refactor: eliminate code duplication - extract helpers and use retry utils

Extracted duplicate code and unified timeout handling across the codebase.

Changes:
- Extracted open_chat_and_load_data() function (eliminates 52 lines of duplication)
- Replaced manual y/н/Enter handling with handle_yes_no() from modal_handler (2 places)
- Replaced 7 direct tokio::time::timeout calls with retry utils (auth, main_input, main)
- Added with_timeout_ignore() for non-critical operations
- Fixed modal_handler.rs bug: corrected Russian 'y' key (д → н)
- Removed unused imports in handlers/mod.rs and utils/mod.rs

Impact:
- main_input.rs: 1164 → 958 lines (-206 lines, -18%)
- Code duplication: 52 lines eliminated
- Direct timeout calls: 7 → 1 (-86%)
- DRY principle applied throughout

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

src/input/auth.rs

@@ -1,8 +1,8 @@
 use crate::app::App;
 use crate::tdlib::{AuthState, TdClientTrait};
+use crate::utils::with_timeout_msg;
 use crossterm::event::KeyCode;
 use std::time::Duration;
-use tokio::time::timeout;
 
 pub async fn handle<T: TdClientTrait>(app: &mut App<T>, key_code: KeyCode) {
     match &app.td_client.auth_state() {
@@ -18,24 +18,21 @@ pub async fn handle<T: TdClientTrait>(app: &mut App<T>, key_code: KeyCode) {
             KeyCode::Enter => {
                 if !app.phone_input.is_empty() {
                     app.status_message = Some("Отправка номера...".to_string());
-                    match timeout(
+                    match with_timeout_msg(
                         Duration::from_secs(10),
                         app.td_client.send_phone_number(app.phone_input.clone()),
+                        "Таймаут отправки номера",
                     )
                     .await
                     {
-                        Ok(Ok(_)) => {
+                        Ok(_) => {
                             app.error_message = None;
                             app.status_message = None;
                         }
-                        Ok(Err(e)) => {
+                        Err(e) => {
                             app.error_message = Some(e);
                             app.status_message = None;
                         }
-                        Err(_) => {
-                            app.error_message = Some("Таймаут".to_string());
-                            app.status_message = None;
-                        }
                     }
                 }
             }
@@ -53,24 +50,21 @@ pub async fn handle<T: TdClientTrait>(app: &mut App<T>, key_code: KeyCode) {
             KeyCode::Enter => {
                 if !app.code_input.is_empty() {
                     app.status_message = Some("Проверка кода...".to_string());
-                    match timeout(
+                    match with_timeout_msg(
                         Duration::from_secs(10),
                         app.td_client.send_code(app.code_input.clone()),
+                        "Таймаут проверки кода",
                     )
                     .await
                     {
-                        Ok(Ok(_)) => {
+                        Ok(_) => {
                             app.error_message = None;
                             app.status_message = None;
                         }
-                        Ok(Err(e)) => {
+                        Err(e) => {
                             app.error_message = Some(e);
                             app.status_message = None;
                         }
-                        Err(_) => {
-                            app.error_message = Some("Таймаут".to_string());
-                            app.status_message = None;
-                        }
                     }
                 }
             }
@@ -88,24 +82,21 @@ pub async fn handle<T: TdClientTrait>(app: &mut App<T>, key_code: KeyCode) {
             KeyCode::Enter => {
                 if !app.password_input.is_empty() {
                     app.status_message = Some("Проверка пароля...".to_string());
-                    match timeout(
+                    match with_timeout_msg(
                         Duration::from_secs(10),
                         app.td_client.send_password(app.password_input.clone()),
+                        "Таймаут проверки пароля",
                     )
                     .await
                     {
-                        Ok(Ok(_)) => {
+                        Ok(_) => {
                             app.error_message = None;
                             app.status_message = None;
                         }
-                        Ok(Err(e)) => {
+                        Err(e) => {
                             app.error_message = Some(e);
                             app.status_message = None;
                         }
-                        Err(_) => {
-                            app.error_message = Some("Таймаут".to_string());
-                            app.status_message = None;
-                        }
                     }
                 }
             }