fix: dewarp UI shows detection details, quality gate status, confidence bars

- Add DewarpDetection type with per-method results
- Expand method labels for all 4 detectors (A-D)
- Show green/amber banner: applied vs quality-gate-rejected
- Expandable "Details" panel showing all 4 methods with confidence bars
- Visual confidence bars instead of plain percentage

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

admin-lehrer/app/(admin)/ai/ocr-pipeline/types.ts

@@ -50,13 +50,20 @@ export interface DeskewGroundTruth {
   notes?: string
 }
 
+export interface DewarpDetection {
+  method: string
+  shear_degrees: number
+  confidence: number
+}
+
 export interface DewarpResult {
   session_id: string
-  method_used: 'vertical_edge' | 'manual' | 'none'
+  method_used: string
   shear_degrees: number
   confidence: number
   duration_seconds: number
   dewarped_image_url: string
+  detections?: DewarpDetection[]
 }
 
 export interface DewarpGroundTruth {