refactor: rename PaddleOCR → PP-OCRv5 in frontend, remove Kombi-Vergleich tab

Since ocr_region_paddle() now runs RapidOCR locally (same PP-OCRv5 models),
the "PaddleOCR (Hetzner)" labels were misleading. Renamed to "PP-OCRv5 (lokal)".
Removed the Kombi-Vergleich tab since both sides would produce identical results.

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

admin-lehrer/app/(admin)/ai/ocr-overlay/page.tsx

@@ -11,13 +11,12 @@ import { StepRowDetection } from '@/components/ocr-pipeline/StepRowDetection'
 import { StepWordRecognition } from '@/components/ocr-pipeline/StepWordRecognition'
 import { OverlayReconstruction } from '@/components/ocr-overlay/OverlayReconstruction'
 import { PaddleDirectStep } from '@/components/ocr-overlay/PaddleDirectStep'
-import { KombiCompareStep } from '@/components/ocr-overlay/KombiCompareStep'
-import { OVERLAY_PIPELINE_STEPS, PADDLE_DIRECT_STEPS, KOMBI_STEPS, KOMBI_COMPARE_STEPS, DOCUMENT_CATEGORIES, dbStepToOverlayUi, type PipelineStep, type SessionListItem, type DocumentCategory } from './types'
+import { OVERLAY_PIPELINE_STEPS, PADDLE_DIRECT_STEPS, KOMBI_STEPS, DOCUMENT_CATEGORIES, dbStepToOverlayUi, type PipelineStep, type SessionListItem, type DocumentCategory } from './types'
 
 const KLAUSUR_API = '/klausur-api'
 
 export default function OcrOverlayPage() {
-  const [mode, setMode] = useState<'pipeline' | 'paddle-direct' | 'kombi' | 'kombi-compare'>('pipeline')
+  const [mode, setMode] = useState<'pipeline' | 'paddle-direct' | 'kombi'>('pipeline')
   const [currentStep, setCurrentStep] = useState(0)
   const [sessionId, setSessionId] = useState<string | null>(null)
   const [sessionName, setSessionName] = useState<string>('')
@@ -67,12 +66,11 @@ export default function OcrOverlayPage() {
       // Check if this session was processed with paddle_direct, kombi, or rapid_kombi
       const ocrEngine = data.word_result?.ocr_engine
       const isPaddleDirect = ocrEngine === 'paddle_direct'
-      const isKombi = ocrEngine === 'kombi'
-      const isRapidKombi = ocrEngine === 'rapid_kombi'
+      const isKombi = ocrEngine === 'kombi' || ocrEngine === 'rapid_kombi'
 
-      if (isPaddleDirect || isKombi || isRapidKombi) {
-        const m = isKombi ? 'kombi' : isPaddleDirect ? 'paddle-direct' : 'kombi-compare'
-        const baseSteps = isKombi ? KOMBI_STEPS : isRapidKombi ? KOMBI_COMPARE_STEPS : PADDLE_DIRECT_STEPS
+      if (isPaddleDirect || isKombi) {
+        const m = isKombi ? 'kombi' : 'paddle-direct'
+        const baseSteps = isKombi ? KOMBI_STEPS : PADDLE_DIRECT_STEPS
         setMode(m)
         setSteps(
           baseSteps.map((s, i) => ({
@@ -107,7 +105,7 @@ export default function OcrOverlayPage() {
       if (sessionId === sid) {
         setSessionId(null)
         setCurrentStep(0)
-        const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'kombi-compare' ? KOMBI_COMPARE_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
+        const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
         setSteps(baseSteps.map((s, i) => ({ ...s, status: i === 0 ? 'active' : 'pending' })))
       }
     } catch (e) {
@@ -164,7 +162,7 @@ export default function OcrOverlayPage() {
   const handleNext = () => {
     if (currentStep >= steps.length - 1) {
       // Last step completed — return to session list
-      const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'kombi-compare' ? KOMBI_COMPARE_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
+      const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
       setSteps(baseSteps.map((s, i) => ({ ...s, status: i === 0 ? 'active' : 'pending' })))
       setCurrentStep(0)
       setSessionId(null)
@@ -193,7 +191,7 @@ export default function OcrOverlayPage() {
     setSessionId(null)
     setSessionName('')
     setCurrentStep(0)
-    const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'kombi-compare' ? KOMBI_COMPARE_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
+    const baseSteps = mode === 'kombi' ? KOMBI_STEPS : mode === 'paddle-direct' ? PADDLE_DIRECT_STEPS : OVERLAY_PIPELINE_STEPS
     setSteps(baseSteps.map((s, i) => ({ ...s, status: i === 0 ? 'active' : 'pending' })))
   }
 
