fix: migrate ocr-pipeline types to ocr-kombi after page deletion

Types from deleted ocr-pipeline/types.ts inlined into ocr-kombi/types.ts.
All imports updated across components/ocr-kombi/ and components/ocr-pipeline/.

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

admin-lehrer/components/ocr-pipeline/usePixelWordPositions.ts

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react'
-import type { GridCell } from '@/app/(admin)/ai/ocr-pipeline/types'
+import type { GridCell } from '@/app/(admin)/ai/ocr-kombi/types'
 
 export interface WordPosition {
   xPct: number