refactor: improve checkbox styling and remove popup

- Update photo save checkbox to match app design (border-slate-600, htmlFor label)
- Remove success popup overlay - modal closes immediately after save
- Simplify confirmSingleItem to remove setTimeout logic
- Toast notification used for user feedback instead

frontend/hooks/useAIExtraction.ts

@@ -11,7 +11,6 @@ export function useAIExtraction(inventory: Item[], onComplete: (itemData: any) =
   const [mode, setMode] = useState<'item' | 'box'>('item');
   const [isLive, setIsLive] = useState(false);
   const [extractedImageBlob, setExtractedImageBlob] = useState<Blob | null>(null);
-  const [savingIndex, setSavingIndex] = useState<number | null>(null);
 
   const videoRef = useRef<HTMLVideoElement>(null);
   const canvasRef = useRef<HTMLCanvasElement>(null);
@@ -159,23 +158,17 @@ export function useAIExtraction(inventory: Item[], onComplete: (itemData: any) =
       })
     };
 
-    // Show success briefly before closing
-    setSavingIndex(index);
     onComplete(newItem);
 
-    // Reset UI after brief delay so user sees the success
-    setTimeout(() => {
-      if (extractedItems.length > 1) {
-        const remaining = [...extractedItems];
-        remaining.splice(index, 1);
-        setExtractedItems(remaining);
-        setEditingIndex(null);
-      } else {
-        setExtractedItems([]);
-        setEditingIndex(null);
-      }
-      setSavingIndex(null);
-    }, 1500);
+    if (extractedItems.length > 1) {
+      const remaining = [...extractedItems];
+      remaining.splice(index, 1);
+      setExtractedItems(remaining);
+      setEditingIndex(null);
+    } else {
+      setExtractedItems([]);
+      setEditingIndex(null);
+    }
   };
 
   const confirmAllItems = async () => {
@@ -263,7 +256,6 @@ export function useAIExtraction(inventory: Item[], onComplete: (itemData: any) =
     existingBoxes,
     extractedImageBlob,
     setExtractedImageBlob,
-    savingIndex,
     startLiveCamera,
     stopLiveCamera,
     captureSnapshot,