chore/limit what file types can be added

src/components/cardSelector/ImageCardButton.tsx

@@ -8,6 +8,9 @@ export function ImageCardButton() {
   function _handleClick(mouseEvent: MouseEvent) {
     const input = document.createElement('input')
     input.type = 'file'
+    input.accept = ".png,.jpg,.webp,.jpeg"
+    input.multiple = false
+
     input.onchange = (e: any) => {
       const file = e.target.files[0]
       const reader = new FileReader()