refactor: restructure game logic and state management into separate modules

- Moved game logic from `game.rs` to `game/mod.rs` and `game/state.rs` for better organization.
- Updated `App` to utilize the new `Game` struct and its state management.
- Refactored error handling
- Removed unused audio subsystem references

tests/animated.rs

@@ -1,5 +1,6 @@
 use glam::U16Vec2;
-use pacman::texture::animated::{AnimatedTexture, AnimatedTextureError};
+use pacman::error::{AnimatedTextureError, GameError, TextureError};
+use pacman::texture::animated::AnimatedTexture;
 use pacman::texture::sprite::AtlasTile;
 use sdl2::pixels::Color;
 
@@ -17,12 +18,12 @@ fn test_animated_texture_creation_errors() {
 
     assert!(matches!(
         AnimatedTexture::new(tiles.clone(), 0.0).unwrap_err(),
-        AnimatedTextureError::InvalidFrameDuration(0.0)
+        GameError::Texture(TextureError::Animated(AnimatedTextureError::InvalidFrameDuration(0.0)))
     ));
 
     assert!(matches!(
         AnimatedTexture::new(tiles, -0.1).unwrap_err(),
-        AnimatedTextureError::InvalidFrameDuration(-0.1)
+        GameError::Texture(TextureError::Animated(AnimatedTextureError::InvalidFrameDuration(-0.1)))
     ));
 }
 

tests/game.rs

@@ -10,15 +10,4 @@ fn test_game_map_creation() {
 
     assert!(map.graph.node_count() > 0);
     assert!(!map.grid_to_node.is_empty());
-
-    // Should find Pac-Man's starting position
-    let pacman_pos = map.find_starting_position(0);
-    assert!(pacman_pos.is_some());
-}
-
-#[test]
-fn test_game_score_initialization() {
-    // This would require creating a full Game instance, but we can test the concept
-    let map = Map::new(RAW_BOARD).unwrap();
-    assert!(map.find_starting_position(0).is_some());
 }

tests/map_builder.rs

@@ -1,5 +1,5 @@
 use glam::Vec2;
-use pacman::constants::{BOARD_CELL_SIZE, CELL_SIZE, RAW_BOARD};
+use pacman::constants::{CELL_SIZE, RAW_BOARD};
 use pacman::map::Map;
 use sdl2::render::Texture;
 
@@ -21,19 +21,6 @@ fn test_map_creation() {
     assert!(has_connections);
 }
 
-#[test]
-fn test_map_starting_positions() {
-    let map = Map::new(RAW_BOARD).unwrap();
-
-    let pacman_pos = map.find_starting_position(0);
-    assert!(pacman_pos.is_some());
-    assert!(pacman_pos.unwrap().x < BOARD_CELL_SIZE.x);
-    assert!(pacman_pos.unwrap().y < BOARD_CELL_SIZE.y);
-
-    let nonexistent_pos = map.find_starting_position(99);
-    assert_eq!(nonexistent_pos, None);
-}
-
 #[test]
 fn test_map_node_positions() {
     let map = Map::new(RAW_BOARD).unwrap();

tests/parser.rs

@@ -1,5 +1,6 @@
 use pacman::constants::{BOARD_CELL_SIZE, RAW_BOARD};
-use pacman::map::parser::{MapTileParser, ParseError};
+use pacman::error::ParseError;
+use pacman::map::parser::MapTileParser;
 
 #[test]
 fn test_parse_character() {