style(post mobile): improve buttons positioning, add Update and Auto buttons for clarity

src/components/post-form/post-form.tsx

@@ -449,7 +449,6 @@ const PostForm = () => {
               {showForm ? t('close_post_form') : isInPostView ? t('post_a_reply') : t('start_new_thread')}
             </button>
             {showForm && <PostFormTable closeForm={() => setShowForm(false)} postCid={postCid} />}
-            <hr />
           </>
         )}
       </div>