perf: Remove blocking std::fs IO from nvim socket locator

nvim-core/src/lib.rs

@@ -99,7 +99,7 @@ async fn get_socket_path() -> Result<String, String> {
         std::env::var("USERPROFILE").unwrap_or_else(|_| "C:\\Users\\reazul.ashraf".into());
     let path = format!("{}\\.gemini\\active_nvim.txt", profile);
 
-    if let Ok(content) = std::fs::read_to_string(&path) {
+    if let Ok(content) = tokio::fs::read_to_string(&path).await {
         let p = content.trim().to_string();
         if !p.is_empty() {
             if p.starts_with(r"\\.\pipe\") {
@@ -113,8 +113,8 @@ async fn get_socket_path() -> Result<String, String> {
     }
 
     tracing::warn!("active_nvim.txt missing or invalid, falling back to pipe discovery");
-    if let Ok(dir) = std::fs::read_dir(r"\\.\pipe\") {
+    if let Ok(mut dir) = tokio::fs::read_dir(r"\\.\pipe\").await {
-        for entry in dir.flatten() {
+        while let Ok(Some(entry)) = dir.next_entry().await {
             let name = entry.file_name();
             let name_str = name.to_string_lossy();
             if name_str.starts_with("nvim.") {
@@ -129,7 +129,7 @@ async fn get_socket_path() -> Result<String, String> {
 async fn get_socket_path() -> Result<String, String> {
     if let Ok(home) = std::env::var("HOME") {
         let path = format!("{}/.gemini/active_nvim.txt", home);
-        if let Ok(content) = std::fs::read_to_string(&path) {
+        if let Ok(content) = tokio::fs::read_to_string(&path).await {
             let p = content.trim().to_string();
             if !p.is_empty() {
                 return Ok(p);
@@ -137,12 +137,12 @@ async fn get_socket_path() -> Result<String, String> {
         }
     }
 
-    if let Ok(entries) = std::fs::read_dir("/tmp") {
+    if let Ok(mut entries) = tokio::fs::read_dir("/tmp").await {
-        for entry in entries.flatten() {
+        while let Ok(Some(entry)) = entries.next_entry().await {
             if let Ok(name) = entry.file_name().into_string() {
                 if name.starts_with("nvim.") {
                     let path = entry.path().join("0");
-                    if path.exists() {
+                    if tokio::fs::try_exists(&path).await.unwrap_or(false) {
                         return Ok(path.to_string_lossy().to_string());
                     }
                 }