fix: Sub-Sessions starten direkt bei Spalten, ueberspringe Vorverarbeitung

Box-Sub-Sessions haben bereits ein zugeschnittenes Bild. Orientierung,
Begradigung, Entzerrung und Crop werden uebersprungen (skipped).

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

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

@@ -88,8 +88,19 @@ export default function OcrPipelinePage() {
       const dbStep = data.current_step || 1
       // DB steps: 1=start, 2=orientation, 3=deskew, 4=dewarp, 5=crop, 6=columns, ...
       // UI steps are 0-indexed: 0=orientation, 1=deskew, 2=dewarp, 3=crop, 4=columns, ...
-      const uiStep = Math.max(0, dbStep - 1)
-      const skipSteps = savedDocType?.skip_steps || []
+      let uiStep = Math.max(0, dbStep - 1)
+      const skipSteps = [...(savedDocType?.skip_steps || [])]
+
+      // Sub-sessions: image is already cropped, skip pre-processing steps
+      // Jump directly to columns (UI step 4) unless already further ahead
+      const isSubSession = !!data.parent_session_id
+      const SUB_SESSION_SKIP = ['orientation', 'deskew', 'dewarp', 'crop']
+      if (isSubSession) {
+        for (const s of SUB_SESSION_SKIP) {
+          if (!skipSteps.includes(s)) skipSteps.push(s)
+        }
+        if (uiStep < 4) uiStep = 4 // columns step
+      }
 
       setSteps(
         PIPELINE_STEPS.map((s, i) => ({