Add post-move action menu flow

scripts/core/battle_state.gd

@@ -639,7 +639,7 @@ func clear_selection() -> void:
 	_notify_changed()
 
 
-func try_move_selected(cell: Vector2i) -> bool:
+func try_move_selected(cell: Vector2i, defer_reach_events := false) -> bool:
 	var unit := get_selected_unit()
 	if unit.is_empty() or battle_status != STATUS_ACTIVE:
 		return false
@@ -660,9 +660,40 @@ func try_move_selected(cell: Vector2i) -> bool:
 	unit["moved"] = true
 	unit_motion_requested.emit(str(unit.get("id", "")), from_cell, cell)
 	_emit_log("%s moved to %s." % [unit["name"], _format_cell(cell)])
+	if not defer_reach_events:
+		_run_events("unit_reaches_tile", str(unit.get("team", "")), turn_number, unit)
+		_check_battle_status()
+	_notify_changed()
+	return true
+
+
+func commit_pending_move_events(unit_id: String) -> bool:
+	var unit := get_unit(unit_id)
+	if unit.is_empty() or battle_status != STATUS_ACTIVE:
+		return false
 	_run_events("unit_reaches_tile", str(unit.get("team", "")), turn_number, unit)
 	_check_battle_status()
 	_notify_changed()
+	return battle_status == STATUS_ACTIVE
+
+
+func cancel_pending_move(unit_id: String, from_cell: Vector2i, to_cell: Vector2i) -> bool:
+	var unit := get_unit(unit_id)
+	if unit.is_empty() or battle_status != STATUS_ACTIVE:
+		return false
+	if bool(unit.get("acted", false)) or not bool(unit.get("moved", false)):
+		return false
+	if unit.get("pos", Vector2i(-1, -1)) != to_cell:
+		return false
+	var blocker := get_unit_at(from_cell)
+	if not blocker.is_empty() and str(blocker.get("id", "")) != unit_id:
+		return false
+
+	unit["pos"] = from_cell
+	unit["moved"] = false
+	unit_motion_requested.emit(unit_id, to_cell, from_cell)
+	_emit_log("%s cancels movement." % unit["name"])
+	_notify_changed()
 	return true