feat(lib): carry audio attributes in browse and folder listings

A browse listed each file as a name and a size, so a searcher who saw a
bitrate in a search reply lost it the moment they opened the sharer's
files. Listings (codes 5 and 37) now carry each file's attributes the
way Nicotine+ sends them, as a SharedFileEntry with name, size and
attributes in place of the (name, size) pair; the CLI's browse record
gains bitrate and duration, and the daemon protocol moves to version 2
for the new listing shape.

soulseek-rs/src/ui/main_tui/mod.rs

@@ -1628,7 +1628,13 @@ mod tests {
         tui.state.browse.open("bob");
         let listing = vec![soulseek_rs::SharedDirectory {
             name: "Music".to_string(),
-            files: (0..files).map(|i| (format!("{i:02}.mp3"), 1)).collect(),
+            files: (0..files)
+                .map(|i| soulseek_rs::SharedFileEntry {
+                    name: format!("{i:02}.mp3"),
+                    size: 1,
+                    attributes: Vec::new(),
+                })
+                .collect(),
         }];
         tui.state
             .browse