Embed app icon in Windows executable

build.rs

@@ -0,0 +1,27 @@
+fn main() {
+    // Embed icon on Windows (via windres for cross-compilation support)
+    #[cfg(target_os = "windows")]
+    {
+        let out_dir = std::env::var("OUT_DIR").unwrap();
+        let rc_path = "resources/app.rc";
+        let res_path = format!("{}/app.res", out_dir);
+        let status = std::process::Command::new("x86_64-w64-mingw32-windres")
+            .args([rc_path, "-O", "coff", "-o", &res_path])
+            .status();
+        if let Ok(s) = status {
+            if s.success() {
+                println!("cargo:rustc-link-arg={}", res_path);
+                return;
+            }
+        }
+        // Fallback: try plain windres
+        let status = std::process::Command::new("windres")
+            .args([rc_path, "-O", "coff", "-o", &res_path])
+            .status();
+        if let Ok(s) = status {
+            if s.success() {
+                println!("cargo:rustc-link-arg={}", res_path);
+            }
+        }
+    }
+}

resources/app.rc

@@ -0,0 +1 @@
+1 ICON "app.ico"