Add gutter repair step to OCR Kombi pipeline

New step "Wortkorrektur" between Grid-Review and Ground Truth that detects
and fixes words truncated or blurred at the book gutter (binding area) of
double-page scans. Uses pyspellchecker (DE+EN) for validation.

Two repair strategies:
- hyphen_join: words split across rows with missing chars (ve + künden → verkünden)
- spell_fix: garbled trailing chars from gutter blur (stammeli → stammeln)

Interactive frontend with per-suggestion accept/reject and batch controls.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-lehrer/app/(admin)/ai/ocr-kombi/useKombiPipeline.ts

@@ -129,9 +129,12 @@ export function useKombiPipeline() {
       const hasGrid = !!data.grid_editor_result
       const hasStructure = !!data.structure_result
       const hasWords = !!data.word_result
+      const hasGutterRepair = !!(data.ground_truth?.gutter_repair)
 
       let uiStep: number
-      if (hasGrid) {
+      if (hasGrid && hasGutterRepair) {
+        uiStep = 10 // gutter-repair (already analysed)
+      } else if (hasGrid) {
         uiStep = 9 // grid-review
       } else if (hasStructure) {
         uiStep = 8 // grid-build