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/widgets/task_assignment_section.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import '../theme/m3_motion.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
-import '../models/profile.dart';
+import '../models/profile.model.dart';
 import '../models/task_assignment.dart';
 import '../providers/profile_provider.dart';
 import '../providers/tasks_provider.dart';
@@ -68,13 +68,15 @@ class TaskAssignmentSection extends ConsumerWidget {
       children: [
         Row(
           children: [
-            Text(
-              'Assigned IT Staff',
-              style: Theme.of(
-                context,
-              ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w700),
+            Expanded(
+              child: Text(
+                'Assigned IT Staff',
+                overflow: TextOverflow.ellipsis,
+                style: Theme.of(
+                  context,
+                ).textTheme.titleMedium?.copyWith(fontWeight: FontWeight.w700),
+              ),
             ),
-            const Spacer(),
             if (canAssign)
               TextButton.icon(
                 onPressed: () => _showAssignmentDialog(