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>

supabase/migrations/20260926120000_task_attachment_write_hardening.sql

@@ -0,0 +1,47 @@
+-- QA-027 follow-up: task_attachments storage writes were open to the `public`
+-- role, i.e. UNAUTHENTICATED users could upload, overwrite, and delete task
+-- attachments (worse than the it_service_attachments delete hole). The bucket
+-- stays public for reads (bucket.public = true, unchanged); lock down writes:
+--   * INSERT: any authenticated user (uploads happen while signed in)
+--   * UPDATE/DELETE: the uploader (objects.owner) or a task-privileged role
+-- The read policy ("task attachments policy 6srt2u_0") is left untouched.
+
+DROP POLICY IF EXISTS "task attachments policy 6srt2u_1" ON storage.objects;  -- was INSERT/public
+CREATE POLICY "task_attachments_insert" ON storage.objects
+  FOR INSERT TO authenticated
+  WITH CHECK (bucket_id = 'task_attachments');
+
+DROP POLICY IF EXISTS "task attachments policy 6srt2u_2" ON storage.objects;  -- was UPDATE/public
+CREATE POLICY "task_attachments_update" ON storage.objects
+  FOR UPDATE TO authenticated
+  USING (
+    bucket_id = 'task_attachments'
+    AND (
+      owner = auth.uid()
+      OR EXISTS (SELECT 1 FROM public.profiles p
+                 WHERE p.id = auth.uid()
+                   AND p.role IN ('admin', 'programmer', 'dispatcher', 'it_staff'))
+    )
+  )
+  WITH CHECK (
+    bucket_id = 'task_attachments'
+    AND (
+      owner = auth.uid()
+      OR EXISTS (SELECT 1 FROM public.profiles p
+                 WHERE p.id = auth.uid()
+                   AND p.role IN ('admin', 'programmer', 'dispatcher', 'it_staff'))
+    )
+  );
+
+DROP POLICY IF EXISTS "task attachments policy 6srt2u_3" ON storage.objects;  -- was DELETE/public
+CREATE POLICY "task_attachments_delete" ON storage.objects
+  FOR DELETE TO authenticated
+  USING (
+    bucket_id = 'task_attachments'
+    AND (
+      owner = auth.uid()
+      OR EXISTS (SELECT 1 FROM public.profiles p
+                 WHERE p.id = auth.uid()
+                   AND p.role IN ('admin', 'programmer', 'dispatcher', 'it_staff'))
+    )
+  );