatch } = submission.proposedData as Record<string, unknown> & { ports?: ProposedDeviceTemplatePort[] }
-    const table = TABLE_BY_ENTITY_TYPE[submission.entityType]
+    const table = CATALOG_TABLE_BY_ENTITY_TYPE[submission.entityType]
     const { error } = await supabase
       .from(table)
       .update({ ...rowPatch, is_public: true, owner_id: null })