UX: Avoid introductory phrases and summarize topics without replies (#848)

lib/summarization/fold_content.rb

@@ -45,16 +45,19 @@ module DiscourseAi
             summarize_chunks(initial_chunks, user, opts, &on_partial_blk)
           end
 
+        clean_summary =
+          Nokogiri::HTML5.fragment(result[:summary]).css("ai")&.first&.text || result[:summary]
+
         if persist_summaries
           AiSummary.store!(
             strategy.target,
             strategy.type,
             llm_model.name,
-            result[:summary],
+            clean_summary,
             content_to_summarize[:contents].map { |c| c[:id] },
           )
         else
-          AiSummary.new(summarized_text: result[:summary])
+          AiSummary.new(summarized_text: clean_summary)
         end
       end
 

lib/summarization/strategies/hot_topic_gists.rb

@@ -95,22 +95,34 @@ module DiscourseAi
             - Use the original language of the text.
             - Begin directly with the main topic or issue, avoiding introductory phrases.
             - Limit the summary to a maximum of 20 words.
+
+            Return the 20-word summary inside <ai></ai> tags.
           TEXT
 
-          prompt.push(type: :user, content: <<~TEXT.strip)
+          context = +<<~TEXT
             ### Context:
             
-            The conversation began with the following statement:
-
             #{opts[:content_title].present? ? "The discussion title is: " + opts[:content_title] + ".\n" : ""}
             
-            #{statements&.pop}
+            The conversation began with the following statement:
         
+            #{statements&.pop}\n
+          TEXT
+
+          if statements.present?
+            context << <<~TEXT
               Subsequent discussion includes the following:
 
-            #{statements&.join}
+              #{statements&.join("\n")}
                   
-            Your task is to focus on these latest messages, capturing their meaning in the context of the initial post.
+              Your task is to focus on these latest messages, capturing their meaning in the context of the initial statement.
+            TEXT
+          else
+            context << "Your task is to capture the meaning of the initial statement."
+          end
+
+          prompt.push(type: :user, content: <<~TEXT.strip)
+            #{context} Return the 20-word summary inside <ai></ai> tags.
           TEXT
 
           prompt