feat: wire maskedFileCount through eraser props

apps/web/src/lib/tool-registry.tsx

@@ -44,6 +44,7 @@ export interface EraserProps {
   brushSize: number;
   onBrushSizeChange: (size: number) => void;
   onMaskCenter?: (centerPct: number) => void;
+  maskedFileCount: number;
 }
 
 // ── Registry entry ─────────────────────────────────────────────────

apps/web/src/pages/tool-page.tsx

@@ -245,6 +245,7 @@ export function ToolPage() {
   const eraserRef = useRef<EraserCanvasRef | null>(null);
   const [eraserHasStrokes, setEraserHasStrokes] = useState(false);
   const [eraserBrushSize, setEraserBrushSize] = useState(30);
+  const [eraserMaskedCount, setEraserMaskedCount] = useState(0);
   // Center of the painted mask as a 0-100 percentage — used to init the slider at the right spot
   const [eraserSliderInitPos, setEraserSliderInitPos] = useState<number | null>(null);
 
@@ -267,6 +268,7 @@ export function ToolPage() {
     setCropShowGrid(true);
     setCropImgDimensions(null);
     setEraserHasStrokes(false);
+    setEraserMaskedCount(0);
     setEraserBrushSize(30);
     setEraserSliderInitPos(null);
     setMobileSettingsOpen(true);
@@ -422,6 +424,7 @@ export function ToolPage() {
             brushSize: eraserBrushSize,
             onBrushSizeChange: setEraserBrushSize,
             onMaskCenter: setEraserSliderInitPos,
+            maskedFileCount: eraserMaskedCount,
           }
         : undefined,
   };
@@ -507,6 +510,7 @@ export function ToolPage() {
           imageSrc={originalBlobUrl}
           brushSize={eraserBrushSize}
           onStrokeChange={setEraserHasStrokes}
+          onMaskedCountChange={setEraserMaskedCount}
         />
       );
     }