Add jury assignment transfer, cap redistribution, and learning hub overhaul

- Add getTransferCandidates/transferAssignments procedures for targeted
  assignment moves between jurors with TOCTOU guards and audit logging
- Add getOverCapPreview/redistributeOverCap for auto-redistributing
  assignments when a juror's cap is lowered below their current load
- Add TransferAssignmentsDialog (2-step: select projects, pick destinations)
- Extend InlineMemberCap with over-cap detection and redistribute banner
- Extend getReassignmentHistory to show ASSIGNMENT_TRANSFER and CAP_REDISTRIBUTE events
- Learning hub: replace ResourceType/CohortLevel enums with accessJson JSONB,
  add coverImageKey, resource detail pages for jury/mentor, shared renderer
- Migration: 20260221200000_learning_hub_overhaul

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

src/components/shared/block-editor.tsx

@@ -2,9 +2,9 @@
 
 import { useEffect, useMemo, useState } from 'react'
 import { useCreateBlockNote } from '@blocknote/react'
-import { BlockNoteView } from '@blocknote/mantine'
+import { BlockNoteView } from '@blocknote/shadcn'
 import '@blocknote/core/fonts/inter.css'
-import '@blocknote/mantine/style.css'
+import '@blocknote/shadcn/style.css'
 
 import type { PartialBlock } from '@blocknote/core'
 

src/components/shared/resource-renderer.tsx

@@ -0,0 +1,71 @@
+'use client'
+
+import dynamic from 'next/dynamic'
+
+const BlockViewer = dynamic(
+  () => import('@/components/shared/block-editor').then((mod) => mod.BlockViewer),
+  {
+    ssr: false,
+    loading: () => (
+      <div className="min-h-[200px] rounded-lg border bg-muted/20 animate-pulse" />
+    ),
+  }
+)
+
+interface ResourceRendererProps {
+  title: string
+  description?: string | null
+  contentJson: unknown // BlockNote PartialBlock[] stored as JSON
+  coverImageUrl?: string | null
+  className?: string
+}
+
+export function ResourceRenderer({
+  title,
+  description,
+  contentJson,
+  coverImageUrl,
+  className,
+}: ResourceRendererProps) {
+  const contentString =
+    typeof contentJson === 'string' ? contentJson : JSON.stringify(contentJson)
+
+  return (
+    <article className={`mx-auto max-w-3xl ${className ?? ''}`}>
+      {/* Cover image */}
+      {coverImageUrl && (
+        <div className="mb-8 overflow-hidden rounded-lg">
+          <img
+            src={coverImageUrl}
+            alt=""
+            className="h-auto w-full object-cover"
+          />
+        </div>
+      )}
+
+      {/* Title */}
+      <h1 className="text-3xl font-bold tracking-tight text-foreground sm:text-4xl">
+        {title}
+      </h1>
+
+      {/* Description */}
+      {description && (
+        <p className="mt-3 text-lg text-muted-foreground leading-relaxed">
+          {description}
+        </p>
+      )}
+
+      {/* Divider */}
+      <hr className="my-6 border-border" />
+
+      {/* Content */}
+      {contentJson ? (
+        <div className="prose-renderer">
+          <BlockViewer content={contentString} />
+        </div>
+      ) : (
+        <p className="text-muted-foreground italic">No content</p>
+      )}
+    </article>
+  )
+}