Fixes and improvements to the Profile Preview modal (#992)

* Fix: use more reliable navigation method

* Fix: show lightbox over the active modal

* Fix: close the profile preview on navigation

* Factor out UserPreviewLink and add preview behavior to notifications

* Fix postmeta overflow on web

* Fix lint

src/view/com/util/PostMeta.tsx

@@ -7,7 +7,7 @@ import {usePalette} from 'lib/hooks/usePalette'
 import {UserAvatar} from './UserAvatar'
 import {observer} from 'mobx-react-lite'
 import {sanitizeDisplayName} from 'lib/strings/display-names'
-import {isAndroid, isIOS} from 'platform/detection'
+import {isAndroid} from 'platform/detection'
 
 interface PostMetaOpts {
   authorAvatar?: string
@@ -88,6 +88,6 @@ const styles = StyleSheet.create({
   },
   maxWidth: {
     flex: isAndroid ? 1 : undefined,
-    maxWidth: isIOS ? '80%' : undefined,
+    maxWidth: !isAndroid ? '80%' : undefined,
   },
 })