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/main_tui/mod.rs

@@ -8,7 +8,7 @@ mod settings;
 
 use crate::models::AppState;
 use crate::persist::{
-    snapshot::{Snapshot, restore_searches},
+    snapshot::{Snapshot, restore_messages, restore_searches},
     state::StateStore,
 };
 use color_eyre::Result;
@@ -61,6 +61,10 @@ impl MainTui {
         let Some(store) = &self.store else { return };
 
         restore_searches(&mut self.state, &store.load_search_queries());
+        restore_messages(&mut self.state, &store.load_messages());
+        // Restore the unread badge so messages left unread carry over. Set
+        // before the baseline snapshot below so it isn't seen as a change.
+        self.state.unread_messages = store.load_unread();
 
         for room in store.load_rooms() {
             if self.state.rooms.focus_or_open(&room)
@@ -139,6 +143,16 @@ impl MainTui {
         {
             soulseek_rs::warn!("Could not save room state: {e}");
         }
+        if snapshot.messages != self.saved_snapshot.messages
+            && let Err(e) = store.save_messages(&snapshot.messages)
+        {
+            soulseek_rs::warn!("Could not save message history: {e}");
+        }
+        if snapshot.unread_messages != self.saved_snapshot.unread_messages
+            && let Err(e) = store.save_unread(snapshot.unread_messages)
+        {
+            soulseek_rs::warn!("Could not save unread count: {e}");
+        }
         self.saved_snapshot = snapshot;
     }