fix: show real image dimensions in right pane for DNG/RAW files

The preview endpoint now returns X-Original-Width/Height headers with
dimensions read from Sharp metadata (or ExifTool for RAW files). The
frontend stores these in FileEntry and the ImageViewer prefers them over
the browser's naturalWidth/naturalHeight, which reflects the resized
preview rather than the original sensor dimensions.

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

@@ -631,6 +631,8 @@ export function ToolPage() {
           src={originalBlobUrl}
           filename={fname}
           fileSize={fsize}
+          originalWidth={currentEntry?.originalWidth}
+          originalHeight={currentEntry?.originalHeight}
           {...(isLivePreview && previewTransform
             ? {
                 cssRotate: previewTransform.rotate,