feat: Persistente Sessions (PostgreSQL) + Spaltenerkennung (Step 3)

Sessions werden jetzt in PostgreSQL gespeichert statt in-memory.
Neue Session-Liste mit Name, Datum, Schritt. Sessions ueberleben
Browser-Refresh und Container-Neustart. Step 3 nutzt analyze_layout()
fuer automatische Spaltenerkennung mit farbigem Overlay.

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

admin-lehrer/components/ocr-pipeline/ColumnControls.tsx

@@ -0,0 +1,119 @@
+'use client'
+
+import { useState } from 'react'
+import type { ColumnResult, ColumnGroundTruth, PageRegion } from '@/app/(admin)/ai/ocr-pipeline/types'
+
+interface ColumnControlsProps {
+  columnResult: ColumnResult | null
+  onRerun: () => void
+  onGroundTruth: (gt: ColumnGroundTruth) => void
+  onNext: () => void
+  isDetecting: boolean
+}
+
+const TYPE_COLORS: Record<string, string> = {
+  column_en: 'bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-400',
+  column_de: 'bg-green-100 text-green-700 dark:bg-green-900/30 dark:text-green-400',
+  column_example: 'bg-orange-100 text-orange-700 dark:bg-orange-900/30 dark:text-orange-400',
+  header: 'bg-gray-100 text-gray-600 dark:bg-gray-700/50 dark:text-gray-400',
+  footer: 'bg-gray-100 text-gray-600 dark:bg-gray-700/50 dark:text-gray-400',
+}
+
+const TYPE_LABELS: Record<string, string> = {
+  column_en: 'EN',
+  column_de: 'DE',
+  column_example: 'Beispiel',
+  header: 'Header',
+  footer: 'Footer',
+}
+
+export function ColumnControls({ columnResult, onRerun, onGroundTruth, onNext, isDetecting }: ColumnControlsProps) {
+  const [gtSaved, setGtSaved] = useState(false)
+
+  if (!columnResult) return null
+
+  const columns = columnResult.columns.filter((c: PageRegion) => c.type.startsWith('column'))
+  const headerFooter = columnResult.columns.filter((c: PageRegion) => !c.type.startsWith('column'))
+
+  const handleGt = (isCorrect: boolean) => {
+    onGroundTruth({ is_correct: isCorrect })
+    setGtSaved(true)
+  }
+
+  return (
+    <div className="bg-white dark:bg-gray-800 rounded-xl border border-gray-200 dark:border-gray-700 p-4 space-y-4">
+      {/* Summary */}
+      <div className="flex items-center gap-3">
+        <div className="text-sm text-gray-600 dark:text-gray-400">
+          <span className="font-medium text-gray-800 dark:text-gray-200">{columns.length} Spalten</span> erkannt
+          {columnResult.duration_seconds > 0 && (
+            <span className="ml-2 text-xs">({columnResult.duration_seconds}s)</span>
+          )}
+        </div>
+        <button
+          onClick={onRerun}
+          disabled={isDetecting}
+          className="text-xs px-2 py-1 bg-gray-100 dark:bg-gray-700 rounded hover:bg-gray-200 dark:hover:bg-gray-600 transition-colors disabled:opacity-50"
+        >
+          Erneut erkennen
+        </button>
+      </div>
+
+      {/* Column list */}
+      <div className="space-y-2">
+        {columns.map((col: PageRegion, i: number) => (
+          <div key={i} className="flex items-center gap-3 text-sm">
+            <span className={`px-2 py-0.5 rounded text-xs font-medium ${TYPE_COLORS[col.type] || ''}`}>
+              {TYPE_LABELS[col.type] || col.type}
+            </span>
+            <span className="text-gray-500 dark:text-gray-400 text-xs font-mono">
+              x={col.x} y={col.y} {col.width}x{col.height}px
+            </span>
+          </div>
+        ))}
+        {headerFooter.map((r: PageRegion, i: number) => (
+          <div key={`hf-${i}`} className="flex items-center gap-3 text-sm">
+            <span className={`px-2 py-0.5 rounded text-xs font-medium ${TYPE_COLORS[r.type] || ''}`}>
+              {TYPE_LABELS[r.type] || r.type}
+            </span>
+            <span className="text-gray-500 dark:text-gray-400 text-xs font-mono">
+              x={r.x} y={r.y} {r.width}x{r.height}px
+            </span>
+          </div>
+        ))}
+      </div>
+
+      {/* Ground Truth + Navigation */}
+      <div className="flex items-center justify-between pt-2 border-t border-gray-100 dark:border-gray-700">
+        <div className="flex items-center gap-2">
+          <span className="text-sm text-gray-500 dark:text-gray-400">Spalten korrekt?</span>
+          {gtSaved ? (
+            <span className="text-xs text-green-600 dark:text-green-400">Gespeichert</span>
+          ) : (
+            <>
+              <button
+                onClick={() => handleGt(true)}
+                className="text-xs px-3 py-1 bg-green-100 text-green-700 dark:bg-green-900/30 dark:text-green-400 rounded hover:bg-green-200 dark:hover:bg-green-900/50 transition-colors"
+              >
+                Ja
+              </button>
+              <button
+                onClick={() => handleGt(false)}
+                className="text-xs px-3 py-1 bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-400 rounded hover:bg-red-200 dark:hover:bg-red-900/50 transition-colors"
+              >
+                Nein
+              </button>
+            </>
+          )}
+        </div>
+
+        <button
+          onClick={onNext}
+          className="px-4 py-2 bg-teal-600 text-white rounded-lg hover:bg-teal-700 transition-colors text-sm font-medium"
+        >
+          Weiter
+        </button>
+      </div>
+    </div>
+  )
+}