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

@@ -2,9 +2,8 @@
 
 import { useCallback, useEffect, useState, useRef } from 'react'
 import { useSearchParams } from 'next/navigation'
-import type { PipelineStep, DocumentCategory } from './types'
+import type { PipelineStep, DocumentCategory, SessionListItem } from './types'
 import { KOMBI_V2_STEPS, dbStepToKombiV2Ui } from './types'
-import type { SessionListItem } from '../ocr-pipeline/types'
 
 export type { SessionListItem }