feat(lea): bulles 'Léa exécute' stylisées + templates par event

J3.4 — distinction visuelle entre :
- Bulles chat normales (fond bleu clair, prefixe 💬, taille standard)
- Bulles d'action Léa (fond gris clair, encadré subtil, icône sémantique
  en couleur, libellé court, métadonnées discrètes en pied)
- Bulle paused supervisée (jaune, boutons interactifs — déjà en J3.5)

Templates de libellés volontairement neutres : le contexte métier (UHCD,
peakflow, J12.1, IPP 25003284…) provient des payloads émis par le pipeline
côté serveur, pas de hardcoding dans le client.

Mappage events → bulles :
  lea:action_started   ▶ bleu  "Démarrage : {workflow}"
  lea:action_progress  ⋯ bleu  "{step}" ou "Étape {current}/{total}"
  lea:done             ✓ vert / ✗ rouge selon success
  lea:need_confirm     ?  bleu  "{action.description}"
  lea:step_result      ✓ / ✗ / · selon status
  lea:resumed          → vert  "Reprise"
  lea:resume_acked     (silencieux côté UI)
  lea:abort_acked      (silencieux côté UI)
  événement inconnu    · gris  fallback neutre

18 nouveaux tests pytest (templates + extract_meta).
Total branche : 47/47 verts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/integration/test_chat_window_templates.py

@@ -0,0 +1,129 @@
+"""Tests des templates de bulles 'Léa exécute' (J3.4).
+
+On teste les fonctions _tpl_* et _extract_meta de chat_window.py — elles sont
+purement fonctionnelles (input payload → output tuple), aucune UI tkinter
+nécessaire.
+"""
+
+import pytest
+
+from agent_v0.agent_v1.ui import chat_window as cw
+
+
+# ----------------------------------------------------------------------
+# Templates _tpl_*
+# ----------------------------------------------------------------------
+
+def test_tpl_action_started_uses_workflow_name():
+    icon, color, title = cw._tpl_action_started({"workflow": "Demo Urgences UHCD"})
+    assert icon == "▶"
+    assert color == cw.ACTION_ICON_RUN
+    assert "Demo Urgences UHCD" in title
+
+
+def test_tpl_action_started_fallback_when_no_workflow():
+    _, _, title = cw._tpl_action_started({})
+    assert "?" in title
+
+
+def test_tpl_action_progress_uses_step_when_provided():
+    _, _, title = cw._tpl_action_progress({"step": "J'ouvre la fiche patient"})
+    assert title == "J'ouvre la fiche patient"
+
+
+def test_tpl_action_progress_fallback_to_counter():
+    _, _, title = cw._tpl_action_progress({"current": 4, "total": 7})
+    assert "4/7" in title
+
+
+def test_tpl_done_success():
+    icon, color, title = cw._tpl_done({"success": True, "message": "Codage terminé"})
+    assert icon == "✓"
+    assert color == cw.ACTION_ICON_OK
+    assert title == "Codage terminé"
+
+
+def test_tpl_done_failure():
+    icon, color, title = cw._tpl_done({"success": False, "message": "Action échouée"})
+    assert icon == "✗"
+    assert color == cw.ACTION_ICON_ERR
+    assert title == "Action échouée"
+
+
+def test_tpl_done_default_success_when_unspecified():
+    icon, _, _ = cw._tpl_done({})
+    assert icon == "✓"  # par défaut on suppose succès si non précisé
+
+
+def test_tpl_need_confirm_extracts_action_description():
+    icon, _, title = cw._tpl_need_confirm({
+        "action": {"description": "Cliquer sur l'IPP 25003284"}
+    })
+    assert icon == "?"
+    assert "25003284" in title
+
+
+def test_tpl_need_confirm_fallback():
+    _, _, title = cw._tpl_need_confirm({})
+    assert "Validation" in title
+
+
+def test_tpl_step_result_ok():
+    icon, color, _ = cw._tpl_step_result({"status": "ok", "message": "ok"})
+    assert icon == "✓"
+    assert color == cw.ACTION_ICON_OK
+
+
+def test_tpl_step_result_failed():
+    icon, color, _ = cw._tpl_step_result({"status": "failed", "message": "boom"})
+    assert icon == "✗"
+    assert color == cw.ACTION_ICON_ERR
+
+
+def test_tpl_step_result_neutral_status():
+    icon, color, _ = cw._tpl_step_result({"status": "skipped", "message": "passé"})
+    assert icon == "·"
+    assert color == cw.ACTION_ICON_INFO
+
+
+def test_tpl_resumed():
+    icon, color, title = cw._tpl_resumed({})
+    assert icon == "→"
+    assert color == cw.ACTION_ICON_OK
+    assert "Reprise" in title
+
+
+# ----------------------------------------------------------------------
+# Dispatch — chaque event lea:* (hors paused/acks) doit avoir un template
+# ----------------------------------------------------------------------
+
+def test_all_relevant_events_have_a_template():
+    expected = {
+        "lea:action_started", "lea:action_progress", "lea:done",
+        "lea:need_confirm", "lea:step_result", "lea:resumed",
+    }
+    assert set(cw._ACTION_TEMPLATES.keys()) == expected
+
+
+# ----------------------------------------------------------------------
+# _extract_meta
+# ----------------------------------------------------------------------
+
+def test_extract_meta_with_workflow():
+    meta = cw._extract_meta({"workflow": "Demo Urgences"})
+    assert meta == "Demo Urgences"
+
+
+def test_extract_meta_with_progress():
+    meta = cw._extract_meta({"workflow": "Demo Urgences", "current": 4, "total": 7})
+    assert "Demo Urgences" in meta
+    assert "étape 4/7" in meta
+
+
+def test_extract_meta_with_replay_id_truncated():
+    meta = cw._extract_meta({"replay_id": "rep_abcdef0123456789"})
+    assert "#789" in meta or "456789" in meta  # 6 derniers caractères
+
+
+def test_extract_meta_empty_payload():
+    assert cw._extract_meta({}) == ""