refactor: extract state modules and services from monolithic files

Извлечены state модули и сервисы из монолитных файлов для улучшения структуры:

State модули:
- auth_state.rs: состояние авторизации
- chat_list_state.rs: состояние списка чатов
- compose_state.rs: состояние ввода сообщений
- message_view_state.rs: состояние просмотра сообщений
- ui_state.rs: UI состояние

Сервисы и утилиты:
- chat_filter.rs: централизованная фильтрация чатов (470+ строк)
- message_service.rs: сервис работы с сообщениями (17KB)
- key_handler.rs: trait для обработки клавиш (380+ строк)

Config модуль:
- config.rs -> config/mod.rs: основной конфиг
- config/keybindings.rs: настраиваемые горячие клавиши (420+ строк)

Тесты: 626 passed ✅

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

src/config/keybindings.rs

@@ -0,0 +1,472 @@
+/// Модуль для настраиваемых горячих клавиш
+///
+/// Поддерживает:
+/// - Загрузку из конфигурационного файла
+/// - Множественные binding для одной команды (EN/RU раскладки)
+/// - Type-safe команды через enum
+
+use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+/// Команды приложения
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum Command {
+    // Navigation
+    MoveUp,
+    MoveDown,
+    MoveLeft,
+    MoveRight,
+    PageUp,
+    PageDown,
+
+    // Global
+    Quit,
+    OpenSearch,
+    OpenSearchInChat,
+    Help,
+
+    // Chat list
+    OpenChat,
+    SelectFolder1,
+    SelectFolder2,
+    SelectFolder3,
+    SelectFolder4,
+    SelectFolder5,
+    SelectFolder6,
+    SelectFolder7,
+    SelectFolder8,
+    SelectFolder9,
+
+    // Message actions
+    EditMessage,
+    DeleteMessage,
+    ReplyMessage,
+    ForwardMessage,
+    CopyMessage,
+    ReactMessage,
+    SelectMessage,
+
+    // Input
+    SubmitMessage,
+    Cancel,
+    NewLine,
+    DeleteChar,
+    DeleteWord,
+    MoveToStart,
+    MoveToEnd,
+
+    // Profile
+    OpenProfile,
+}
+
+/// Привязка клавиши к команде
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct KeyBinding {
+    #[serde(with = "key_code_serde")]
+    pub key: KeyCode,
+    #[serde(with = "key_modifiers_serde")]
+    pub modifiers: KeyModifiers,
+}
+
+impl KeyBinding {
+    pub fn new(key: KeyCode) -> Self {
+        Self {
+            key,
+            modifiers: KeyModifiers::NONE,
+        }
+    }
+
+    pub fn with_ctrl(key: KeyCode) -> Self {
+        Self {
+            key,
+            modifiers: KeyModifiers::CONTROL,
+        }
+    }
+
+    pub fn with_shift(key: KeyCode) -> Self {
+        Self {
+            key,
+            modifiers: KeyModifiers::SHIFT,
+        }
+    }
+
+    pub fn from_event(event: KeyEvent) -> Self {
+        Self {
+            key: event.code,
+            modifiers: event.modifiers,
+        }
+    }
+
+    pub fn matches(&self, event: &KeyEvent) -> bool {
+        self.key == event.code && self.modifiers == event.modifiers
+    }
+}
+
+/// Конфигурация горячих клавиш
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Keybindings {
+    #[serde(flatten)]
+    bindings: HashMap<Command, Vec<KeyBinding>>,
+}
+
+impl Keybindings {
+    /// Создаёт дефолтную конфигурацию
+    pub fn default() -> Self {
+        let mut bindings = HashMap::new();
+
+        // Navigation
+        bindings.insert(Command::MoveUp, vec![
+            KeyBinding::new(KeyCode::Up),
+            KeyBinding::new(KeyCode::Char('k')),
+            KeyBinding::new(KeyCode::Char('р')), // RU (custom mapping, not standard ЙЦУКЕН)
+        ]);
+        bindings.insert(Command::MoveDown, vec![
+            KeyBinding::new(KeyCode::Down),
+            KeyBinding::new(KeyCode::Char('j')),
+            KeyBinding::new(KeyCode::Char('о')), // RU
+        ]);
+        bindings.insert(Command::MoveLeft, vec![
+            KeyBinding::new(KeyCode::Left),
+            KeyBinding::new(KeyCode::Char('h')),
+            KeyBinding::new(KeyCode::Char('л')), // RU (custom mapping, not standard ЙЦУКЕН)
+        ]);
+        bindings.insert(Command::MoveRight, vec![
+            KeyBinding::new(KeyCode::Right),
+            KeyBinding::new(KeyCode::Char('l')),
+            KeyBinding::new(KeyCode::Char('д')), // RU
+        ]);
+        bindings.insert(Command::PageUp, vec![
+            KeyBinding::new(KeyCode::PageUp),
+            KeyBinding::with_ctrl(KeyCode::Char('u')),
+        ]);
+        bindings.insert(Command::PageDown, vec![
+            KeyBinding::new(KeyCode::PageDown),
+            KeyBinding::with_ctrl(KeyCode::Char('d')),
+        ]);
+
+        // Global
+        bindings.insert(Command::Quit, vec![
+            KeyBinding::new(KeyCode::Char('q')),
+            KeyBinding::new(KeyCode::Char('й')), // RU
+            KeyBinding::with_ctrl(KeyCode::Char('c')),
+        ]);
+        bindings.insert(Command::OpenSearch, vec![
+            KeyBinding::with_ctrl(KeyCode::Char('s')),
+        ]);
