Phase 3: Improve review input format from comma-separated to line-separated

Change strengths, weaknesses, and suggestions input from comma-separated format to
more natural line-separated format. Updates both frontend labels/placeholders and
backend processing logic to split on newlines instead of commas.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: mattgodbolt

prompt_testing/templates/review.html

@@ -306,21 +306,21 @@ <h4>✏️ Your Review</h4>
                     </div>
 
                     <div class="form-group">
-                        <label>Strengths (comma-separated):</label>
+                        <label>Strengths (one per line):</label>
                         <textarea name="strengths" data-case="{{ result.case_id }}"
-                                  placeholder="What does this response do well?"></textarea>
+                                  placeholder="Clear technical explanations&#10;Good use of examples&#10;Appropriate for audience level"></textarea>
                     </div>
 
                     <div class="form-group">
-                        <label>Weaknesses (comma-separated):</label>
+                        <label>Weaknesses (one per line):</label>
                         <textarea name="weaknesses" data-case="{{ result.case_id }}"
-                                  placeholder="What could be improved?"></textarea>
+                                  placeholder="Missing key insights&#10;Too verbose for the audience&#10;Unclear instruction explanations"></textarea>
                     </div>
 
                     <div class="form-group">
-                        <label>Suggestions (comma-separated):</label>
+                        <label>Suggestions (one per line):</label>
                         <textarea name="suggestions" data-case="{{ result.case_id }}"
-                                  placeholder="Specific suggestions for improvement"></textarea>
+                                  placeholder="Add more WHY explanations&#10;Include performance implications&#10;Simplify technical terms"></textarea>
                     </div>
 
                     <div class="form-group">

prompt_testing/web_review.py

@@ -205,9 +205,9 @@ def save_review():
                     conciseness=int(review_data["conciseness"]),
                     insight=int(review_data["insight"]),
                     appropriateness=int(review_data["appropriateness"]),
-                    strengths=[s.strip() for s in review_data.get("strengths", "").split(",") if s.strip()],
-                    weaknesses=[w.strip() for w in review_data.get("weaknesses", "").split(",") if w.strip()],
-                    suggestions=[s.strip() for s in review_data.get("suggestions", "").split(",") if s.strip()],
+                    strengths=[s.strip() for s in review_data.get("strengths", "").split("\n") if s.strip()],
+                    weaknesses=[w.strip() for w in review_data.get("weaknesses", "").split("\n") if w.strip()],
+                    suggestions=[s.strip() for s in review_data.get("suggestions", "").split("\n") if s.strip()],
                     overall_comments=review_data.get("overall_comments", ""),
                     compared_to=review_data.get("compared_to"),
                     preference=review_data.get("preference"),