perf(tui): wrap a chat log as it arrives instead of on every frame

A room's chat log was wrapped to the pane width from the first line on
every frame, so a busy room lagged more the longer it stayed open: in
the harness 30,000 lines cost 16.6ms a frame. The wrapped rows now
live with the log and a draw only wraps the lines that arrived since
the last one, starting over when the width changes. The same cache
serves the private-message box, and the room list draws only its
visible page like the other tables. The 30,000-line room now draws in
0.4ms.

soulseek-rs/src/models/mod.rs

@@ -6,9 +6,9 @@ mod settings;
 
 pub use app_state::{
     AppState, ChatMessage, CommandBarMode, DownloadEntry, FocusedPane, LogView,
-    MessageDirection, PaneLayout, SearchEntry, SearchStatus,
+    MessageDirection, PaneLayout, SearchEntry, SearchStatus, WrappedLog,
 };
 pub use browse::{BrowseState, BrowseStatus, BrowseTabs};
 pub use file_display_data::FileDisplayData;
-pub use rooms::{RoomLine, RoomsState, RoomsView};
+pub use rooms::{OpenRoom, RoomLine, RoomsState, RoomsView};
 pub use settings::{SettingsAction, SettingsMode, SettingsState};