fix(lsp): avoid panic when current_dir is unavailable

Author: Copilot

crates/lsp/src/lib.rs

@@ -128,7 +128,9 @@ impl LanguageServer {
         let config = load_config(workspace_root.as_deref());
 
         #[cfg(not(target_arch = "wasm32"))]
-        let workspace_root = workspace_root.unwrap_or_else(|| std::env::current_dir().unwrap());
+        let workspace_root = workspace_root.unwrap_or_else(|| {
+            std::env::current_dir().unwrap_or_else(|_| PathBuf::from("."))
+        });
 
         #[cfg(target_arch = "wasm32")]
         let _ = workspace_root;