Fix clippy warnings: needless lifetime, sort_by_key, dead_code guard field

- find_block: elide the unnecessary 'a lifetime
- scan_wifi: use sort_by_key(Reverse) instead of sort_by for the signal-descending sort
- WatcherHandle: mark the RecommendedWatcher field as intentionally unread —
  it's held only to keep the watcher alive for the process lifetime, never
  accessed directly

src/src/commands/breadbar.rs

@@ -33,7 +33,7 @@ pub struct BreadbarStyle {
     pub notification_border_radius: u32,
 }
 
-fn find_block<'a>(css: &'a str, selector: &str) -> Option<(usize, usize)> {
+fn find_block(css: &str, selector: &str) -> Option<(usize, usize)> {
     let pat = format!(r"(?m)^\s*{}\s*\{{", regex::escape(selector));
     let re = Regex::new(&pat).ok()?;
     let m = re.find(css)?;

src/src/commands/network.rs

@@ -89,7 +89,7 @@ pub async fn scan_wifi() -> Vec<WifiNetwork> {
         by_ssid.entry(ssid.to_string()).and_modify(|existing| if net.signal > existing.signal { *existing = net.clone() }).or_insert(net);
     }
     let mut list: Vec<_> = by_ssid.into_values().collect();
-    list.sort_by(|a, b| b.signal.cmp(&a.signal));
+    list.sort_by_key(|n| std::cmp::Reverse(n.signal));
     list
 }
 

src/src/commands/theme.rs

@@ -128,7 +128,7 @@ pub fn watch_and_emit(app: &AppHandle) {
     app.manage(WatcherHandle(watcher));
 }
 
-struct WatcherHandle(RecommendedWatcher);
+struct WatcherHandle(#[allow(dead_code)] RecommendedWatcher);
 
 fn tracing_or_eprintln(msg: &str) {
     eprintln!("{msg}");