QA hardening: security RLS fixes, Flutter 3.47.5 upgrade, UI/validation fixes

Security — enforce write authorization server-side (was UI/RPC-only):
- it_service_requests RLS: block cross-office read/edit + self-approve (QA-015)
- pass_slips RLS: owner can complete but not self-approve (QA-046)
- swap_requests RLS: scope select/update to participants + admin (QA-047)
- storage: tighten it_service_attachments + task_attachments write/delete (QA-027)
- admin_user_management edge function: allow programmers to manage users (QA-016)

Fixes:
- workforce generator "uncovered shifts" false alarms (QA-043/044)
- network-map VLAN + New-location dialog validation, disabled-until-valid (QA-048)
- de-flake time-of-day-dependent dashboard metrics test (QA-045)

Toolchain:
- upgrade to Flutter 3.47.5 / Dart 3.13.4; font_awesome_flutter 11.0.0,
  flutter_quill 11.6.0, pdfrx 2.6.5; clear resulting deprecations (QA-002)

analyze clean; 139 tests pass; web build succeeds. Report + evidence in docs/qa/.

Note: also carries the in-progress Brick model cleanup already present in the
working tree. QA-001 (AI keys public in the build) is deferred by owner decision.

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/providers/network_map/network_sites_provider.dart

@@ -6,7 +6,7 @@ import '../supabase_provider.dart';
 
 final networkSitesProvider = FutureProvider<List<NetworkSite>>((ref) async {
   final client = ref.watch(supabaseClientProvider);
-  final rows = await client.from('network_sites').select().order('name');
+  final rows = await client.from('network_sites').select().order('name', ascending: true);
   return (rows as List)
       .map((r) => NetworkSite.fromMap(r as Map<String, dynamic>))
       .toList();
@@ -14,7 +14,7 @@ final networkSitesProvider = FutureProvider<List<NetworkSite>>((ref) async {
 
 final networkLocationsProvider = FutureProvider<List<NetworkLocation>>((ref) async {
   final client = ref.watch(supabaseClientProvider);
-  final rows = await client.from('network_locations').select().order('name');
+  final rows = await client.from('network_locations').select().order('name', ascending: true);
   return (rows as List)
       .map((r) => NetworkLocation.fromMap(r as Map<String, dynamic>))
       .toList();