[Frontend] Manual re-do of collapse/expand panes

open #90
Refined positioning of .mini-tab elements when
panes are collapsed;

platform/commonUI/general/res/sass/mobile/_layout.scss

@@ -59,7 +59,7 @@
 // When the tree is hidden, these are the
     // classes used for the left menu and the
     // right representation.
-    .browse-hidetree {
+    .pane-tree-hidden {
         // Sets the left tree menu when the tree
         // is hidden.
         .pane.left.treeview {
@@ -70,7 +70,7 @@
         }
     }
     
-    .browse-showtree {
+    .pane-tree-showing {
         // NOTE: DISABLED SELECTION
         // Selection disabled in both panes
         // causing cut/copy/paste menu to
@@ -143,7 +143,7 @@
 }
 
 @include phonePortrait {
-    .browse-showtree {
+    .pane-tree-showing {
         .pane.left.treeview {
             width: $proporMenuOnly !important;
         }