test: add integration coverage for admin proxy evaluation

Seven scenarios covering the new admin procedures:
- non-admin users are rejected on adminStart/adminSubmitOnBehalf
- admin can list a juror's assignments with COI flag surfaced
- admin can complete the full draft→autosave→submit cycle with the
  voting window already closed, confirming bypass works
- COI-declared assignments still block admin submission
- feedback minimum length is enforced on admin submit
- adminAutosave refuses to overwrite a SUBMITTED evaluation
- audit log captures admin id, juror id, and bypassedWindow flag

Also swaps a lucide icon alias (FileEdit → Pencil) in the juror
assignments page to avoid the deprecated alias form.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/(admin)/admin/rounds/[roundId]/jurors/[userId]/evaluate/page.tsx

@@ -13,7 +13,7 @@ import {
   ArrowRight,
   CheckCircle2,
   Clock,
-  FileEdit,
+  Pencil,
   ShieldAlert,
   UserCheck,
 } from 'lucide-react'
@@ -184,7 +184,7 @@ function AssignmentRow({ roundId, userId, assignment, mode }: AssignmentRowProps
     evaluation?.status === 'SUBMITTED' || evaluation?.status === 'LOCKED'
       ? CheckCircle2
       : evaluation?.status === 'DRAFT'
-        ? FileEdit
+        ? Pencil
         : Clock
 
   const href = `/admin/rounds/${roundId}/jurors/${userId}/evaluate/${project.id}` as Route