rust: app crate scaffolding, terminal colour schemes

rust/app/build.rs

@@ -0,0 +1,14 @@
+//! Embeds the icon and version info into the Windows executable.
+fn main() {
+    println!("cargo:rerun-if-changed=../packaging/windows/nexus.ico");
+    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("windows") {
+        let mut res = winresource::WindowsResource::new();
+        if std::path::Path::new("../packaging/windows/nexus.ico").exists() {
+            res.set_icon("../packaging/windows/nexus.ico");
+        }
+        res.set("ProductName", "Nexus Terminal").set("FileDescription", "Nexus Terminal");
+        if let Err(e) = res.compile() {
+            println!("cargo:warning=Windows icon not embedded: {e}");
+        }
+    }
+}