feat: add TreeSitterLanguageError support

- Add TreeSitterLanguageError variant to GitTypeError enum
- Handle language error in game command error handling
- Support tree-sitter parser creation errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: unhappychoice

src/cli/commands/game.rs

@@ -96,5 +96,8 @@ fn handle_game_error(e: GitTypeError) -> Result<()> {
         GitTypeError::WalkDirError(walk_error) => {
             panic!("Directory walk error: {}", walk_error);
         }
+        GitTypeError::TreeSitterLanguageError(lang_error) => {
+            panic!("Tree-sitter language error: {}", lang_error);
+        }
     }
 }

src/error.rs

@@ -34,6 +34,9 @@ pub enum GitTypeError {
 
     #[error("Invalid repository format: {0}")]
     InvalidRepositoryFormat(String),
+
+    #[error("Tree-sitter language error: {0}")]
+    TreeSitterLanguageError(#[from] tree_sitter::LanguageError),
 }
 
 pub type Result<T> = std::result::Result<T, GitTypeError>;