feat: implement real-time LED strip preview

- Add LED strip visualization around display previews
- Show real-time color status for each LED pixel
- Support multi-display LED strip configurations
- Use elegant 16px thin LED strip design
- Real-time LED color sync via WebSocket
- Responsive layout with display scaling support

src-tauri/src/display/manager.rs

@@ -2,7 +2,7 @@ use std::{env::current_dir, sync::Arc, time::Duration};
 
 use ddc_hi::Display;
 use paris::{error, info, warn};
-use tauri::api::path::config_dir;
+use dirs::config_dir;
 use tokio::{
     sync::{broadcast, watch, OnceCell, RwLock},
     task::yield_now,