Add download progress and graceful tray shutdown

- proton: wrap the download sink in a small ProgressWriter that prints
  percent / MiB to stderr every 1 MiB so the ~600 MB GE-Proton pull isn't
  silent for minutes. No extra deps.
- tray: store the ksni Handle on the tray itself so Quit can call
  shutdown() before exit(), unregistering the SNI item from D-Bus instead
  of leaving a stale entry until the session bus notices the PID is gone.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/proton.rs

@@ -79,9 +79,12 @@ fn install_version(config: &Config, tag: &str) -> Result<()> {
             .context("Download failed")?
             .error_for_status()
             .context("Download returned an error status")?;
-        let mut f = std::fs::File::create(&tmp_path)
+        let total = resp.content_length();
+        let f = std::fs::File::create(&tmp_path)
             .with_context(|| format!("Failed to create temp file {tmp_path:?}"))?;
-        std::io::copy(&mut resp, &mut f).context("Failed to stream archive to disk")?;
+        let mut progress = ProgressWriter::new(f, total);
+        std::io::copy(&mut resp, &mut progress).context("Failed to stream archive to disk")?;
+        progress.finish();
     }
 
     println!("Extracting to {:?}...", config.proton_compat_dir);
@@ -156,6 +159,55 @@ fn print_list(config: &Config) -> Result<()> {
     Ok(())
 }
 
+/// Wraps a writer to print download progress to stderr, throttled to one
+/// update per megabyte so we don't spam the terminal.
+struct ProgressWriter<W: Write> {
+    inner: W,
+    total: Option<u64>,
+    written: u64,
+    last_print: u64,
+}
+
+impl<W: Write> ProgressWriter<W> {
+    fn new(inner: W, total: Option<u64>) -> Self {
+        Self { inner, total, written: 0, last_print: 0 }
+    }
+
+    fn finish(&mut self) {
+        let _ = self.inner.flush();
+        // Clear the progress line — the caller's next println! starts fresh.
+        eprintln!();
+    }
+}
+
+impl<W: Write> Write for ProgressWriter<W> {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        let n = self.inner.write(buf)?;
+        self.written += n as u64;
+        if self.written - self.last_print >= 1 << 20 {
+            self.last_print = self.written;
+            match self.total {
+                Some(t) => {
+                    let pct = (self.written as f64 / t as f64) * 100.0;
+                    eprint!(
+                        "\r  {:.1}% ({} / {} MiB)",
+                        pct,
+                        self.written >> 20,
+                        t >> 20,
+                    );
+                }
+                None => eprint!("\r  {} MiB", self.written >> 20),
+            }
+            let _ = std::io::stderr().flush();
+        }
+        Ok(n)
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        self.inner.flush()
+    }
+}
+
 fn pick_interactively(config: &Config) -> Result<String> {
     let releases = fetch_releases(10)?;
     if releases.is_empty() {

src/tray.rs

@@ -7,6 +7,9 @@ pub struct BattlenetTray {
     pub config: Config,
     /// Whether Battle.net is currently running; updated by background poller.
     pub running: bool,
+    /// Set after the service spawns so Quit can shut down the SNI item
+    /// cleanly instead of yanking it off the bus via exit().
+    pub handle: Option<ksni::Handle<BattlenetTray>>,
 }
 
 impl ksni::Tray for BattlenetTray {
@@ -113,8 +116,18 @@ impl ksni::Tray for BattlenetTray {
             StandardItem {
                 label: "Quit".into(),
                 icon_name: "application-exit".into(),
-                activate: Box::new(|_this: &mut Self| {
-                    std::process::exit(0);
+                activate: Box::new(|this: &mut Self| {
+                    if let Some(h) = this.handle.clone() {
+                        // Run shutdown off-thread: we're currently holding
+                        // the tray lock inside update(), and shutdown wants
+                        // the service loop to turn.
+                        thread::spawn(move || {
+                            h.shutdown();
+                            std::process::exit(0);
+                        });
+                    } else {
+                        std::process::exit(0);
+                    }
                 }),
                 ..Default::default()
             }
@@ -130,6 +143,7 @@ pub fn run(config: &Config) -> Result<()> {
     let tray = BattlenetTray {
         config: config.clone(),
         running: launcher::is_running(),
+        handle: None,
     };
 
     let service = ksni::TrayService::new(tray);
@@ -137,10 +151,17 @@ pub fn run(config: &Config) -> Result<()> {
     let handle = service.handle();
     service.spawn();
 
+    // Hand the tray a clone of its own handle so Quit can shut down cleanly.
+    let handle_for_self = handle.clone();
+    handle.update(move |t: &mut BattlenetTray| {
+        t.handle = Some(handle_for_self);
+    });
+
     // Background thread: poll Battle.net process state every 2 s and update the tray.
+    let poll_handle = handle;
     thread::spawn(move || loop {
         let running = launcher::is_running();
-        handle.update(|tray: &mut BattlenetTray| {
+        poll_handle.update(|tray: &mut BattlenetTray| {
             tray.running = running;
         });
         thread::sleep(Duration::from_secs(2));