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/downloads_pane.rs

@@ -138,10 +138,17 @@ pub fn render_downloads_pane(
                     percent
                 )
             }
-            UploadStatus::Completed => format_bytes(upload.size),
+            UploadStatus::Completed => "Completed".to_string(),
             UploadStatus::Cancelled => "Cancelled".to_string(),
             UploadStatus::Failed(_) => "Failed".to_string(),
         };
+        // Same rule as a download: a rate only while the transfer is running.
+        let speed_text = match &upload.status {
+            UploadStatus::InProgress => {
+                format_speed(upload.speed_bytes_per_sec)
+            }
+            _ => "-".to_string(),
+        };
         let basename = upload
             .filename
             .rsplit(['\\', '/'])
@@ -152,7 +159,7 @@ pub fn render_downloads_pane(
             Cell::from(basename.to_string()).style(body_style()),
             Cell::from(upload.username.clone()).style(info_style()),
             Cell::from(progress_text).style(primary_style()),
-            Cell::from(String::new()),
+            Cell::from(speed_text).style(warning_style()),
         ])
     }));