Fix clippy warnings

- Remove unused imports in export.rs, claude.rs, email.rs
- Remove needless borrows in error responses
- Replace useless vec! with array in email_templates.rs

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: platinummonkey

src/handlers/email_templates.rs

@@ -101,7 +101,7 @@ pub async fn create_email_template(
     }
 
     // Validate template_type is a valid enum value
-    let valid_types = vec![
+    let valid_types = [
         "submission_confirmation",
         "talk_accepted",
         "talk_rejected",
@@ -112,7 +112,7 @@ pub async fn create_email_template(
     if !valid_types.contains(&payload.template_type.as_str()) {
         return Err((
             StatusCode::BAD_REQUEST,
-            Json(ErrorResponse::new(&format!(
+            Json(ErrorResponse::new(format!(
                 "Invalid template type. Must be one of: {}",
                 valid_types.join(", ")
             ))),

src/handlers/export.rs

@@ -7,7 +7,7 @@ use serde::{Deserialize, Serialize};
 use sqlx::Row;
 use uuid::Uuid;
 
-use crate::{api::AppState, models::talk::TalkState};
+use crate::api::AppState;
 
 #[derive(Debug, Deserialize)]
 pub struct ExportQuery {

src/handlers/talks.rs

@@ -648,7 +648,7 @@ pub async fn change_talk_state(
     if !talk.state.can_transition_to(&payload.new_state) {
         return Err((
             StatusCode::BAD_REQUEST,
-            Json(ErrorResponse::new(&format!(
+            Json(ErrorResponse::new(format!(
                 "Invalid state transition: cannot move from {:?} to {:?}",
                 talk.state, payload.new_state
             ))),

src/services/claude.rs

@@ -1,6 +1,5 @@
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
-use serde_json::json;
 
 use crate::config::Config;
 

src/services/email.rs

@@ -4,7 +4,6 @@ use lettre::{
     AsyncTransport, Message, Tokio1Executor,
 };
 use serde::{Deserialize, Serialize};
-use serde_json::json;
 use sqlx::PgPool;
 use std::{collections::HashMap, sync::Arc};
 use uuid::Uuid;