Add native screen recording with themed top-bar controls

portal/src/record_main.rs

@@ -0,0 +1,14 @@
+//! Native recording client. The portal retains capture authorization; encoding
+//! and file I/O live in this separate process, never in the shell render loop.
+mod recorder;
+
+fn main() {
+    if let Err(error) = tokio::runtime::Runtime::new().and_then(|runtime| {
+        runtime
+            .block_on(recorder::run())
+            .map_err(std::io::Error::other)
+    }) {
+        recorder::event("error", Some(&error.to_string()), None);
+        std::process::exit(1);
+    }
+}