fix(peer): serve full browse listings + harden the listener; TUI transfer/UX work

Peer layer:
- Stream peer messages with a partial-write queue instead of write_all, so a
  large SharedFileListResponse over the non-blocking socket is no longer
  truncated (third-party clients like SoulseekQt can now browse our shares).
- Bound the peer-init handshake with a read timeout and handle each accepted
  connection on its own thread, so one stalled peer can't wedge the listener.
- e2e: third-party direct/brokered/large-share browse + stalled-peer coverage.

TUI:
- Uploads share the downloads table columns (real Speed) and the info pane now
  renders details for a selected upload.
- Download progress bar counts only in-progress transfers and hides when idle.
- Always-visible unread badge (private messages + rooms) in the shortcuts bar,
  self-drawn blink so it works under tmux.
- Persist the unread private-message count across restarts.

soulseek-rs/src/ui/panes/rooms_pane.rs

@@ -181,12 +181,20 @@ fn render_messages(
     let start = lines.len().saturating_sub(height.max(1));
     let rendered: Vec<Line> = lines[start..]
         .iter()
-        .map(|l| match &l.username {
-            Some(user) => Line::from(vec![
-                Span::styled(format!("<{user}> "), info_style()),
-                Span::styled(l.text.clone(), primary_style()),
-            ]),
-            None => Line::from(Span::styled(l.text.clone(), dimmed_style())),
+        .map(|l| {
+            let time =
+                Span::styled(l.at.format("%H:%M ").to_string(), dimmed_style());
+            match &l.username {
+                Some(user) => Line::from(vec![
+                    time,
+                    Span::styled(format!("<{user}> "), info_style()),
+                    Span::styled(l.text.clone(), primary_style()),
+                ]),
+                None => Line::from(vec![
+                    time,
+                    Span::styled(l.text.clone(), dimmed_style()),
+                ]),
+            }
         })
         .collect();
     frame.render_widget(Paragraph::new(rendered), area);