Strip \\?\ extended-length prefix from Windows resource paths

Node.js module resolver can't handle the \\?\ prefix that Tauri's
resource_dir() returns on Windows, causing EISDIR errors. Use dunce
to simplify paths before passing them to Node.

packages/desktop/src-tauri/Cargo.lock

@@ -2633,6 +2633,7 @@ version = "0.1.25"
 dependencies = [
  "base64 0.22.1",
  "dirs",
+ "dunce",
  "futures-util",
  "http",
  "log",

packages/desktop/src-tauri/Cargo.toml

@@ -24,6 +24,7 @@ tauri-build = { version = "2.5.3", features = [] }
 [dependencies]
 base64 = "0.22"
 dirs = "6"
+dunce = "1"
 futures-util = "0.3"
 http = "1"
 serde_json = "1.0"

packages/desktop/src-tauri/src/runtime_manager.rs

@@ -560,7 +560,8 @@ fn dev_resource_root() -> PathBuf {
 }
 
 fn bundled_runtime_root(app: &AppHandle) -> Result<PathBuf, String> {
-    if let Ok(resource_dir) = app.path().resource_dir() {
+    if let Ok(raw_resource_dir) = app.path().resource_dir() {
+        let resource_dir = dunce::simplified(&raw_resource_dir).to_path_buf();
         // Tauri's bundle.resources preserves the source directory structure, so
         // "resources/**/*" in tauri.conf.json places files at
         // $RESOURCE/resources/managed-runtime/. Try the nested path first (installed