Audit complet de mise en forme — Titre/Paragraphe (1er élément du tableau)

Nouveau module partagé document_engine/rendering/box_style.py
(padding/margin/background_color/border_radius/border par côté/height/
min-height/max-height/min-width/box-shadow/opacity/align_self) —
réutilisable tel quel par tous les kinds suivants du tableau d'audit.

Titre/Paragraphe gagnent : barré, police de caractère, taille de
police, hauteur de ligne, espacement des lettres, majuscules/
minuscules/capitales, ombre du texte, et tous les attributs de boîte
partagés ci-dessus. Interface entièrement à base de curseurs/cases à
cocher/listes déroulantes/sélecteurs de couleur natifs — plus aucun
champ de texte libre pour une valeur CSS (retour utilisateur).

Deux bugs transversaux corrigés au passage (concernent tout
l'éditeur) :
- Le panneau Propriétés n'était jamais reconstruit après un clic sur un
  bouton (gras/alignement/segments...) — il fallait recharger la page
  pour voir l'état réel. Corrigé dans forgeDocUpdateAttributes, point
  d'entrée unique de toute mise à jour d'attribut.
- Les cases à cocher et curseurs héritaient à tort le style d'un champ
  de texte (padding/bordure/fond/largeur 100%) via la règle générique
  .docField input.

Ajoute docs/plan/AUDIT_MISE_EN_FORME.md : suivi de l'audit élément par
élément (Titre/Paragraphe traité, Image ensuite).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/document/test_document_elements.py

@@ -12,6 +12,7 @@ from typing import Any
 
 import db
 import document_engine as doc_engine
+from document_engine.rendering.box_style import default_border as doc_engine_box_default_border
 
 
 def _new_support(tmp_support_slug_cleanup: Any, name: str = "Support de test") -> tuple[str, int]:
@@ -32,6 +33,129 @@ def test_add_and_get_document_element_uses_default_attributes(tmp_support_slug_c
     assert element["attributes"]["content"] == "Nouveau titre"
 
 
+def test_titre_default_attributes_include_all_new_formatting_fields(tmp_support_slug_cleanup: Any) -> None:
+    """Audit du 26/09/2026 (réglages manquants) — chaque nouveau champ
+    doit exister avec une valeur "neutre" par défaut (comportement
+    historique inchangé, voir _render_text)."""
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    element = doc_engine.get_document_element(slug, element_id)
+    assert element is not None
+    attrs = element["attributes"]
+    assert attrs["strikethrough"] is False
+    assert attrs["font_family"] == ""
+    assert attrs["font_size"] == ""
+    assert attrs["line_height"] == ""
+    assert attrs["letter_spacing"] == ""
+    assert attrs["text_transform"] == "none"
+    assert attrs["text_shadow"] == ""
+    assert attrs["padding"] == ""
+    assert attrs["margin"] == ""
+    assert attrs["background_color"] == ""
+    assert attrs["border_radius"] == ""
+    assert attrs["align_self"] == "stretch"
+    assert attrs["height"] == ""
+    assert attrs["min_height"] == ""
+    assert attrs["max_height"] == ""
+    assert attrs["min_width"] == ""
+    assert attrs["box_shadow"] == ""
+    assert attrs["opacity"] == ""
+    assert attrs["border"] == doc_engine_box_default_border()
+
+    html = doc_engine.render_document([element])
+    assert html == (
+        f'<div class="docText" data-element-id="{element_id}" data-kind="titre" '
+        f'style="font-size:clamp(1.6rem,4vw,2rem); font-weight:800; line-height:1.15; '
+        f'font-style:normal; text-decoration:none; text-align:left; color:var(--forge-text);">'
+        f"Nouveau titre</div>"
+    )
+
+
+def test_titre_strikethrough_combines_with_underline(tmp_support_slug_cleanup: Any) -> None:
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    doc_engine.update_document_element_attributes(
+        slug, element_id, {"content": "X", "underline": True, "strikethrough": True}
+    )
+    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "text-decoration:underline line-through;" in html
+
+
+def test_titre_font_size_and_line_height_override_the_style_preset(tmp_support_slug_cleanup: Any) -> None:
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    doc_engine.update_document_element_attributes(
+        slug, element_id, {"content": "X", "style": "titre1", "font_size": "40px", "line_height": "1"}
+    )
+    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "font-size:40px;" in html
+    assert "line-height:1;" in html
+    assert "clamp(1.6rem" not in html
+
+
+def test_titre_font_family_letter_spacing_and_text_shadow_render_when_set(tmp_support_slug_cleanup: Any) -> None:
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    doc_engine.update_document_element_attributes(
+        slug,
+        element_id,
+        {
+            "content": "X",
+            "font_family": "Georgia, serif",
+            "letter_spacing": "0.05em",
+            "text_shadow": "1px 1px 2px rgba(0,0,0,.3)",
+        },
+    )
+    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "font-family:Georgia, serif;" in html
+    assert "letter-spacing:0.05em;" in html
+    assert "text-shadow:1px 1px 2px rgba(0,0,0,.3);" in html
+
+
+def test_titre_text_transform_uppercase_renders_and_none_does_not(tmp_support_slug_cleanup: Any) -> None:
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    html_default = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "text-transform" not in html_default
+
+    doc_engine.update_document_element_attributes(slug, element_id, {"content": "X", "text_transform": "uppercase"})
+    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "text-transform:uppercase;" in html
+
+
+def test_titre_box_style_attributes_render_via_shared_box_style(tmp_support_slug_cleanup: Any) -> None:
+    slug, page_id = _new_support(tmp_support_slug_cleanup)
+    element_id = doc_engine.add_document_element(slug, "titre", page_id=page_id)
+    border = doc_engine_box_default_border()
+    border["bottom"] = {"style": "dashed", "width": "3px", "color": "#123456"}
+    doc_engine.update_document_element_attributes(
+        slug,
+        element_id,
+        {
+            "content": "X",
+            "padding": "10px",
+            "margin": "5px",
+            "background_color": "#fafafa",
+            "border_radius": "4px",
+            "align_self": "center",
+            "border": border,
+            "height": "300px",
+            "box_shadow": "0 4px 12px rgba(0,0,0,.2)",
+            "opacity": "0.9",
+        },
+    )
+    html = doc_engine.render_document(doc_engine.list_document_elements(slug, page_id))
+    assert "padding:10px;" in html
+    assert "margin:5px;" in html
+    assert "background-color:#fafafa;" in html
+    assert "border-radius:4px;" in html
+    assert "align-self:center;" in html
+    assert "border-bottom:3px dashed #123456;" in html
+    assert "height:300px;" in html
+    assert "box-shadow:0 4px 12px rgba(0,0,0,.2);" in html
+    assert "opacity:0.9;" in html
+
+
 def test_get_document_element_returns_none_for_missing_id(tmp_support_slug_cleanup: Any) -> None:
     slug, _page_id = _new_support(tmp_support_slug_cleanup)
     assert doc_engine.get_document_element(slug, 999) is None