Fix volume spam: deduplicate set_volume calls in backend

- Skip setting volume if already at same value (0.001 tolerance)
- Skip logging when volume unchanged
- Prevents MPRIS/PipeWire feedback loop spam

src-tauri/src/commands/playback.rs

@@ -828,7 +828,11 @@ pub fn set_media_metadata(
 /// Set volume (0.0 - 1.0)
 #[tauri::command]
 pub fn set_volume(volume: f32, state: State<'_, AppState>) -> Result<(), String> {
-    log::info!("Command: set_volume {}", volume);
+    // Skip logging if volume is the same (reduces log spam from MPRIS polling)
+    let current = state.player.state.volume();
+    if (volume - current).abs() >= 0.001 {
+        log::info!("Command: set_volume {}", volume);
+    }
     state.player.set_volume(volume)
 }
 

src-tauri/src/player/mod.rs

@@ -1909,6 +1909,13 @@ impl Player {
     /// Set volume (0.0 - 1.0)
     pub fn set_volume(&self, volume: f32) -> Result<(), String> {
         let clamped = volume.clamp(0.0, 1.0);
+
+        // Skip if volume is already at this value (prevents MPRIS/PipeWire feedback loop)
+        let current = self.state.volume();
+        if (clamped - current).abs() < 0.001 {
+            return Ok(());
+        }
+
         self.tx
             .send(AudioCommand::SetVolume(clamped))
             .map_err(|e| format!("Failed to send volume command: {}", e))