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.

managers/level_manager.gd

@@ -0,0 +1,51 @@
+## LevelManager.gd
+# Manages the current level's data, visual representation, and navigation graph.
+# Responsible for generating, painting, and initializing the level, as well as providing pathfinding and coordinate helpers.
+extends Node
+
+# The source of truth for the current level's layout (MapData resource).
+var _data: MapData
+# The TileMapLayer node where the map is visually rendered.
+var _layer: TileMapLayer
+
+# Service objects for map generation, painting, and pathfinding.
+# MapGenerator and MapPainter are stateless; PathfindingHandler manages the navigation graph.
+var _generator: MapGenerator = MapGenerator.new()
+var _painter: MapPainter = MapPainter.new()
+var _pathfinding: PathfindingHandler = PathfindingHandler.new()
+
+# Orchestrates the creation of a new level.
+# 1. Generates the map data.
+# 2. Paints the map visually.
+# 3. Builds the navigation graph for AI/pathfinding.
+# 4. Spawns the player at the correct location.
+func initialize(settings: MapSettings, layer: TileMapLayer, player: CharacterBody2D) -> void:
+	_layer = layer
+
+	# 1. Generate the abstract map data (rooms, corridors, etc.).
+	# This avoids side effects on the settings resource.
+	_data = _generator.generate(settings)
+
+	# 2. Paint the visual layer for the player to see.
+	# This does not modify the underlying map data.
+	_painter.paint(_data, _layer)
+
+	# 3. Build the AStar graph for AI and navigation.
+	# Reads directly from the grid stored in _data.
+	_pathfinding.build(_data)
+
+	# 4. Finalize world state by spawning the player at the spawn point.
+	# Uses the TileMapLayer to convert grid coordinates to world pixel positions.
+	player.position = _layer.map_to_local(_data.spawn_point)
+
+# Public API for other systems (like AI) to query the navigation grid.
+# Encapsulates the PathfindingHandler so callers don't need to know about it directly.
+func find_path(from: Vector2i, to: Vector2i) -> Array[Vector2i]:
+	return _pathfinding.find_path(from, to)
+
+# Coordinate conversion helpers — lets the player and other systems convert between world and tile coordinates without touching the TileMapLayer directly.
+func world_to_tile(world_pos: Vector2) -> Vector2i:
+	return _layer.local_to_map(world_pos)
+
+func tile_to_world(tile: Vector2i) -> Vector2:
+	return _layer.map_to_local(tile)