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/exercises/exercise_host.gd

@@ -29,6 +29,8 @@ var _pending_outcome := ""
 @onready var _exercise_container: Control = %ExerciseContainer
 @onready var _overlay_container: Control = %OverlayContainer
 @onready var _progress_label: Label = %ProgressLabel
+@onready var _abandon_button: Button = %AbandonButton
+@onready var _abandon_confirm_dialog: ConfirmationDialog = %AbandonConfirmDialog
 
 
 ## Accesseurs reserves aux tests d'integration (scenes/exercises/
@@ -50,6 +52,14 @@ func get_outcomes() -> Array[String]:
 
 
 func _ready() -> void:
+    _abandon_button.text = UIText.get_text("exercise_host.abandon_button")
+    _abandon_button.pressed.connect(_on_abandon_pressed)
+    _abandon_confirm_dialog.title = UIText.get_text("exercise_host.abandon_confirm_title")
+    _abandon_confirm_dialog.dialog_text = UIText.get_text("exercise_host.abandon_confirm_message")
+    _abandon_confirm_dialog.ok_button_text = UIText.get_text("exercise_host.abandon_confirm_yes")
+    _abandon_confirm_dialog.cancel_button_text = UIText.get_text("exercise_host.abandon_confirm_no")
+    _abandon_confirm_dialog.confirmed.connect(_on_abandon_confirmed)
+
     _mission = ExerciseEngine.get_mission(GameManager.pending_mission_id)
     _rule = ExerciseEngine.get_rule(_mission["rule_id"])
     _skill_id = _rule.get("skill", "")
@@ -57,6 +67,20 @@ func _ready() -> void:
     _show_rule_panel()
 
 
+func _on_abandon_pressed() -> void:
+    _abandon_confirm_dialog.popup_centered()
+
+
+## Quitter une mission ne rapporte ni etoile ni objet et n'est jamais compte
+## comme un echec. Les tentatives deja faites restent enregistrees (ce sont de
+## vraies observations d'apprentissage) et sont sauvegardees avant de partir.
+func _on_abandon_confirmed() -> void:
+    ProgressManager.save_now()
+    GameManager.pending_mission_id = ""
+    GameManager.last_outcomes = []
+    GameManager.goto(GameManager.SCENE_WORLD_MAP)
+
+
 func _show_rule_panel() -> void:
     var rule_panel: Control = preload("res://scenes/ui/rule_panel.tscn").instantiate()
     _overlay_container.add_child(rule_panel)

scenes/exercises/exercise_host.tscn

@@ -11,27 +11,12 @@ grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("1")
 
-[node name="HeaderBar" type="MarginContainer" parent="."]
-layout_mode = 1
-anchor_right = 1.0
-offset_bottom = 40.0
-grow_horizontal = 2
-theme_override_constants/margin_left = 16
-theme_override_constants/margin_top = 8
-theme_override_constants/margin_right = 16
-theme_override_constants/margin_bottom = 8
-
-[node name="ProgressLabel" type="Label" parent="HeaderBar"]
-unique_name_in_owner = true
-layout_mode = 2
-horizontal_alignment = 2
-
 [node name="ExerciseContainer" type="Control" parent="."]
 unique_name_in_owner = true
 layout_mode = 1
 anchor_right = 1.0
 anchor_bottom = 1.0
-offset_top = 40.0
+offset_top = 48.0
 grow_horizontal = 2
 grow_vertical = 2
 
@@ -44,3 +29,32 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 mouse_filter = 2
+
+[node name="HeaderBar" type="MarginContainer" parent="."]
+layout_mode = 1
+anchor_right = 1.0
+offset_bottom = 48.0
+grow_horizontal = 2
+theme_override_constants/margin_left = 16
+theme_override_constants/margin_top = 8
+theme_override_constants/margin_right = 16
+theme_override_constants/margin_bottom = 8
+
+[node name="HBox" type="HBoxContainer" parent="HeaderBar"]
+layout_mode = 2
+
+[node name="AbandonButton" type="Button" parent="HeaderBar/HBox"]
+unique_name_in_owner = true
+layout_mode = 2
+
+[node name="Spacer" type="Control" parent="HeaderBar/HBox"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="ProgressLabel" type="Label" parent="HeaderBar/HBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 2
+
+[node name="AbandonConfirmDialog" type="ConfirmationDialog" parent="."]
+unique_name_in_owner = true