fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

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

studio-v2/components/worksheet-editor/EditorToolbar.tsx

@@ -0,0 +1,312 @@
+'use client'
+
+import { useRef } from 'react'
+import { useTheme } from '@/lib/ThemeContext'
+import { useLanguage } from '@/lib/LanguageContext'
+import { useWorksheet } from '@/lib/worksheet-editor/WorksheetContext'
+import type { EditorTool } from '@/app/worksheet-editor/types'
+
+interface EditorToolbarProps {
+  onOpenAIGenerator: () => void
+  onOpenDocumentImporter: () => void
+  onOpenCleanupPanel?: () => void
+  className?: string
+}
+
+interface ToolButtonProps {
+  tool: EditorTool
+  icon: React.ReactNode
+  label: string
+  isActive: boolean
+  onClick: () => void
+  isDark: boolean
+}
+
+function ToolButton({ tool, icon, label, isActive, onClick, isDark }: ToolButtonProps) {
+  return (
+    <button
+      onClick={onClick}
+      title={label}
+      className={`w-12 h-12 flex items-center justify-center rounded-xl transition-all ${
+        isActive
+          ? isDark
+            ? 'bg-purple-500/30 text-purple-300 shadow-lg'
+            : 'bg-purple-100 text-purple-700 shadow-lg'
+          : isDark
+            ? 'text-white/70 hover:bg-white/10 hover:text-white'
+            : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900'
+      }`}
+    >
+      {icon}
+    </button>
+  )
+}
+
+export function EditorToolbar({ onOpenAIGenerator, onOpenDocumentImporter, onOpenCleanupPanel, className = '' }: EditorToolbarProps) {
+  const { isDark } = useTheme()
+  const { t } = useLanguage()
+  const fileInputRef = useRef<HTMLInputElement>(null)
+
+  const {
+    activeTool,
+    setActiveTool,
+    canvas,
+    canUndo,
+    canRedo,
+    undo,
+    redo,
+  } = useWorksheet()
+
+  const handleToolClick = (tool: EditorTool) => {
+    setActiveTool(tool)
+  }
+
+  const handleImageUpload = () => {
+    fileInputRef.current?.click()
+  }
+
+  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0]
+    if (!file || !canvas) return
+
+    const reader = new FileReader()
+    reader.onload = (event) => {
+      const url = event.target?.result as string
+      if ((canvas as any).addImage) {
+        (canvas as any).addImage(url)
+      }
+    }
+    reader.readAsDataURL(file)
+
+    // Reset input
+    e.target.value = ''
+  }
+
+  // Glassmorphism styles
+  const toolbarStyle = isDark
+    ? 'backdrop-blur-xl bg-white/10 border border-white/20'
+    : 'backdrop-blur-xl bg-white/70 border border-black/10 shadow-xl'
+
+  const dividerStyle = isDark
+    ? 'border-white/20'
+    : 'border-slate-200'
+
+  return (
+    <div className={`flex flex-col gap-2 p-2 rounded-2xl ${toolbarStyle} ${className}`}>
+      {/* Selection Tool */}
+      <ToolButton
+        tool="select"
+        isActive={activeTool === 'select'}
+        onClick={() => handleToolClick('select')}
+        isDark={isDark}
+        label="Auswählen"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M15 15l-2 5L9 9l11 4-5 2zm0 0l5 5M7.188 2.239l.777 2.897M5.136 7.965l-2.898-.777M13.95 4.05l-2.122 2.122m-5.657 5.656l-2.12 2.122" />
+          </svg>
+        }
+      />
+
+      <div className={`border-t ${dividerStyle}`} />
+
+      {/* Text Tool */}
+      <ToolButton
+        tool="text"
+        isActive={activeTool === 'text'}
+        onClick={() => handleToolClick('text')}
+        isDark={isDark}
+        label="Text"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M11 5H6a2 2 0 00-2 2v11a2 2 0 002 2h11a2 2 0 002-2v-5m-1.414-9.414a2 2 0 112.828 2.828L11.828 15H9v-2.828l8.586-8.586z" />
+          </svg>
+        }
+      />
+
+      <div className={`border-t ${dividerStyle}`} />
+
+      {/* Shape Tools */}
+      <ToolButton
+        tool="rectangle"
+        isActive={activeTool === 'rectangle'}
+        onClick={() => handleToolClick('rectangle')}
+        isDark={isDark}
+        label="Rechteck"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 6h16M4 18h16M4 6v12M20 6v12" />
+          </svg>
+        }
+      />
+
+      <ToolButton
+        tool="circle"
+        isActive={activeTool === 'circle'}
+        onClick={() => handleToolClick('circle')}
+        isDark={isDark}
+        label="Kreis"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <circle cx="12" cy="12" r="9" strokeWidth={1.5} />
+          </svg>
+        }
+      />
+
+      <ToolButton
+        tool="line"
+        isActive={activeTool === 'line'}
+        onClick={() => handleToolClick('line')}
+        isDark={isDark}
+        label="Linie"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 20L20 4" />
