fix: resolve clippy warnings

- Add Default derive for OverlayManager instead of manual implementation
- Add Default derive for TimerUsage instead of manual implementation
- Follows clippy's recommendations for cleaner, more idiomatic code

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fcoury

.hookman/hooks/pre-push.toml

@@ -0,0 +1,5 @@
+hook_type = "pre-push"
+
+[[commands]]
+id = "clippy"
+command = "cargo clippy"

src/plugin/overlay.rs

@@ -158,17 +158,15 @@ impl PluginOverlay {
     }
 }
 
+#[derive(Default)]
 pub struct OverlayManager {
     overlays: HashMap<String, PluginOverlay>,
     z_order: Vec<String>, // Track rendering order
 }
 
 impl OverlayManager {
     pub fn new() -> Self {
-        Self {
-            overlays: HashMap::new(),
-            z_order: Vec::new(),
-        }
+        Self::default()
     }
 
     pub fn create_overlay(&mut self, id: String, config: OverlayConfig) -> &mut PluginOverlay {

src/plugin/timer_stats.rs

@@ -5,25 +5,14 @@ lazy_static::lazy_static! {
     static ref TIMER_STATS: Mutex<HashMap<String, TimerUsage>> = Mutex::new(HashMap::new());
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub struct TimerUsage {
     pub active_timeouts: usize,
     pub active_intervals: usize,
     pub total_created: usize,
     pub total_cleared: usize,
 }
 
-impl Default for TimerUsage {
-    fn default() -> Self {
-        Self {
-            active_timeouts: 0,
-            active_intervals: 0,
-            total_created: 0,
-            total_cleared: 0,
-        }
-    }
-}
-
 pub fn record_timer_created(plugin_name: &str, is_interval: bool) {
     let mut stats = TIMER_STATS.lock().unwrap();
     let usage = stats.entry(plugin_name.to_string()).or_default();