fix(nvim): resolve idle zombie connection lock and adjust RPC timeout

- Remove the arbitrary 60-second read timeout on the Neovim socket that caused the read task to exit during idle periods, permanently locking the connection state.
- Automatically clear the connection state variable when the read loop breaks (e.g. true EOF), allowing get_nvim_connection() to correctly auto-reconnect on the next call.
- Increase the Neovim RPC call timeout from 10s to 30s to accommodate heavier operations (e.g., massive Lua regex substitutions) without falsely dropping the connection.

nvim-core/src/lib.rs

@@ -254,16 +254,13 @@ async fn get_nvim_connection() -> Result<mpsc::Sender<NvimRequest>, String> {
                         }
                         _ => false,
                     } =>
-                {
-                    match tokio::time::timeout(
-                        tokio::time::Duration::from_secs(60),
-                        read_half.read_buf(&mut resp_buf),
-                    )
-                    .await
-                    {
-                        Ok(Ok(n)) if n > 0 => {}
+                    match read_half.read_buf(&mut resp_buf).await {
+                        Ok(n) if n > 0 => {}
                         _ => {
-                            tracing::error!("Neovim socket read loop closed or timeout");
+                            tracing::error!("Neovim socket read loop closed or EOF");
+                            // We need to clear the connection state so the next call reconnects
+                            let mut conn = NVIM_CONN.lock().unwrap_or_else(|e| e.into_inner());
+                            *conn = None;
                             break;
                         }
                     }
@@ -372,7 +369,7 @@ async fn call_nvim(req: rmpv::Value) -> Result<rmpv::Value, String> {
     .await
     .map_err(|_| "Failed to send request to Neovim connection manager")?;
 
-    match tokio::time::timeout(tokio::time::Duration::from_secs(10), reply_rx).await {
+    match tokio::time::timeout(tokio::time::Duration::from_secs(30), reply_rx).await {
         Ok(Ok(res)) => res,
         Ok(Err(_)) => Err("Response channel dropped".to_string()),
         Err(_) => Err("Timeout waiting for Neovim response".to_string()),