fix(gui): clarifier aide et disponibilite moteurs

Passe theme clair, libelles utilisateur, aides conteneurs, recherche de mise a jour et indication honnete des moteurs optionnels non embarques. Tests GUI unitaires: 126 passed.

gui_v6/ui_kit.py

@@ -22,7 +22,15 @@ def font(size: int = 13, weight: str = "normal") -> "ctk.CTkFont":
 class Card(ctk.CTkFrame):
     """Carte maquette : fond `card`, bordure `card_border`, titre uppercase optionnel."""
 
-    def __init__(self, master, palette: dict, title: Optional[str] = None, **kwargs):
+    def __init__(
+        self,
+        master,
+        palette: dict,
+        title: Optional[str] = None,
+        help_text: Optional[str] = None,
+        help_title: Optional[str] = None,
+        **kwargs,
+    ):
         super().__init__(
             master,
             fg_color=palette["card"],
@@ -34,13 +42,22 @@ class Card(ctk.CTkFrame):
         self._palette = palette
         self.body = self  # alias pour clarté
         if title:
+            header = ctk.CTkFrame(self, fg_color="transparent")
+            header.pack(fill="x", padx=16, pady=(14, 8))
             ctk.CTkLabel(
-                self,
+                header,
                 text=title.upper(),
                 text_color=palette["text_dim"],
                 font=font(11, "bold"),
                 anchor="w",
-            ).pack(anchor="w", padx=16, pady=(14, 8))
+            ).pack(side="left", fill="x", expand=True)
+            if help_text:
+                HelpButton(
+                    header,
+                    palette,
+                    help_text,
+                    title=help_title or title.lstrip("⚙️👤🏷️⬛🧠📝🛡️🔍✅📤📥 ").strip() or "Aide",
+                ).pack(side="right", padx=(8, 0))
 
 
 def primary_button(master, palette: dict, text: str, command=None, large: bool = False):