chore(providers): clear standing clippy warnings

Pre-existing nits surfaced by recent clippy runs. No behavior change:

- application/command/systemd: sort_by(|a,b| a.name.to_lowercase().cmp(...))
  → sort_by_key(|i| i.name.to_lowercase()). The key form computes
  to_lowercase() once per element instead of twice per comparison.
- providers/mod.rs (6 sites): descending score sort_by(|a,b| b.1.cmp(&a.1))
  → sort_by_key(|x| std::cmp::Reverse(x.1)).
- dmenu: add impl Default for DmenuProvider delegating to ::new().

cargo clippy now silent under --features full, --features lua, and
--no-default-features. 268/268 lib tests still green.

crates/owlry/src/providers/application.rs

@@ -228,8 +228,7 @@ impl Provider for ApplicationProvider {
         );
 
         // Sort alphabetically by name
-        self.items
-            .sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
+        self.items.sort_by_key(|i| i.name.to_lowercase());
     }
 
     fn items(&self) -> &[LaunchItem] {

crates/owlry/src/providers/command.rs

@@ -99,8 +99,7 @@ impl Provider for CommandProvider {
         debug!("Found {} commands in PATH", self.items.len());
 
         // Sort alphabetically
-        self.items
-            .sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
+        self.items.sort_by_key(|i| i.name.to_lowercase());
     }
 
     fn items(&self) -> &[LaunchItem] {

crates/owlry/src/providers/dmenu.rs

@@ -8,6 +8,12 @@ pub struct DmenuProvider {
     enabled: bool,
 }
 
+impl Default for DmenuProvider {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl DmenuProvider {
     pub fn new() -> Self {
         Self {

crates/owlry/src/providers/mod.rs

@@ -416,7 +416,7 @@ impl ProviderManager {
             })
             .collect();
 
-        results.sort_by(|a, b| b.1.cmp(&a.1));
+        results.sort_by_key(|x| std::cmp::Reverse(x.1));
         results.truncate(max_results);
         results
     }
@@ -458,7 +458,7 @@ impl ProviderManager {
             })
             .collect();
 
-        results.sort_by(|a, b| b.1.cmp(&a.1));
+        results.sort_by_key(|x| std::cmp::Reverse(x.1));
         results.truncate(max_results);
         results
     }
@@ -541,14 +541,14 @@ impl ProviderManager {
                 scored_refs.select_nth_unstable_by(max_results, |a, b| b.1.cmp(&a.1));
                 scored_refs.truncate(max_results);
             }
-            scored_refs.sort_by(|a, b| b.1.cmp(&a.1));
+            scored_refs.sort_by_key(|x| std::cmp::Reverse(x.1));
 
             results.extend(
                 scored_refs
                     .into_iter()
                     .map(|(item, score)| (item.clone(), score)),
             );
-            results.sort_by(|a, b| b.1.cmp(&a.1));
+            results.sort_by_key(|x| std::cmp::Reverse(x.1));
             results.truncate(max_results);
             return results;
         }
@@ -617,14 +617,14 @@ impl ProviderManager {
             scored_refs.select_nth_unstable_by(max_results, |a, b| b.1.cmp(&a.1));
             scored_refs.truncate(max_results);
         }
-        scored_refs.sort_by(|a, b| b.1.cmp(&a.1));
+        scored_refs.sort_by_key(|x| std::cmp::Reverse(x.1));
 
         results.extend(
             scored_refs
                 .into_iter()
                 .map(|(item, score)| (item.clone(), score)),
         );
-        results.sort_by(|a, b| b.1.cmp(&a.1));
+        results.sort_by_key(|x| std::cmp::Reverse(x.1));
         results.truncate(max_results);
 
         #[cfg(feature = "dev-logging")]

crates/owlry/src/providers/systemd.rs

@@ -128,8 +128,7 @@ impl Provider for SystemdProvider {
 
         let stdout = String::from_utf8_lossy(&output.stdout);
         self.items = Self::parse_systemctl_output(&stdout);
-        self.items
-            .sort_by(|a, b| a.name.to_lowercase().cmp(&b.name.to_lowercase()));
+        self.items.sort_by_key(|i| i.name.to_lowercase());
     }
 
     fn items(&self) -> &[LaunchItem] {