Post layout tweaks (#53)

* Increase left margin on feed and embiggen avis

* Decrease feed margins a bit

* Tweak post bottom margin

* Update loading placeholder to match feed

* Update 'view full thread' positioning

* Update postthread to match feed layout

* Update notifications and individual post to match new layout

* Add missing aborted check

src/view/com/composer/ComposePost.tsx

@@ -117,6 +117,9 @@ export const ComposePost = observer(function ComposePost({
       })
         .catch(() => undefined)
         .then(localThumb => {
+          if (aborted) {
+            return
+          }
           setExtLink({
             ...extLink,
             isLoading: false, // done