UI improvements

* Implement visibility choice on board creation;

* Rework the board header bar. Remove links to un-implemented
features;

* Implement a board star counter (visible if the board have >2 stars);

* Define a new icon (a thin cross) to close elements;

* Remove $(document).on('mouseover') event handlers that were
basically fired hundreds of times for nothing, we now define a proper
Tracker dependency to execute jquery-ui plugin initialization only
when something has changed;

* Bug fixes related to list scrolling.

client/components/boards/boardBody.js

@@ -0,0 +1,141 @@
+// XXX This event list must be abstracted somewhere else.
+var endTransitionEvents = [
+  'webkitTransitionEnd',
+  'otransitionend',
+  'oTransitionEnd',
+  'msTransitionEnd',
+  'transitionend'
+].join(' ');
+
+BlazeComponent.extendComponent({
+  template: function() {
+    return 'boardComponent';
+  },
+
+  openNewListForm: function() {
+    this.componentChildren('addListForm')[0].open();
+  },
+
+  showNewCardForms: function(value) {
+    _.each(this.componentChildren('list'), function(listComponent) {
+      listComponent.showNewCardForm(value);
+    });
+  },
+
+  scrollLeft: function(position) {
+    position = position || 0;
+    var $container = $(this.find('.js-lists'));
+    var containerWidth = $container.width();
+    var currentScrollPosition = $container.scrollLeft();
+    if (position < currentScrollPosition) {
+      $container.animate({
+        scrollLeft: position
+      });
+    } else if (position > currentScrollPosition + containerWidth) {
+      $container.animate({
+        scrollLeft: Math.max(0, position - containerWidth)
+      });
+    }
+  },
+
+  currentCardIsInThisList: function() {
+    var currentCard = Cards.findOne(Session.get('currentCard'));
+    var listId = this.currentData()._id;
+    return currentCard && currentCard.listId === listId;
+  },
+
+  onRendered: function() {
+    var self = this;
+
+    self.scrollLeft();
+
+    var lists = this.find('.js-lists');
+
+    // We want to animate the card details window closing. We rely on CSS
+    // transition for the actual animation.
+    lists._uihooks = {
+      removeElement: function(node) {
+        var removeNode = _.once(function() {
+          node.parentNode.removeChild(node);
+        });
+        if ($(node).hasClass('js-card-detail')) {
+          $(node).css({
+            flex: '0 0 0',
+            padding: 0
+          });
+          $(lists).one(endTransitionEvents, removeNode);
+        } else {
+          removeNode();
+        }
+      }
+    };
+
+    if (! Meteor.userId() || ! Meteor.user().isBoardMember())
+      return;
+
+    self.$(lists).sortable({
+      tolerance: 'pointer',
+      appendTo: '.js-lists',
+      helper: 'clone',
+      items: '.js-list:not(.js-list-composer)',
+      placeholder: 'list placeholder',
+      start: function(event, ui) {
+        $('.list.placeholder').height(ui.item.height());
+        Popup.close();
+      },
+      stop: function() {
+        self.$('.js-lists').find('.js-list:not(.js-list-composer)').each(
+          function(i, list) {
+            var data = Blaze.getData(list);
+            Lists.update(data._id, {
+              $set: {
+                sort: i
+              }
+            });
+          }
+        );
+      }
+    });
+
+    // If there is no data in the board (ie, no lists) we autofocus the list
+    // creation form by clicking on the corresponding element.
+    if (self.data().lists().count() === 0) {
+      this.openNewListForm();
+    }
+  },
+
+  sidebarSize: function() {
+    var sidebar = this.componentChildren('sidebar')[0];
+    if (sidebar && sidebar.isOpen())
+      return 'next-sidebar';
+  }
+}).register('boardComponent');
+
+BlazeComponent.extendComponent({
+  template: function() {
+    return 'addListForm';
+  },
+
+  // Proxy
+  open: function() {
+    this.componentChildren('inlinedForm')[0].open();
+  },
+
+  events: function() {
+    return [{
+      submit: function(evt) {
+        evt.preventDefault();
+        var title = this.find('.list-name-input');
+        if ($.trim(title.value)) {
+          Lists.insert({
+            title: title.value,
+            boardId: Session.get('currentBoard'),
+            sort: $('.list').length
+          });
+
+          title.value = '';
+        }
+      }
+    }];
+  }
+}).register('addListForm');