diff --git a/src/api/completions.rs b/src/api/completions.rs
index 9ce14e9..9983499 100644
--- a/src/api/completions.rs
+++ b/src/api/completions.rs
@@ -233,7 +233,7 @@ async fn chat_completions_stream(
                                     "finish_reason": "stop",
                                 }],
                             })).unwrap_or_default()));
-                            yield Ok(Event::default().data("[DONE]".to_string()));
+                            yield Ok(Event::default().data("[DONE]"));
                             return;
                         }
 
@@ -257,7 +257,7 @@ async fn chat_completions_stream(
                                                 "finish_reason": "stop",
                                             }],
                                         })).unwrap_or_default()));
-                                        yield Ok(Event::default().data("[DONE]".to_string()));
+                                        yield Ok(Event::default().data("[DONE]"));
                                         return;
                                     }
                                 }
@@ -284,7 +284,7 @@ async fn chat_completions_stream(
                 "finish_reason": "stop",
             }],
         })).unwrap_or_default()));
-        yield Ok(Event::default().data("[DONE]".to_string()));
+        yield Ok(Event::default().data("[DONE]"));
     };
 
     Sse::new(stream)
diff --git a/src/api/polling.rs b/src/api/polling.rs
index 6e6c45e..8910357 100644
--- a/src/api/polling.rs
+++ b/src/api/polling.rs
@@ -237,14 +237,14 @@ pub(crate) async fn poll_for_response(
                                 info!(
                                     "Response done ({short_id}), {:.1}s, {} chars, tokens: {}in/{}out ({}){}{}",
                                     elapsed, text.len(), u.input_tokens, u.output_tokens, u.model,
-                                    if thinking.is_some() { format!(", thinking: {} chars", thinking.as_ref().unwrap().len()) } else { String::new() },
+                                    thinking.as_ref().map_or(String::new(), |t| format!(", thinking: {} chars", t.len())),
                                     if thinking_signature.is_some() { ", has sig" } else { "" }
                                 );
                             } else {
                                 info!(
                                     "Response done ({short_id}), {:.1}s, {} chars (no usage){}{}",
                                     elapsed, text.len(),
-                                    if thinking.is_some() { format!(", thinking: {} chars", thinking.as_ref().unwrap().len()) } else { String::new() },
+                                    thinking.as_ref().map_or(String::new(), |t| format!(", thinking: {} chars", t.len())),
                                     if thinking_signature.is_some() { ", has sig" } else { "" }
                                 );
                             }
diff --git a/src/api/responses.rs b/src/api/responses.rs
index 5da0421..a8073c8 100644
--- a/src/api/responses.rs
+++ b/src/api/responses.rs
@@ -206,7 +206,7 @@ pub(crate) async fn handle_responses(
         .send_message(&cascade_id, &user_text, model.model_enum)
         .await
     {
-        Ok((status, _)) if status == 200 => {
+        Ok((200, _)) => {
             let bg = Arc::clone(&state.backend);
             let cid = cascade_id.clone();
             tokio::spawn(async move {
diff --git a/src/api/types.rs b/src/api/types.rs
index b076484..328d670 100644
--- a/src/api/types.rs
+++ b/src/api/types.rs
@@ -141,6 +141,7 @@ pub(crate) struct OutputTokensDetails {
 }
 
 #[derive(Serialize, Clone)]
+#[derive(Default)]
 pub(crate) struct Reasoning {
     pub effort: Option<String>,
     pub summary: Option<String>,
@@ -161,8 +162,8 @@ impl Usage {
     /// Estimate token counts from actual text.
     /// Uses ~4 chars/token heuristic (standard GPT tokenizer average).
     pub fn estimate(input_text: &str, output_text: &str) -> Self {
-        let input_tokens = (input_text.len() as u64 + 3) / 4;
-        let output_tokens = (output_text.len() as u64 + 3) / 4;
+        let input_tokens = (input_text.len() as u64).div_ceil(4);
+        let output_tokens = (output_text.len() as u64).div_ceil(4);
         Self {
             input_tokens,
             input_tokens_details: InputTokensDetails { cached_tokens: 0 },
@@ -189,14 +190,6 @@ impl Default for Usage {
     }
 }
 
-impl Default for Reasoning {
-    fn default() -> Self {
-        Self {
-            effort: None,
-            summary: None,
-        }
-    }
-}
 
 impl Default for TextFormat {
     fn default() -> Self {
diff --git a/src/mitm/proto.rs b/src/mitm/proto.rs
index a3ed81c..2bff9ad 100644
--- a/src/mitm/proto.rs
+++ b/src/mitm/proto.rs
@@ -227,10 +227,7 @@ fn looks_like_valid_message(fields: &[ProtoField], original_len: usize) -> bool
     // (e.g., a long string that happened to have a valid first-field prefix)
     if fields.len() == 1 && original_len > 100 {
         // Single-field messages of >100 bytes are suspicious unless the field is bytes/message
-        match &fields[0].value {
-            ProtoValue::Bytes(_) | ProtoValue::Message(_) => true,
-            _ => false,
-        }
+        matches!(&fields[0].value, ProtoValue::Bytes(_) | ProtoValue::Message(_))
     } else {
         true
     }
diff --git a/src/mitm/proxy.rs b/src/mitm/proxy.rs
index 3de41d0..464194a 100644
--- a/src/mitm/proxy.rs
+++ b/src/mitm/proxy.rs
@@ -46,6 +46,7 @@ const PASSTHROUGH_DOMAINS: &[&str] = &[
 ];
 
 /// Configuration for the MITM proxy.
+#[derive(Default)]
 pub struct MitmConfig {
     /// Port to listen on (0 = auto-assign).
     pub port: u16,
@@ -53,14 +54,6 @@ pub struct MitmConfig {
     pub modify_requests: bool,
 }
 
-impl Default for MitmConfig {
-    fn default() -> Self {
-        Self {
-            port: 0,
-            modify_requests: false,
-        }
-    }
-}
 
 /// Run the MITM proxy server.
 ///
@@ -405,7 +398,7 @@ async fn handle_http_over_tls(
     async fn resolve_upstream(domain: &str) -> String {
         // 1. Try dig @8.8.8.8 (bypasses /etc/hosts)
         if let Ok(output) = tokio::process::Command::new("dig")
-            .args(["+short", &format!("@8.8.8.8"), domain])
+            .args(["+short", "@8.8.8.8", domain])
             .output()
             .await
         {
diff --git a/src/snapshot.rs b/src/snapshot.rs
index 7008734..857f7ac 100644
--- a/src/snapshot.rs
+++ b/src/snapshot.rs
@@ -102,12 +102,11 @@ impl Snapshot {
             }
 
             // LS process logs
-            if line.starts_with('I') || line.starts_with('W') || line.starts_with('E') {
-                if line.len() > 4 && line.chars().nth(1).map_or(false, |c| c.is_ascii_digit()) {
+            if (line.starts_with('I') || line.starts_with('W') || line.starts_with('E'))
+                && line.len() > 4 && line.chars().nth(1).is_some_and(|c| c.is_ascii_digit()) {
                     snap.ls_logs.push(line.to_string());
                     continue;
                 }
-            }
             if line.contains("maxprocs:") {
                 snap.ls_logs.push(line.to_string());
                 continue;