Add way back to profile selection and abandoning a mission

World map gets a "Changer de profil" button (saves first). During a
mission, a header button asks for confirmation then leaves without
stars or items; attempts already made stay recorded and are saved.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scenes/world/world_map.gd

@@ -16,6 +16,7 @@ var _viewed_level := "CE1"
 @onready var _level_toggle_button: Button = %LevelToggleButton
 @onready var _total_stars_label: Label = %TotalStarsLabel
 @onready var _collection_button: Button = %CollectionButton
+@onready var _profile_button: Button = %ProfileButton
 
 
 func _ready() -> void:
@@ -24,6 +25,8 @@ func _ready() -> void:
     _level_toggle_button.pressed.connect(_on_level_toggle_pressed)
     _collection_button.text = UIText.get_text("world_map.collection_button")
     _collection_button.pressed.connect(_on_collection_pressed)
+    _profile_button.text = UIText.get_text("world_map.change_profile_button")
+    _profile_button.pressed.connect(_on_change_profile_pressed)
     _refresh()
 
 
@@ -49,6 +52,13 @@ func _populate_missions() -> void:
         _map_area.add_child(_build_marker(mission))
 
 
+## Revient au choix du profil sans rien perdre : la progression est ecrite
+## avant de quitter la carte (le profil se rechargera a la prochaine selection).
+func _on_change_profile_pressed() -> void:
+    ProgressManager.save_now()
+    GameManager.goto(GameManager.SCENE_PROFILE_SELECT)
+
+
 func _on_collection_pressed() -> void:
     GameManager.goto(GameManager.SCENE_COLLECTION)