fix: OCR Kombi upload race condition — openSession was resetting step to 0

openSession mapped dbStep=1 to uiStep=0 (upload), overriding handleNext's
advancement to step 1. Fix: sessions always exist post-upload, so always
skip past the upload step in openSession.

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

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

@@ -154,8 +154,8 @@ export function useKombiPipeline() {
         uiStep = dbStepToKombiV2Ui(dbStep)
       }
 
-      // For sessions that already have an upload, skip the upload step
-      if (uiStep === 0 && dbStep >= 2) {
+      // Sessions only exist after upload, so always skip the upload step
+      if (uiStep === 0) {
         uiStep = 1
       }