refactor: cleanup unused code and warnings

Comprehensive cleanup of unused methods, dead code, and compiler warnings:

## Removed Methods (15):
- Duplicate delegation methods: is_authenticated, get_typing_text, get_user_name from TdClient
- Obsolete methods: TdClient::init() (duplicated in main.rs)
- Unused getters: UserCache::{get_username, get_name, get_user_id_by_chat}
- Unused builder methods: MessageBuilder::{edited, add_reaction}
- Unused utility: ChatState::is_normal()
- Dead code: HotkeysConfig::{matches, key_matches} (kept for tests)
- Unused method: UserCache::register_private_chat()
- Getter replaced with direct field access: MessageInfo::edit_date()

## Removed Module:
- error.rs - Unused error handling module (TeletuiError, ErrorVariant, IntoTeletuiError)

## Removed Constants (8):
- EMOJI_PICKER_COLUMNS, EMOJI_PICKER_ROWS, MAX_INPUT_HEIGHT
- MIN_TERMINAL_WIDTH, MIN_TERMINAL_HEIGHT
- TDLIB_CHAT_LIMIT, MAX_USERNAME_DISPLAY_LENGTH, MESSAGE_TEXT_INDENT

## Fixed Warnings:
- Removed unused imports (8 instances)
- Fixed unreachable patterns (10 instances)
- Fixed irrefutable if let patterns (2 instances)
- Fixed unused variables (1 instance)
- Removed dead_code annotations where appropriate

## Improvements:
- Integrated Config::load_credentials() into TdClient::new() for better credential management
- Replaced edit_date() getter with direct field access (message.metadata.edit_date)
- Updated tests to use direct field access instead of removed getters

## Test Results:
All tests passing: 499 passed, 0 failed

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

tests/chat_list.rs

@@ -177,10 +177,10 @@ fn snapshot_chat_with_online_status() {
     // Устанавливаем онлайн-статус для чата напрямую
     let chat_id = ChatId::new(123);
     let user_id = tele_tui::types::UserId::new(123);
-    
+
     // Регистрируем чат как приватный
-    app.td_client.user_cache.register_private_chat(chat_id, user_id);
-    
+    app.td_client.user_cache.chat_user_ids.insert(chat_id, user_id);
+
     // Устанавливаем онлайн-статус
     app.td_client.user_cache.user_statuses.insert(user_id, UserOnlineStatus::Online);
 

tests/e2e_user_journey.rs

@@ -293,7 +293,7 @@ async fn test_user_journey_edit_during_conversation() {
     let edited_history = client.get_chat_history(ChatId::new(555), 50).await.unwrap();
     assert_eq!(edited_history.len(), 1);
     assert_eq!(edited_history[0].text(), "I'll be there at 5pm tomorrow");
-    assert!(edited_history[0].edit_date() > 0, "Должна быть установлена дата редактирования");
+    assert!(edited_history[0].metadata.edit_date > 0, "Должна быть установлена дата редактирования");
 
     // 6. Проверяем историю редактирований
     assert_eq!(client.get_edited_messages().len(), 1);

tests/edit_message.rs

@@ -39,15 +39,15 @@ async fn test_edit_message_sets_edit_date() {
     // Получаем дату до редактирования
     let messages_before = client.get_messages(123);
     let date_before = messages_before[0].date();
-    assert_eq!(messages_before[0].edit_date(), 0); // Не редактировалось
+    assert_eq!(messages_before[0].metadata.edit_date, 0); // Не редактировалось
 
     // Редактируем сообщение
     client.edit_message(ChatId::new(123), msg.id(), "Edited".to_string()).await.unwrap();
 
     // Проверяем что edit_date установлена
     let messages_after = client.get_messages(123);
-    assert!(messages_after[0].edit_date() > 0);
-    assert!(messages_after[0].edit_date() > date_before); // edit_date после date
+    assert!(messages_after[0].metadata.edit_date > 0);
+    assert!(messages_after[0].metadata.edit_date > date_before); // edit_date после date
 }
 
 /// Test: Редактирование только своих сообщений (проверка через can_be_edited)

tests/helpers/fake_tdclient.rs

@@ -2,7 +2,8 @@
 
 use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
-use tele_tui::tdlib::{ChatInfo, FolderInfo, MessageInfo, NetworkState, ProfileInfo, ReplyInfo, ReactionInfo};
+use tele_tui::tdlib::{ChatInfo, MessageInfo, NetworkState, ProfileInfo, ReplyInfo};
+use tele_tui::tdlib::types::{FolderInfo, ReactionInfo};
 use tele_tui::types::{ChatId, MessageId, UserId};
 use tokio::sync::mpsc;
 
@@ -817,7 +818,7 @@ mod tests {
         let edited = client.get_edited_messages();
         assert_eq!(edited.len(), 1);
         assert_eq!(client.get_messages(123)[0].text(), "Hello World");
-        assert!(client.get_messages(123)[0].edit_date() > 0);
+        assert!(client.get_messages(123)[0].metadata.edit_date > 0);
     }
 
     #[tokio::test]

tests/helpers/test_data.rs

@@ -1,6 +1,7 @@
 // Test data builders and fixtures
 
-use tele_tui::tdlib::{ChatInfo, ForwardInfo, MessageInfo, ProfileInfo, ReactionInfo, ReplyInfo};
+use tele_tui::tdlib::{ChatInfo, MessageInfo, ProfileInfo, ReplyInfo};
+use tele_tui::tdlib::types::{ForwardInfo, ReactionInfo};
 use tele_tui::types::{ChatId, MessageId};
 
 /// Builder для создания тестового чата
@@ -176,7 +177,6 @@ impl TestMessageBuilder {
     pub fn forwarded_from(mut self, sender: &str) -> Self {
         self.forward_from = Some(ForwardInfo {
             sender_name: sender.to_string(),
-            date: self.date - 3600,
         });
         self
     }

tests/reply_forward.rs

@@ -4,7 +4,8 @@ mod helpers;
 
 use helpers::fake_tdclient::FakeTdClient;
 use helpers::test_data::TestMessageBuilder;
-use tele_tui::tdlib::{ForwardInfo, ReplyInfo};
+use tele_tui::tdlib::ReplyInfo;
+use tele_tui::tdlib::types::ForwardInfo;
 use tele_tui::types::{ChatId, MessageId};
 
 /// Test: Reply создаёт сообщение с reply_to
@@ -106,7 +107,6 @@ async fn test_forward_creates_message_with_forward_from() {
 
     let forward = messages[0].forward_from().unwrap();
     assert_eq!(forward.sender_name, "Bob");
-    assert!(forward.date > 0); // Дата установлена
 }
 
 /// Test: Forward показывает "↪ Переслано от ..."