feat(tui): scroll long names in every list and page through popups and chat

The sideways keys the results had (h/l, arrows, 0 and $) now scroll a
transfer's file name and a query too, each list on its own. The browse tree
and the room list take Home/End, PgUp/PgDn and the vim jumps like the main
lists, and a chat log, room or private, pages back through its history and
holds its place while new messages arrive; what arrives meanwhile counts as
unread until the reader returns to the end.

soulseek-rs/src/models/rooms.rs

@@ -1,3 +1,4 @@
+use crate::models::LogView;
 use chrono::{DateTime, Local};
 use soulseek_rs::types::{RoomEvent, RoomInfo};
 
@@ -38,6 +39,8 @@ pub struct OpenRoom {
     pub unread: usize,
     /// Per-room compose buffer.
     pub input: String,
+    /// Where the log is being read.
+    pub view: LogView,
 }
 
 impl OpenRoom {
@@ -160,6 +163,11 @@ impl RoomsState {
             .and_then(|r| r.users.get(self.user_selected).cloned())
     }
 
+    /// Where the active room's log is being read, to move it.
+    pub fn active_view_mut(&mut self) -> Option<&mut LogView> {
+        self.open.get_mut(self.active).map(|room| &mut room.view)
+    }
+
     pub const fn select_user_up(&mut self) {
         self.user_selected = self.user_selected.saturating_sub(1);
     }