Make headline images explicit, add asset credits

- related_assets gains a `headline` boolean (DB-enforced: at most one
  per page), replacing "first image by position" as the headline
  rule. A rake task backfills the current first image on every live
  head/draft, so nothing changes visually until an editor changes it.
- The image picker sidebar gets a star toggle reflecting the flag;
  the TinyMCE inline-image picker's badge now reads it too, instead
  of assuming position 0.
- No headline chosen (or none attached) now falls back to the
  gallery-count caption itself becoming the lightbox trigger, instead
  of the gallery being unreachable.
- Assets gain creator, source_url, and license_key (against a new
  config/asset_licenses.yml dictionary). asset_credit renders a
  degrading attribution line, reused as a hidden per-image glightbox
  caption so credit is one click away for every image, not only the
  headline's always-visible one.
- Fixed: asset thumbnails rendered unconditionally regardless of
  whether a real variant exists on disk. Asset#has_variant? checks
  file existence, not content type -- some legacy PDFs have real
  pre-rewrite thumbnails a content-type check would have hidden.
- assets#new/edit rebuilt onto the same node_description/node_content
  layout as assets#show, picking up the three new fields in the
  process.

1 files changed, 46 insertions, 0 deletions

diff --git a/test/controllers/related_assets_controller_test.rb b/test/controllers/related_assets_controller_test.rb
index 9d20cbb..2384adc 100644
--- a/test/controllers/related_assets_controller_test.rb
+++ b/test/controllers/related_assets_controller_test.rb
@@ -88,4 +88,50 @@ class RelatedAssetsControllerTest < ActionController::TestCase
     ordered_asset_ids = node.draft.reload.related_assets.map(&:asset_id)
     assert_equal [second.id, first.id], ordered_asset_ids
   end
+
+  test "update sets the headline flag" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "related_assets_headline_test")
+    asset = Asset.create!(:name => "headline-photo", :upload_content_type => "image/png")
+    node.draft.assets << asset
+    related = node.draft.related_assets.find_by(:asset_id => asset.id)
+
+    patch :update, params: { :node_id => node.id, :id => related.id, :headline => "true" }
+
+    assert_response :success
+    assert related.reload.headline?
+  end
+
+  test "update with headline=true clears any previous headline on the same page" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "related_assets_headline_swap_test")
+    first  = Asset.create!(:name => "first-headline", :upload_content_type => "image/png")
+    second = Asset.create!(:name => "second-headline", :upload_content_type => "image/png")
+    node.draft.assets << first
+    node.draft.assets << second
+
+    first_related  = node.draft.related_assets.find_by(:asset_id => first.id)
+    second_related = node.draft.related_assets.find_by(:asset_id => second.id)
+    first_related.update!(:headline => true)
+
+    patch :update, params: { :node_id => node.id, :id => second_related.id, :headline => "true" }
+
+    assert_response :success
+    assert_not first_related.reload.headline?
+    assert second_related.reload.headline?
+  end
+
+  test "update with headline=false clears the headline" do
+    login_as :quentin
+    node = Node.root.children.create!(:slug => "related_assets_headline_unset_test")
+    asset = Asset.create!(:name => "unset-headline", :upload_content_type => "image/png")
+    node.draft.assets << asset
+    related = node.draft.related_assets.find_by(:asset_id => asset.id)
+    related.update!(:headline => true)
+
+    patch :update, params: { :node_id => node.id, :id => related.id, :headline => "false" }
+
+    assert_response :success
+    assert_not related.reload.headline?
+  end
 end