Implement 15 platform features: digest, availability, templates, comparison, live voting SSE, file versioning, mentorship, messaging, analytics, drafts, webhooks, peer review, audit enhancements, i18n

Features implemented:
- F1: Email digest notifications with cron endpoint and per-user frequency
- F2: Jury availability windows and workload preferences in smart assignment
- F3: Round templates with save-from-round and CRUD management
- F4: Side-by-side project comparison view for jury members
- F5: Real-time voting dashboard with Server-Sent Events (SSE)
- F6: Live voting UX: QR codes, audience voting, tie-breaking, score animations
- F7: File versioning, inline preview, bulk download with presigned URLs
- F8: Mentor dashboard: milestones, private notes, activity tracking
- F9: Communication hub with broadcasts, templates, and recipient targeting
- F10: Advanced analytics: cross-round comparison, juror consistency, diversity metrics, PDF export
- F11: Applicant draft saving with magic link resume and cron cleanup
- F12: Webhook integration layer with HMAC signing, retry, and delivery logs
- F13: Peer review discussions with anonymized scores and threaded comments
- F14: Audit log enhancements: before/after diffs, session grouping, anomaly detection, retention
- F15: i18n foundation with next-intl (EN/FR), cookie-based locale, language switcher

Schema: 12 new models, field additions to User, Project, ProjectFile, LiveVotingSession, LiveVote, MentorAssignment, AuditLog, Program
New routers: roundTemplate, message, webhook (registered in _app.ts)
New services: email-digest, webhook-dispatcher
New cron endpoints: /api/cron/digest, /api/cron/draft-cleanup, /api/cron/audit-cleanup
New API routes: /api/live-voting/stream (SSE), /api/files/bulk-download

All features are admin-configurable via SystemSettings or per-model settingsJson fields.
Docker build verified successfully.

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

src/components/shared/file-preview.tsx

@@ -0,0 +1,103 @@
+'use client'
+
+import { useState } from 'react'
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Eye, Download, FileText, Image as ImageIcon, Video, File } from 'lucide-react'
+
+interface FilePreviewProps {
+  fileName: string
+  mimeType: string
+  downloadUrl: string
+}
+
+function getPreviewType(mimeType: string): 'pdf' | 'image' | 'video' | 'unsupported' {
+  if (mimeType === 'application/pdf') return 'pdf'
+  if (mimeType.startsWith('image/')) return 'image'
+  if (mimeType.startsWith('video/')) return 'video'
+  return 'unsupported'
+}
+
+function getFileIcon(mimeType: string) {
+  if (mimeType === 'application/pdf') return FileText
+  if (mimeType.startsWith('image/')) return ImageIcon
+  if (mimeType.startsWith('video/')) return Video
+  return File
+}
+
+export function FilePreview({ fileName, mimeType, downloadUrl }: FilePreviewProps) {
+  const [open, setOpen] = useState(false)
+  const previewType = getPreviewType(mimeType)
+  const Icon = getFileIcon(mimeType)
+  const canPreview = previewType !== 'unsupported'
+
+  if (!canPreview) {
+    return (
+      <Button variant="outline" size="sm" asChild>
+        <a href={downloadUrl} target="_blank" rel="noopener noreferrer">
+          <Download className="mr-2 h-4 w-4" />
+          Download
+        </a>
+      </Button>
+    )
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={setOpen}>
+      <DialogTrigger asChild>
+        <Button variant="outline" size="sm">
+          <Eye className="mr-2 h-4 w-4" />
+          Preview
+        </Button>
+      </DialogTrigger>
+      <DialogContent className="max-w-4xl max-h-[90vh]">
+        <DialogHeader>
+          <DialogTitle className="flex items-center gap-2 truncate">
+            <Icon className="h-4 w-4 shrink-0" />
+            {fileName}
+          </DialogTitle>
+        </DialogHeader>
+        <div className="overflow-auto">
+          {previewType === 'pdf' && (
+            <iframe
+              src={`${downloadUrl}#toolbar=0`}
+              className="w-full h-[70vh] rounded-md"
+              title={fileName}
+            />
+          )}
+          {previewType === 'image' && (
+            <img
+              src={downloadUrl}
+              alt={fileName}
+              className="w-full h-auto max-h-[70vh] object-contain rounded-md"
+            />
+          )}
+          {previewType === 'video' && (
+            <video
+              src={downloadUrl}
+              controls
+              className="w-full max-h-[70vh] rounded-md"
+              preload="metadata"
+            >
+              Your browser does not support the video tag.
+            </video>
+          )}
+        </div>
+        <div className="flex justify-end">
+          <Button variant="outline" size="sm" asChild>
+            <a href={downloadUrl} target="_blank" rel="noopener noreferrer">
+              <Download className="mr-2 h-4 w-4" />
+              Download
+            </a>
+          </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  )
+}