fix: move Struktur step after OCR so word boxes are available for exclusion

Graphic detection needs word positions to exclude text from the ink mask.
Previously Struktur ran before OCR, causing every word to be detected as
a graphic element. Now:
- Pipeline: Struktur at index 7 (after Wörter)
- Kombi: Struktur at index 5 (after PP-OCRv5+Tesseract, before Tabelle)

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

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

@@ -76,12 +76,12 @@ export default function OcrOverlayPage() {
         setMode(m)
 
         // For Kombi: if grid_editor_result exists, jump to grid editor step (6)
-        // If word_result exists but no grid, jump to grid editor (6)
-        // If structure_result exists, jump to kombi step (5)
+        // If structure_result exists, jump to grid editor (6)
+        // If word_result exists, jump to structure step (5)
         const hasGrid = isKombi && data.grid_editor_result
-        const hasWords = isKombi && data.word_result
         const hasStructure = isKombi && data.structure_result
-        const activeStep = hasGrid ? 6 : hasWords ? 6 : hasStructure ? 5 : 4
+        const hasWords = isKombi && data.word_result
+        const activeStep = hasGrid ? 6 : hasStructure ? 6 : hasWords ? 5 : 4
         setSteps(
           baseSteps.map((s, i) => ({
             ...s,
@@ -252,22 +252,24 @@ export default function OcrOverlayPage() {
           return <StepCrop sessionId={sessionId} onNext={handleNext} />
         case 4:
           if (mode === 'kombi') {
-            return <StepStructureDetection sessionId={sessionId} onNext={handleNext} />
+            return (
+              <PaddleDirectStep
+                sessionId={sessionId}
+                onNext={handleNext}
+                endpoint="paddle-kombi"
+                title="Kombi-Modus"
+                description="PP-OCRv5 und Tesseract laufen parallel. Koordinaten werden gewichtet gemittelt fuer optimale Positionierung."
+                icon="🔀"
+                buttonLabel="PP-OCRv5 + Tesseract starten"
+                runningLabel="PP-OCRv5 + Tesseract laufen..."
+                engineKey="kombi"
+              />
+            )
           }
           return <PaddleDirectStep sessionId={sessionId} onNext={handleNext} />
         case 5:
           return mode === 'kombi' ? (
-            <PaddleDirectStep
-              sessionId={sessionId}
-              onNext={handleNext}
-              endpoint="paddle-kombi"
-              title="Kombi-Modus"
-              description="PP-OCRv5 und Tesseract laufen parallel. Koordinaten werden gewichtet gemittelt fuer optimale Positionierung."
-              icon="🔀"
-              buttonLabel="PP-OCRv5 + Tesseract starten"
-              runningLabel="PP-OCRv5 + Tesseract laufen..."
-              engineKey="kombi"
-            />
+            <StepStructureDetection sessionId={sessionId} onNext={handleNext} />
           ) : null
         case 6:
           return mode === 'kombi' ? (