feat: Add core map generation and management system

- Introduced MapData, MapGenerator, and MapPainter classes for procedural map generation.
- Implemented LevelManager to handle level initialization and navigation.
- Created TurnManager for managing turn order in a turn-based system.
- Added Player and Enemy character classes with movement and turn-taking capabilities.
- Established pathfinding using AStar2D in PathfindingHandler.
- Integrated new scenes for player and enemy characters, along with world setup.
- Included a new tileset for futuristic Zelda-themed assets.

map/pathfinding_handler.gd

@@ -0,0 +1,48 @@
+## PathfindingHandler.gd
+# Handles A* pathfinding for the map using Godot's AStar2D.
+# Builds a navigation graph from walkable tiles and provides path queries.
+class_name PathfindingHandler
+extends RefCounted
+
+# All 8 possible neighbor offsets (cardinal and diagonal directions).
+const NEIGHBORS: Array[Vector2i] = [
+	Vector2i.RIGHT, Vector2i.LEFT, Vector2i.DOWN, Vector2i.UP,
+	Vector2i(1, 1), Vector2i(1, -1), Vector2i(-1, 1), Vector2i(-1, -1),
+]
+
+# The underlying AStar2D instance for pathfinding.
+var _astar: AStar2D = AStar2D.new()
+# Maps grid coordinates (Vector2i) to AStar2D point IDs.
+var _coord_to_id: Dictionary = {}
+
+# Builds the AStar2D graph from all walkable tiles in MapData.
+# Safe to call again for a new level — clears all previous state first.
+func build(data: MapData) -> void:
+	_astar.clear()
+	_coord_to_id.clear()
+
+	# Register a point for every walkable tile (FLOOR).
+	for coords: Vector2i in data.grid.keys():
+		if data.grid[coords] == MapData.TileType.FLOOR:
+			var id: int = _astar.get_available_point_id()
+			_astar.add_point(id, Vector2(coords.x, coords.y))
+			_coord_to_id[coords] = id
+
+	# Connect each point to its walkable neighbors (cardinal and diagonal).
+	for coords: Vector2i in _coord_to_id.keys():
+		for offset: Vector2i in NEIGHBORS:
+			var neighbor: Vector2i = coords + offset
+			if _coord_to_id.has(neighbor):
+				_astar.connect_points(_coord_to_id[coords], _coord_to_id[neighbor], false)
+
+# Returns the path as grid coordinates, or an empty array if no path exists.
+# Used by LevelManager and Player for navigation.
+func find_path(from: Vector2i, to: Vector2i) -> Array[Vector2i]:
+	if not _coord_to_id.has(from) or not _coord_to_id.has(to):
+		return []
+
+	var raw: PackedVector2Array = _astar.get_point_path(_coord_to_id[from], _coord_to_id[to])
+	var result: Array[Vector2i] = []
+	for point in raw:
+		result.append(Vector2i(point))
+	return result