Use tags/links to show extended classes in Diviner, and fix a minor empty state thing

Summary: Ref T988. Show "Extends:" as linked tags. Fix the style of "This <top-level thing, like a class or function>" is not documented so it's the same as "This method is not documented.".

Test Plan:
Tags thing before:

{F57557}

Tags thing after:

{F57558}

Undoc before:

{F57559}

Undoc after:

{F57560}

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D6910

src/__celerity_resource_map__.php

@@ -1149,7 +1149,7 @@ celerity_register_resource_map(array(
   ),
   'diviner-shared-css' =>
   array(
-    'uri' => '/res/9c11bf88/rsrc/css/diviner/diviner-shared.css',
+    'uri' => '/res/686727d1/rsrc/css/diviner/diviner-shared.css',
     'type' => 'css',
     'requires' =>
     array(

src/applications/diviner/controller/DivinerAtomController.php

@@ -254,9 +254,16 @@ final class DivinerAtomController extends DivinerController {
 
     $lineage = $this->getExtendsLineage($symbol);
     if ($lineage) {
-      $lineage = mpull($lineage, 'getName');
-      $lineage = implode(' > ', $lineage);
-      $view->addProperty(pht('Extends'), $lineage);
+      $tags = array();
+      foreach ($lineage as $item) {
+        $tags[] = id(new PhabricatorTagView())
+          ->setType(PhabricatorTagView::TYPE_OBJECT)
+          ->setName($item->getName())
+          ->setHref($item->getURI());
+      }
+
+      $tags = phutil_implode_html(" \xE2\x96\xB6 ", $tags);
+      $view->addProperty(pht('Extends'), $tags);
     }
 
     $implements = $this->getImplementsLineage($symbol);
@@ -581,12 +588,12 @@ final class DivinerAtomController extends DivinerController {
         $content);
     } else {
       $atom = $symbol->getAtom();
-      $undoc = DivinerAtom::getThisAtomIsNotDocumentedString($atom->getType());
-      $content = id(new PHUIBoxView())
-        ->addPadding(PHUI::PADDING_LARGE_LEFT)
-        ->addPadding(PHUI::PADDING_LARGE_BOTTOM)
-        ->addPadding(PHUI::PADDING_LARGE_RIGHT)
-        ->appendChild(hsprintf('<em>%s</em>', $undoc));
+      $content = phutil_tag(
+        'div',
+        array(
+          'class' => 'diviner-message-not-documented',
+        ),
+        DivinerAtom::getThisAtomIsNotDocumentedString($atom->getType()));
     }
 
     return $content;

webroot/rsrc/css/diviner/diviner-shared.css

@@ -65,9 +65,10 @@
   padding: 0 8px 16px 0;
 }
 
-.diviner-document-section em {
+.diviner-message-not-documented {
   color: {$lightgreytext};
-  text-decoration: italic;
+  font-style: italic;
+  margin: 16px;
 }
 
 .diviner-method-implementation-header {