Remove Cache prefix from cache duration display

Display cache duration as "1.5s" instead of "Cache:1.5s" in
bottom status bar for cleaner presentation alongside other
technical metrics.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-player"
-version = "0.1.16"
+version = "0.1.17"
 edition = "2021"
 
 [dependencies]

src/ui/mod.rs

@@ -536,7 +536,7 @@ fn render_status_bar(frame: &mut Frame, state: &AppState, player: &Player, area:
 
         if let Some(cache_dur) = player.cache_duration {
             if cache_dur > 0.0 {
-                right_parts.push(format!("Cache:{:.1}s", cache_dur));
+                right_parts.push(format!("{:.1}s", cache_dur));
             }
         }