fix: modal actually processes image with rotation/crop and fixes zoom

Critical fixes:
1. Modal now applies rotation and crop to image, returns processed blob
2. Frontend sends processed image to backend (not original)
3. Zoom slider min/max now calculated based on image size
4. Initial zoom shows entire image in canvas
5. Zoom constraints prevent over-zooming or under-zooming

User experience improved:
- Sees full item at start (auto-fit zoom)
- Can adjust rotation/crop smoothly
- Adjusted image is what gets saved (not original)
- Zoom slider works correctly for any image size

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

frontend/components/AIOnboarding.tsx

@@ -60,13 +60,12 @@ export default function AIOnboarding({ onCancel, onComplete, categories, invento
     setShowImageAdjustment(true);
   };
 
-  const handleImageAdjustmentConfirm = async (adjustments: { rotation: number; cropBounds: { x: number; y: number; width: number; height: number } } | null) => {
+  const handleImageAdjustmentConfirm = async (adjustments: any) => {
     if (!pendingItemData) return;
 
     const { index } = pendingItemData;
 
     if (adjustments && extractedItems[index]) {
-      // Override AI-detected values with user adjustments
       const updatedItems = [...extractedItems];
       updatedItems[index] = {
         ...updatedItems[index],
@@ -82,11 +81,27 @@ export default function AIOnboarding({ onCancel, onComplete, categories, invento
           user_adjusted: true
         }
       };
-      setExtractedItems(updatedItems);
+
+      // If modal processed and returned image blob, use that instead of original
+      if (adjustments.imageBlob) {
+        // Convert blob to base64 for extracted_image_bytes
+        const reader = new FileReader();
+        reader.onload = () => {
+          const base64 = (reader.result as string).split(',')[1];
+          updatedItems[index].extractedImageBlob = adjustments.imageBlob;
+          updatedItems[index]._base64ImageData = base64;
+          setExtractedItems(updatedItems);
+          hookConfirmSingleItem(index);
+        };
+        reader.readAsDataURL(adjustments.imageBlob);
+      } else {
+        setExtractedItems(updatedItems);
+        hookConfirmSingleItem(index);
+      }
+    } else {
+      hookConfirmSingleItem(index);
     }
 
-    // Now call the hook's confirm with the updated data
-    hookConfirmSingleItem(index);
     setShowImageAdjustment(false);
     setAdjustingItemIndex(null);
     setPendingItemData(null);

frontend/components/ImageAdjustmentModal.tsx

@@ -5,13 +5,15 @@ import { X, RotateCw } from 'lucide-react';
 
 interface ImageAdjustmentModalProps {
   imageUrl: string;
-  onConfirm: (adjustedImage: { rotation: number; cropBounds: { x: number; y: number; width: number; height: number } } | null) => void;
+  onConfirm: (adjustedImage: { rotation: number; cropBounds: { x: number; y: number; width: number; height: number }; imageBlob?: Blob } | null) => void;
   onCancel: () => void;
 }
 
 export function ImageAdjustmentModal({ imageUrl, onConfirm, onCancel }: ImageAdjustmentModalProps) {
   const [rotation, setRotation] = useState(0);
   const [zoom, setZoom] = useState(1);
+  const [minZoom, setMinZoom] = useState(0.1);
+  const [maxZoom, setMaxZoom] = useState(5);
   const [panX, setPanX] = useState(0);
   const [panY, setPanY] = useState(0);
   const [useImage, setUseImage] = useState(true);
@@ -51,8 +53,9 @@ export function ImageAdjustmentModal({ imageUrl, onConfirm, onCancel }: ImageAdj
       const canvasHeight = 600;
       const zoomX = canvasWidth / img.width;
       const zoomY = canvasHeight / img.height;
-      const fitZoom = Math.min(zoomX, zoomY, 1); // Don't zoom in, only out to fit
+      const fitZoom = Math.min(zoomX, zoomY); // Allow any zoom needed to fit
-      setZoom(fitZoom);
+      setMinZoom(fitZoom); // Min zoom shows entire image
+      setZoom(fitZoom); // Start at fit level
     };
     img.src = imageUrl;
   }, [imageUrl]);
@@ -115,18 +118,45 @@ export function ImageAdjustmentModal({ imageUrl, onConfirm, onCancel }: ImageAdj
     }
   };
 
-  const handleConfirm = () => {
+  const handleConfirm = async () => {
-    if (useImage && cropBounds) {
+    if (!useImage || !cropBounds || !imageRef.current) {
-      onConfirm({ rotation, cropBounds });
-    } else {
       onConfirm(null);
+      return;
     }
+
+    // Process image: apply rotation and crop
+    const processCanvas = document.createElement('canvas');
+    const ctx = processCanvas.getContext('2d');
+    if (!ctx) return;
+
+    const { x, y, width, height } = cropBounds;
+
+    // Set canvas to crop dimensions
+    processCanvas.width = width;
+    processCanvas.height = height;
+
+    // Apply rotation around crop center and crop
+    ctx.save();
+    ctx.translate(width / 2, height / 2);
+    ctx.rotate((rotation * Math.PI) / 180);
+    ctx.translate(-imageDimensions.width / 2 + x, -imageDimensions.height / 2 + y);
+    ctx.drawImage(imageRef.current, 0, 0);
+    ctx.restore();
+
+    // Convert to blob
+    processCanvas.toBlob((blob) => {
+      if (blob) {
+        onConfirm({ rotation, cropBounds, imageBlob: blob });
+      } else {
+        onConfirm({ rotation, cropBounds });
+      }
+    }, 'image/jpeg', 0.95);
   };
 
   const handleWheel = (e: React.WheelEvent<HTMLCanvasElement>) => {
     e.preventDefault();
     const delta = e.deltaY > 0 ? 0.9 : 1.1;
-    setZoom(prev => Math.max(0.5, Math.min(5, prev * delta)));
+    setZoom(prev => Math.max(minZoom, Math.min(maxZoom, prev * delta)));
   };
 
   const getTouchDistance = (touches: React.TouchList) => {
@@ -154,7 +184,7 @@ export function ImageAdjustmentModal({ imageUrl, onConfirm, onCancel }: ImageAdj
       const newDistance = getTouchDistance(e.touches);
       if (lastTouchDistance > 0) {
         const delta = newDistance / lastTouchDistance;
-        setZoom(prev => Math.max(0.5, Math.min(5, prev * delta)));
+        setZoom(prev => Math.max(minZoom, Math.min(maxZoom, prev * delta)));
         setLastTouchDistance(newDistance);
       }
     } else if (e.touches.length === 1 && isPanning) {
@@ -213,8 +243,8 @@ export function ImageAdjustmentModal({ imageUrl, onConfirm, onCancel }: ImageAdj
               </label>
               <input
                 type="range"
-                min="0.5"
+                min={minZoom}
-                max="5"
+                max={maxZoom}
                 step="0.1"
                 value={zoom}
                 onChange={(e) => setZoom(Number(e.target.value))}