scoped force-wrap to anchor links in articles and sidebar

.themes/classic/sass/partials/_blog.scss

@@ -1,7 +1,7 @@
 article {
   overflow: hidden;
   padding-top: 1em;
-  @extend force-wrap;
+  a { @extend .force-wrap; }
   header {
     position: relative;
     padding-top: 2em;

.themes/classic/sass/partials/sidebar/_base.scss

@@ -4,7 +4,7 @@
 aside[role=sidebar] {
   color: $sidebar-color;
   text-shadow: lighten($sidebar-bg, 8) 0 1px;
-  @extend .force-wrap;
+  a { @extend .force-wrap; }
   section {
     @extend .sans;
     font-size: .8em;