fix: resolve all 40 clippy warnings (dead_code, unused_imports, lints)

- Add #[allow(unused_imports)] on pub re-exports used only by lib/tests
- Add #[allow(dead_code)] on public API items unused in binary target
- Fix collapsible_if, redundant_closure, unnecessary_map_or in main.rs
- Prefix unused test variables with underscore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main.rs

@@ -37,10 +37,8 @@ fn parse_account_arg() -> Option<String> {
     let args: Vec<String> = std::env::args().collect();
     let mut i = 1;
     while i < args.len() {
-        if args[i] == "--account" {
-            if i + 1 < args.len() {
-                return Some(args[i + 1].clone());
-            }
+        if args[i] == "--account" && i + 1 < args.len() {
+            return Some(args[i + 1].clone());
         }
         i += 1;
     }
@@ -161,7 +159,7 @@ async fn run_app<B: ratatui::backend::Backend, T: tdlib::TdClientTrait>(
     let polling_handle = tokio::spawn(async move {
         while !should_stop_clone.load(Ordering::Relaxed) {
             // receive() с таймаутом 0.1 сек чтобы периодически проверять флаг
-            let result = tokio::task::spawn_blocking(|| tdlib_rs::receive()).await;
+            let result = tokio::task::spawn_blocking(tdlib_rs::receive).await;
             if let Ok(Some((update, _client_id))) = result {
                 if update_tx.send(update).is_err() {
                     break; // Канал закрыт, выходим
@@ -248,7 +246,7 @@ async fn run_app<B: ratatui::backend::Backend, T: tdlib::TdClientTrait>(
 
                         // Проверяем завершение воспроизведения
                         if playback.position >= playback.duration
-                            || app.audio_player.as_ref().map_or(false, |p| p.is_stopped())
+                            || app.audio_player.as_ref().is_some_and(|p| p.is_stopped())
                         {
                             stop_playback = true;
                         }