fix: replace unsafe env::set_var with thread-safe OnceLock

Resolves intermittent STATUS_HEAP_CORRUPTION on Windows by using a static OnceLock map instead of mutating the global OS environment block.

server/src/api/telemetry.rs

@@ -146,7 +146,7 @@ pub async fn nvim_telemetry_handler(
             let _ = tokio::fs::write(wsl_path, session).await;
         } else {
             let profile =
-                std::env::var("USERPROFILE").unwrap_or_else(|_| "C:\\Users\\reazul.ashraf".into());
+                crate::config::get_env("USERPROFILE").unwrap_or_else(|_| "C:\\Users\\reazul.ashraf".into());
             let win_path = format!("{}\\.gemini\\active_nvim.txt", profile);
             let _ = tokio::fs::write(&win_path, session).await;
         }