step 6+7: live clock, CPU/MEM/power/battery/WiFi stats poller

src/bar/clock.rs

@@ -1 +1,16 @@
+use crate::{App, AppInput};
+use relm4::ComponentSender;
 
+pub fn current() -> String {
+    let dt = gtk4::glib::DateTime::now_local().expect("local time");
+    format!("{:02}:{:02}", dt.hour(), dt.minute())
+}
+
+pub fn spawn_ticker(sender: ComponentSender<App>) {
+    relm4::spawn(async move {
+        loop {
+            sender.input(AppInput::ClockTick);
+            tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+        }
+    });
+}