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, 25 insertions, 0 deletions

diff --git a/config/asset_licenses.yml b/config/asset_licenses.yml
new file mode 100644
index 00000000..5cf377fe
--- /dev/null
+++ b/config/asset_licenses.yml
@@ -0,0 +1,25 @@
+# config/asset_licenses.yml
+cc0:
+  url: "https://creativecommons.org/publicdomain/zero/1.0/"
+  requires_attribution: false
+  style: license
+cc_by_4:
+  url: "https://creativecommons.org/licenses/by/4.0/"
+  requires_attribution: true
+  style: license
+cc_by_sa_4:
+  url: "https://creativecommons.org/licenses/by-sa/4.0/"
+  requires_attribution: true
+  style: license
+public_domain:
+  url:
+  requires_attribution: false
+  style: note
+used_with_permission:
+  url:
+  requires_attribution: false
+  style: note
+own_work:
+  url:
+  requires_attribution: false
+  style: note