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/user_offices_provider.dart

@@ -52,9 +52,9 @@ final userOfficesProvider = StreamProvider<List<UserOffice>>((ref) {
     stream: client
         .from('user_offices')
         .stream(primaryKey: ['user_id', 'office_id'])
-        .order('created_at'),
+        .order('created_at', ascending: true),
     onPollData: () async {
-      final data = await client.from('user_offices').select().order('created_at');
+      final data = await client.from('user_offices').select().order('created_at', ascending: true);
       return data.map(UserOffice.fromMap).toList();
     },
     fromMap: UserOffice.fromMap,