feat: user dropdowns collapse 'All Staff' behind expandable toggle

- Add shared UserSelectContent component with Claims-first layout
- All Staff section is collapsed by default, click the label to expand
- Applied to: tasks 'Viewing as', tasks 'Transfer to', assign page
  (claims advocate + bulk assign), additional service modal 'Assign to'

.claude/settings.local.json

@@ -10,7 +10,10 @@
       "Bash(git remote add:*)",
       "Bash(git commit:*)",
       "Bash(git config:*)",
-      "Bash(git push:*)"
+      "Bash(git push:*)",
+      "Bash(curl -s -X POST https://login.microsoftonline.com/480673c9-b57f-4366-b0ea-e317cbc6c160/oauth2/v2.0/token -H 'Content-Type: application/x-www-form-urlencoded' -d 'client_id=f6c778cf-c850-47d0-85e7-aff1d1c3288b&client_secret=0Wi8Q~6hvmszI1W4WeK3iI~NeSixFggyhcC_Qavk&scope=https://graph.microsoft.com/.default&grant_type=client_credentials')",
+      "Bash(python3 -c \"import sys,json; d=json.load\\(sys.stdin\\); print\\(d.get\\('id',''\\), d.get\\('name',''\\), d.get\\('error',''\\)\\)\")",
+      "Bash(python3 -c \"import sys,json; d=json.load\\(sys.stdin\\); print\\(json.dumps\\(d, indent=2\\)\\)\")"
     ]
   }
 }