Fix: Resolve Tauri Error 1412 (Chrome_WidgetWin_0) on Windows 11

- Add tauri-plugin-single-instance to prevent multiple WebView2 instances
- Configure single-instance behavior to focus existing window
- Add window label and skipTaskbar configuration for proper lifecycle
- This fixes the window closing prematurely before connecting to backend

Fixes #1147

Author: pranitaurlam

frontend/src-tauri/Cargo.toml

@@ -37,6 +37,7 @@ tauri-plugin-process = "2.3.1"
 tauri-plugin-store = "2.4.1"
 tauri-plugin-updater = "2.9.0"
 tauri-plugin-opener = "2.5.2"
+tauri-plugin-single-instance = "2.3.1"
 
 [features]
 # This feature is used for production builds or when a dev server is not specified, DO NOT REMOVE!!

frontend/src-tauri/src/main.rs

@@ -190,6 +190,16 @@ fn prod(_app: &tauri::AppHandle, _resource_path: &std::path::Path) -> Result<(),
 
 fn main() {
     tauri::Builder::default()
+        .plugin(tauri_plugin_single_instance::init(|app, _args, _cwd| {
+            // When a second instance is launched, focus the primary instance's window
+            let windows = app.webview_windows();
+            windows
+                .values()
+                .next()
+                .expect("no window found")
+                .set_focus()
+                .expect("failed to set focus");
+        }))
         .plugin(tauri_plugin_opener::init())
         .plugin(tauri_plugin_updater::Builder::new().build())
         .plugin(tauri_plugin_store::Builder::new().build())

frontend/src-tauri/tauri.conf.json

@@ -46,6 +46,7 @@
   "app": {
     "windows": [
       {
+        "label": "main",
         "title": "PictoPy",
         "width": 800,
         "height": 600,
@@ -54,6 +55,7 @@
         "resizable": true,
         "fullscreen": false,
         "maximized": false,
+        "skipTaskbar": false,
         "devtools": true
       }
     ],