feat: add uptime to title

it will be displayed somewhere else later,
hopefully with better formatting too.

src/app/mod.rs

@@ -1,3 +1,5 @@
+use std::time::Duration;
+
 use iced::{
     Color, Element, Length, Renderer, Task, Theme, application, futures::SinkExt, stream, theme,
     widget,
@@ -14,6 +16,8 @@ enum Message {
 
 #[derive(Default)]
 struct State {
+    uptime: Duration,
+
     total_cpu_graph: Graph,
     cpu_graphs: Vec<Graph>,
     memory_graph: Graph,
@@ -47,6 +51,8 @@ impl State {
     fn update(&mut self, message: Message) -> Task<Message> {
         match message {
             Message::Info(snapshot) => {
+                self.uptime = snapshot.uptime();
+
                 self.total_cpu_graph.update(snapshot.cpu_total);
 
                 self.memory_graph
@@ -103,10 +109,15 @@ impl State {
         ])
         .into()
     }
+
+    fn title(&self) -> String {
+        format!("itop {:?}", self.uptime)
+    }
 }
 
 pub fn run() -> Result<(), impl std::error::Error> {
     application(State::new, State::update, State::view)
+        .title(State::title)
         .theme(theme::Theme::custom(
             "high-contrast-dark",
             theme::Palette {