fix: expose chunk via hidden textbox so source passage displays in feedback

app.py

@@ -155,7 +155,8 @@ body { background: #0A0F1E !important; margin: 0 !important; }
 #hidden-submit-btn,
 #hidden-question-btn,
 #hidden-question-trigger,
-#hidden-answer-trigger {
+#hidden-answer-trigger,
+#hidden-chunk-output {
     position: fixed !important;
     top: -9999px !important;
     left: -9999px !important;
@@ -276,17 +277,17 @@ def new_question(chunks, language):
     s = UI[language]
     if not chunks:
         print("[new_question] no chunks, returning early")
-        return s["no_pdf"], "", s["no_pdf"]
+        return s["no_pdf"], "", s["no_pdf"], ""
     try:
         chunk = random.choice(chunks)
         print(f"[new_question] chunk selected ({len(chunk)} chars), calling LLM…")
         question = generate_question(chunk, language=language)
         print(f"[new_question] question generated: {question[:80]!r}")
-        return question, chunk, ""
+        return question, chunk, "", chunk
     except Exception as e:
         import traceback; traceback.print_exc()
         err = f"Erreur : {e}"
-        return err, "", err
+        return err, "", err, ""
 
 
 @spaces.GPU(duration=120)
@@ -415,6 +416,9 @@ BRIDGE_JS = """() => {
         ? sections.map(s => '<div class="section"><span class="section-num">'+(labels[s.num]||'Part '+s.num)+'</span><div class="section-content">'+s.body.replace(/\\n/g,'<br>')+'</div></div>').join('')
         : '<div class="feedback-raw">'+text.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;')+'</div>';
     }
+    const chunkEl = document.querySelector('#hidden-chunk-output textarea');
+    const srcEl = document.getElementById('source-text');
+    if (srcEl && chunkEl) srcEl.textContent = chunkEl.value;
     if (fc) { fc.classList.remove('hidden'); fc.classList.add('fade-in-up'); setTimeout(() => fc.scrollIntoView({behavior:'smooth',block:'nearest'}),100); }
     return verdict;
   }
@@ -616,6 +620,7 @@ with gr.Blocks(title="PaperProf", css=CSS) as demo:
     feedback_box     = gr.Textbox(label="💬 Feedback", interactive=False, lines=7, elem_id="hidden-feedback-output")
     question_trigger = gr.Textbox(value="0", label="qtrig", elem_id="hidden-question-trigger")
     answer_trigger   = gr.Textbox(value="0", label="atrig", elem_id="hidden-answer-trigger")
+    chunk_display    = gr.Textbox(value="",  label="chunk", elem_id="hidden-chunk-output")
 
     # Traduction UI quand on change la langue
     language_selector.change(
@@ -633,7 +638,7 @@ with gr.Blocks(title="PaperProf", css=CSS) as demo:
     question_trigger.change(
         new_question,
         inputs=[chunks_state, language_selector],
-        outputs=[question_box, chunk_state, feedback_box],
+        outputs=[question_box, chunk_state, feedback_box, chunk_display],
     )
 
     answer_trigger.change(