fix: advance uiStep past skipped orientation for page-split sub-sessions

Page-split sub-sessions (current_step=2) had orientation marked as skipped
but uiStep remained at 0 (orientation step), causing StepOrientation to
render for a sub-session that has no orientation data. Now advances to
uiStep=1 (deskew) when orientation is skipped.

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

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

@@ -136,6 +136,7 @@ export default function OcrOverlayPage() {
             if (uiStep < 4) uiStep = 4
           } else if (dbStep >= 2) {
             skipIds.push('orientation')
+            if (uiStep < 1) uiStep = 1 // advance past skipped orientation to deskew
           }
         }
       }

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

@@ -108,6 +108,7 @@ export default function OcrPipelinePage() {
         } else if (dbStep >= 2) {
           // Page-split sub-session: parent orientation applied, skip only orientation
           if (!skipSteps.includes('orientation')) skipSteps.push('orientation')
+          if (uiStep < 1) uiStep = 1 // advance past skipped orientation to deskew
         }
         // dbStep === 1: page-split from original image, needs full pipeline
       }