+          </svg>
+        }
+      />
+
+      <ToolButton
+        tool="arrow"
+        isActive={activeTool === 'arrow'}
+        onClick={() => handleToolClick('arrow')}
+        isDark={isDark}
+        label="Pfeil"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M17 8l4 4m0 0l-4 4m4-4H3" />
+          </svg>
+        }
+      />
+
+      <div className={`border-t ${dividerStyle}`} />
+
+      {/* Image Tools */}
+      <ToolButton
+        tool="image"
+        isActive={activeTool === 'image'}
+        onClick={handleImageUpload}
+        isDark={isDark}
+        label="Bild hochladen"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
+          </svg>
+        }
+      />
+
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept="image/*"
+        onChange={handleFileChange}
+        className="hidden"
+      />
+
+      {/* AI Image Generator */}
+      <ToolButton
+        tool="ai-image"
+        isActive={activeTool === 'ai-image'}
+        onClick={onOpenAIGenerator}
+        isDark={isDark}
+        label="KI-Bild generieren"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M5 3v4M3 5h4M6 17v4m-2-2h4m5-16l2.286 6.857L21 12l-5.714 2.143L13 21l-2.286-6.857L5 12l5.714-2.143L13 3z" />
+          </svg>
+        }
+      />
+
+      <div className={`border-t ${dividerStyle}`} />
+
+      {/* Document Import */}
+      <button
+        onClick={onOpenDocumentImporter}
+        title="Dokument importieren"
+        className={`w-12 h-12 flex items-center justify-center rounded-xl transition-all ${
+          isDark
+            ? 'text-blue-300 hover:bg-blue-500/20 hover:text-blue-200'
+            : 'text-blue-600 hover:bg-blue-100 hover:text-blue-700'
+        }`}
+      >
+        <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M12 3v6a1 1 0 001 1h6" />
+        </svg>
+      </button>
+
+      {/* Cleanup Panel - Handwriting Removal */}
+      {onOpenCleanupPanel && (
+        <button
+          onClick={onOpenCleanupPanel}
+          title="Arbeitsblatt bereinigen (Handschrift entfernen)"
+          className={`w-12 h-12 flex items-center justify-center rounded-xl transition-all ${
+            isDark
+              ? 'text-orange-300 hover:bg-orange-500/20 hover:text-orange-200'
+              : 'text-orange-600 hover:bg-orange-100 hover:text-orange-700'
+          }`}
+        >
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M19.428 15.428a2 2 0 00-1.022-.547l-2.387-.477a6 6 0 00-3.86.517l-.318.158a6 6 0 01-3.86.517L6.05 15.21a2 2 0 00-1.806.547M8 4h8l-1 1v5.172a2 2 0 00.586 1.414l5 5c1.26 1.26.367 3.414-1.415 3.414H4.828c-1.782 0-2.674-2.154-1.414-3.414l5-5A2 2 0 009 10.172V5L8 4z" />
+          </svg>
+        </button>
+      )}
+
+      <div className={`border-t ${dividerStyle}`} />
+
+      {/* Table Tool */}
+      <ToolButton
+        tool="table"
+        isActive={activeTool === 'table'}
+        onClick={() => handleToolClick('table')}
+        isDark={isDark}
+        label="Tabelle"
+        icon={
+          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M3 10h18M3 14h18m-9-4v8m-7 0h14a2 2 0 002-2V8a2 2 0 00-2-2H5a2 2 0 00-2 2v8a2 2 0 002 2z" />
+          </svg>
+        }
+      />
+
+      <div className={`border-t ${dividerStyle} mt-auto`} />
+
+      {/* Undo/Redo */}
+      <button
+        onClick={undo}
+        disabled={!canUndo}
+        title="Rückgängig (Ctrl+Z)"
+        className={`w-12 h-12 flex items-center justify-center rounded-xl transition-all ${
+          canUndo
+            ? isDark
+              ? 'text-white/70 hover:bg-white/10 hover:text-white'
+              : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900'
+            : isDark
+              ? 'text-white/30 cursor-not-allowed'
+              : 'text-slate-300 cursor-not-allowed'
+        }`}
+      >
+        <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M3 10h10a8 8 0 018 8v2M3 10l6 6m-6-6l6-6" />
+        </svg>
+      </button>
+
+      <button
+        onClick={redo}
+        disabled={!canRedo}
+        title="Wiederholen (Ctrl+Y)"
+        className={`w-12 h-12 flex items-center justify-center rounded-xl transition-all ${
+          canRedo
+            ? isDark
+              ? 'text-white/70 hover:bg-white/10 hover:text-white'
+              : 'text-slate-600 hover:bg-slate-100 hover:text-slate-900'
+            : isDark
+              ? 'text-white/30 cursor-not-allowed'
+              : 'text-slate-300 cursor-not-allowed'
+        }`}
+      >
+        <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M21 10h-10a8 8 0 00-8 8v2M21 10l-6 6m6-6l-6-6" />
+        </svg>
+      </button>
+    </div>
+  )
+}