feat: router.back() navigation, read-only evaluation view, auth audit logging

- Convert all Back buttons platform-wide (38 files) to use router.back()
  for natural browser-back behavior regardless of entry point
- Add read-only view for submitted evaluations in closed rounds with
  blue banner, disabled inputs, and contextual back navigation
- Add auth audit logs: MAGIC_LINK_SENT, PASSWORD_RESET_LINK_CLICKED,
  PASSWORD_RESET_LINK_EXPIRED, PASSWORD_RESET_LINK_INVALID
- Learning Hub links navigate in same window for all roles
- Update settings descriptions to reflect all-user scope

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(jury)/jury/awards/[id]/page.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { use, useState } from 'react'
-import Link from 'next/link'
+import { useRouter } from 'next/navigation'
 import { trpc } from '@/lib/trpc/client'
 import { Button } from '@/components/ui/button'
 import {
@@ -29,6 +29,7 @@ export default function JuryAwardVotingPage({
   params: Promise<{ id: string }>
 }) {
   const { id: awardId } = use(params)
+  const router = useRouter()
 
   const utils = trpc.useUtils()
   const { data, isLoading, refetch } =
@@ -120,11 +121,9 @@ export default function JuryAwardVotingPage({
   return (
     <div className="space-y-6">
       <div className="flex items-center gap-4">
-        <Button variant="ghost" asChild className="-ml-4">
-          <Link href="/jury/awards">
-            <ArrowLeft className="mr-2 h-4 w-4" />
-            Back to Awards
-          </Link>
+        <Button variant="ghost" onClick={() => router.back()} className="-ml-4">
+          <ArrowLeft className="mr-2 h-4 w-4" />
+          Back
         </Button>
       </div>