@@ -232,7 +230,7 @@ export default function OcrOverlayPage() {
   }, [sessionId, goToStep])
 
   const renderStep = () => {
-    if (mode === 'paddle-direct' || mode === 'kombi' || mode === 'kombi-compare') {
+    if (mode === 'paddle-direct' || mode === 'kombi') {
       switch (currentStep) {
         case 0:
           return <StepOrientation sessionId={sessionId} onNext={handleOrientationComplete} />
@@ -243,19 +241,16 @@ export default function OcrOverlayPage() {
         case 3:
           return <StepCrop sessionId={sessionId} onNext={handleNext} />
         case 4:
-          if (mode === 'kombi-compare') {
-            return <KombiCompareStep sessionId={sessionId} onNext={handleNext} />
-          }
           return mode === 'kombi' ? (
             <PaddleDirectStep
               sessionId={sessionId}
               onNext={handleNext}
               endpoint="paddle-kombi"
               title="Kombi-Modus"
-              description="PaddleOCR und Tesseract laufen parallel. Koordinaten werden gewichtet gemittelt fuer optimale Positionierung."
+              description="PP-OCRv5 und Tesseract laufen parallel. Koordinaten werden gewichtet gemittelt fuer optimale Positionierung."
               icon="🔀"
-              buttonLabel="Paddle + Tesseract starten"
-              runningLabel="Paddle + Tesseract laufen..."
+              buttonLabel="PP-OCRv5 + Tesseract starten"
+              runningLabel="PP-OCRv5 + Tesseract laufen..."
               engineKey="kombi"
             />
           ) : (
@@ -501,7 +496,7 @@ export default function OcrOverlayPage() {
               : 'text-gray-500 dark:text-gray-400 hover:text-gray-700 dark:hover:text-gray-300'
           }`}
         >
-          Paddle Direct (5 Schritte)
+          PP-OCRv5 Direct (5 Schritte)
         </button>
         <button
           onClick={() => {
@@ -519,22 +514,6 @@ export default function OcrOverlayPage() {
         >
           Kombi (5 Schritte)
         </button>
-        <button
-          onClick={() => {
-            if (mode === 'kombi-compare') return
-            setMode('kombi-compare')
-            setCurrentStep(0)
-            setSessionId(null)
-            setSteps(KOMBI_COMPARE_STEPS.map((s, i) => ({ ...s, status: i === 0 ? 'active' : 'pending' })))
-          }}
-          className={`px-3 py-1.5 text-xs font-medium rounded-md transition-colors ${
-            mode === 'kombi-compare'
-              ? 'bg-white dark:bg-gray-700 text-gray-700 dark:text-gray-200 shadow-sm'
-              : 'text-gray-500 dark:text-gray-400 hover:text-gray-700 dark:hover:text-gray-300'
-          }`}
-        >
-          Vergleich (5 Schritte)
-        </button>
       </div>
 
       <PipelineStepper

admin-lehrer/app/(admin)/ai/ocr-overlay/types.ts

@@ -57,11 +57,11 @@ export const PADDLE_DIRECT_STEPS: PipelineStep[] = [
   { id: 'deskew', name: 'Begradigung', icon: '📐', status: 'pending' },
   { id: 'dewarp', name: 'Entzerrung', icon: '🔧', status: 'pending' },
   { id: 'crop', name: 'Zuschneiden', icon: '✂️', status: 'pending' },
-  { id: 'paddle-direct', name: 'PaddleOCR + Overlay', icon: '⚡', status: 'pending' },
+  { id: 'paddle-direct', name: 'PP-OCRv5 + Overlay', icon: '⚡', status: 'pending' },
 ]
 
