fix: remove redundant volume_state=None, improve pactl volume parser for stereo sinks

crates/ahfail-ui/src/volume.rs

@@ -69,9 +69,16 @@ fn get_current_volume() -> (u32, bool) {
 
 #[cfg(target_os = "linux")]
 fn parse_pactl_volume(output: &str) -> Option<u32> {
-    output.split('%').next()
-        .and_then(|s| s.split_whitespace().last())
-        .and_then(|s| s.parse().ok())
+    for token in output.split_whitespace() {
+        if let Some(pct) = token.strip_suffix('%') {
+            if let Ok(v) = pct.parse::<u32>() {
+                if v <= 100 {
+                    return Some(v);
+                }
+            }
+        }
+    }
+    None
 }
 
 #[cfg(target_os = "linux")]