Close lightbox on web with escape key (#543)

* Close lightbox on web with escape key

* Lint

src/view/com/lightbox/Lightbox.web.tsx

@@ -1,4 +1,4 @@
-import React from 'react'
+import React, {useCallback, useEffect} from 'react'
 import {
   Image,
   TouchableOpacity,
@@ -73,6 +73,20 @@ function LightboxInner({
     }
   }
 
+  const onEscape = useCallback(
+    (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        onClose()
+      }
+    },
+    [onClose],
+  )
+
+  useEffect(() => {
+    window.addEventListener('keydown', onEscape)
+    return () => window.removeEventListener('keydown', onEscape)
+  }, [onEscape])
+
   return (
     <View style={styles.mask}>
       <TouchableWithoutFeedback onPress={onClose}>