 /**
- * 5-step pipeline for Kombi mode (PaddleOCR + Tesseract).
+ * 5-step pipeline for Kombi mode (PP-OCRv5 + Tesseract).
  * Same preprocessing, then both engines run and results are merged.
  */
 export const KOMBI_STEPS: PipelineStep[] = [
@@ -69,19 +69,7 @@ export const KOMBI_STEPS: PipelineStep[] = [
   { id: 'deskew', name: 'Begradigung', icon: '📐', status: 'pending' },
   { id: 'dewarp', name: 'Entzerrung', icon: '🔧', status: 'pending' },
   { id: 'crop', name: 'Zuschneiden', icon: '✂️', status: 'pending' },
-  { id: 'kombi', name: 'Paddle + Tesseract', icon: '🔀', status: 'pending' },
-]
-
-/**
- * 5-step pipeline for Kombi-Vergleich mode (Paddle-Kombi vs Rapid-Kombi side-by-side).
- * Same preprocessing, then both kombi engines run in parallel and are shown side-by-side.
- */
-export const KOMBI_COMPARE_STEPS: PipelineStep[] = [
-  { id: 'orientation', name: 'Orientierung', icon: '🔄', status: 'pending' },
-  { id: 'deskew', name: 'Begradigung', icon: '📐', status: 'pending' },
-  { id: 'dewarp', name: 'Entzerrung', icon: '🔧', status: 'pending' },
-  { id: 'crop', name: 'Zuschneiden', icon: '✂️', status: 'pending' },
-  { id: 'kombi-compare', name: 'Kombi-Vergleich', icon: '⚖️', status: 'pending' },
+  { id: 'kombi', name: 'PP-OCRv5 + Tesseract', icon: '🔀', status: 'pending' },
 ]
 
 /** Map from DB step to overlay UI step index */

admin-lehrer/components/ocr-overlay/PaddleDirectStep.tsx

@@ -30,11 +30,11 @@ export function PaddleDirectStep({
   sessionId,
   onNext,
   endpoint = 'paddle-direct',
-  title = 'Paddle Direct',
-  description = 'PaddleOCR erkennt alle Woerter direkt auf dem Originalbild — ohne Begradigung, Entzerrung oder Zuschnitt.',
+  title = 'PP-OCRv5 Direct',
+  description = 'PP-OCRv5 (lokal via RapidOCR) erkennt alle Woerter direkt auf dem Originalbild — ohne Begradigung, Entzerrung oder Zuschnitt.',
   icon = '⚡',
-  buttonLabel = 'PaddleOCR starten',
-  runningLabel = 'PaddleOCR laeuft...',
+  buttonLabel = 'PP-OCRv5 starten',
+  runningLabel = 'PP-OCRv5 laeuft...',
   engineKey = 'paddle_direct',
 }: PaddleDirectStepProps) {
   const [phase, setPhase] = useState<Phase>('idle')

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

@@ -108,7 +108,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
     setGridResult(null)
 
     try {
-      // PaddleOCR forces words_first on the backend, so align frontend accordingly
+      // PP-OCRv5 forces words_first on the backend, so align frontend accordingly
       const effectiveGridMethod = eng === 'paddle' ? 'words_first' : gridMethod
       const useStream = effectiveGridMethod === 'v2'
 
@@ -133,7 +133,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
         throw new Error(err.detail || 'Worterkennung fehlgeschlagen')
       }
 
-      // words_first / paddle returns plain JSON (no streaming)
+      // words_first / pp-ocrv5 returns plain JSON (no streaming)
       if (!useStream) {
         const data = await res.json() as GridResult
         applyGridResult(data)
@@ -820,7 +820,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
               <option value="auto">Auto (RapidOCR wenn verfuegbar)</option>
               <option value="rapid">RapidOCR (ONNX)</option>
               <option value="tesseract">Tesseract</option>
-              <option value="paddle">PaddleOCR (Hetzner)</option>
+              <option value="paddle">PP-OCRv5 (lokal)</option>
             </select>
 
             {/* Pronunciation selector (only for vocab) */}
@@ -846,13 +846,11 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
             {/* Show which engine was used */}
             {usedEngine && (
               <span className={`px-2 py-0.5 rounded text-[10px] uppercase font-semibold ${
-                usedEngine === 'rapid'
+                usedEngine === 'rapid' || usedEngine === 'paddle'
                   ? 'bg-purple-100 dark:bg-purple-900/30 text-purple-700 dark:text-purple-300'
-                  : usedEngine === 'paddle'
-                  ? 'bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-300'
                   : 'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-400'
               }`}>
-                {usedEngine}
+                {usedEngine === 'paddle' ? 'pp-ocrv5' : usedEngine}
               </span>
             )}