Resolve all remaining lint issues (#88)

* Rework 'navIdx' variables from number arrays to strings to avoid equality-check failures in react hooks

* Resolve all remaining lint issues

* Fix tests

* Use node v18 in gh action test

src/view/com/util/PostEmbeds.tsx

@@ -67,7 +67,7 @@ export function PostEmbeds({
             <AutoSizedImage
               uri={embed.images[0].thumb}
               onPress={() => openLightbox(0)}
-              containerStyle={{borderRadius: 8}}
+              containerStyle={styles.singleImage}
             />
           </View>
         )
@@ -120,6 +120,9 @@ const styles = StyleSheet.create({
   imagesContainer: {
     marginTop: 4,
   },
+  singleImage: {
+    borderRadius: 8,
+  },
   extOuter: {
     borderWidth: 1,
     borderRadius: 8,