Truncate long title in social image card (forem#21371)

app/models/article.rb

@@ -1060,7 +1060,7 @@ def set_nth_published_at
   end
 
   def title_to_slug
-    truncated_title = title[0..100].split[0...-1].join(" ")
+    truncated_title = title.size > 100 ? title[0..100].split[0...-1].join(" ") : title
     "#{Sterile.sluggerize(truncated_title)}-#{rand(100_000).to_s(26)}"
   end
 

app/services/images/generate_social_image_magickally.rb

@@ -91,6 +91,7 @@ def add_logo(result)
     end
 
     def add_text(result, title, date, author_name)
+      title = title.truncate(128)
       title = wrap_text(title)
       font_size = calculate_font_size(title)
 

spec/services/images/generate_social_image_magickally_spec.rb

@@ -173,6 +173,14 @@
         generator.send(:add_text, result_image, "title", "date", "author_name")
         expect(result_image).to have_received(:combine_options).exactly(3).times
       end
+
+      it "truncates text longer than 128" do
+        allow(generator).to receive(:wrap_text).and_return("whatever")
+        text = "This is a very long text that is definitely more than 128 characters long and should be wrapped over multiple lines. This is a very long text that is definitely more than 128 characters long and should be wrapped over multiple lines."
+        truncated_text = "This is a very long text that is definitely more than 128 characters long and should be wrapped over multiple lines. This is ..."
+        generator.send(:add_text, result_image, text, "date", "author_name")
+        expect(generator).to have_received(:wrap_text).with(truncated_text)
+      end
     end
 
     context "add_profile_image" do