+        bindings.insert(Command::OpenSearchInChat, vec![
+            KeyBinding::with_ctrl(KeyCode::Char('f')),
+        ]);
+        bindings.insert(Command::Help, vec![
+            KeyBinding::new(KeyCode::Char('?')),
+        ]);
+
+        // Chat list
+        bindings.insert(Command::OpenChat, vec![
+            KeyBinding::new(KeyCode::Enter),
+        ]);
+        for i in 1..=9 {
+            let cmd = match i {
+                1 => Command::SelectFolder1,
+                2 => Command::SelectFolder2,
+                3 => Command::SelectFolder3,
+                4 => Command::SelectFolder4,
+                5 => Command::SelectFolder5,
+                6 => Command::SelectFolder6,
+                7 => Command::SelectFolder7,
+                8 => Command::SelectFolder8,
+                9 => Command::SelectFolder9,
+                _ => unreachable!(),
+            };
+            bindings.insert(cmd, vec![
+                KeyBinding::new(KeyCode::Char(char::from_digit(i, 10).unwrap())),
+            ]);
+        }
+
+        // Message actions
+        bindings.insert(Command::EditMessage, vec![
+            KeyBinding::new(KeyCode::Up),
+        ]);
+        bindings.insert(Command::DeleteMessage, vec![
+            KeyBinding::new(KeyCode::Delete),
+            KeyBinding::new(KeyCode::Char('d')),
+            KeyBinding::new(KeyCode::Char('в')), // RU
+        ]);
+        bindings.insert(Command::ReplyMessage, vec![
+            KeyBinding::new(KeyCode::Char('r')),
+            KeyBinding::new(KeyCode::Char('к')), // RU
+        ]);
+        bindings.insert(Command::ForwardMessage, vec![
+            KeyBinding::new(KeyCode::Char('f')),
+            KeyBinding::new(KeyCode::Char('а')), // RU
+        ]);
+        bindings.insert(Command::CopyMessage, vec![
+            KeyBinding::new(KeyCode::Char('y')),
+            KeyBinding::new(KeyCode::Char('н')), // RU
+        ]);
+        bindings.insert(Command::ReactMessage, vec![
+            KeyBinding::new(KeyCode::Char('e')),
+            KeyBinding::new(KeyCode::Char('у')), // RU
+        ]);
+        bindings.insert(Command::SelectMessage, vec![
+            KeyBinding::new(KeyCode::Enter),
+        ]);
+
+        // Input
+        bindings.insert(Command::SubmitMessage, vec![
+            KeyBinding::new(KeyCode::Enter),
+        ]);
+        bindings.insert(Command::Cancel, vec![
+            KeyBinding::new(KeyCode::Esc),
+        ]);
+        bindings.insert(Command::NewLine, vec![
+            KeyBinding::with_shift(KeyCode::Enter),
+        ]);
+        bindings.insert(Command::DeleteChar, vec![
+            KeyBinding::new(KeyCode::Backspace),
+        ]);
+        bindings.insert(Command::DeleteWord, vec![
+            KeyBinding::with_ctrl(KeyCode::Backspace),
+            KeyBinding::with_ctrl(KeyCode::Char('w')),
+        ]);
+        bindings.insert(Command::MoveToStart, vec![
+            KeyBinding::new(KeyCode::Home),
+            KeyBinding::with_ctrl(KeyCode::Char('a')),
+        ]);
+        bindings.insert(Command::MoveToEnd, vec![
+            KeyBinding::new(KeyCode::End),
+            KeyBinding::with_ctrl(KeyCode::Char('e')),
+        ]);
+
+        // Profile
+        bindings.insert(Command::OpenProfile, vec![
+            KeyBinding::new(KeyCode::Char('i')),
+            KeyBinding::new(KeyCode::Char('ш')), // RU
+        ]);
+
+        Self { bindings }
+    }
+
+    /// Ищет команду по клавише
+    pub fn get_command(&self, event: &KeyEvent) -> Option<Command> {
+        for (command, bindings) in &self.bindings {
+            if bindings.iter().any(|binding| binding.matches(event)) {
+                return Some(*command);
+            }
+        }
+        None
+    }
+
+    /// Проверяет соответствует ли событие команде
+    pub fn matches(&self, event: &KeyEvent, command: Command) -> bool {
+        self.bindings
+            .get(&command)
+            .map(|bindings| bindings.iter().any(|binding| binding.matches(event)))
+            .unwrap_or(false)
+    }
+
+    /// Возвращает все привязки для команды
+    pub fn get_bindings(&self, command: Command) -> Option<&[KeyBinding]> {
+        self.bindings.get(&command).map(|v| v.as_slice())
+    }
+
+    /// Добавляет новую привязку для команды
+    pub fn add_binding(&mut self, command: Command, binding: KeyBinding) {
+        self.bindings
+            .entry(command)
+            .or_insert_with(Vec::new)
+            .push(binding);
+    }
+
+    /// Удаляет все привязки для команды
+    pub fn remove_command(&mut self, command: Command) {
+        self.bindings.remove(&command);
+    }
+}
+
+impl Default for Keybindings {
+    fn default() -> Self {
+        Self::default()
+    }
+}
+
+/// Сериализация KeyModifiers
+mod key_modifiers_serde {
+    use crossterm::event::KeyModifiers;
+    use serde::{Deserialize, Deserializer, Serializer};
+
+    pub fn serialize<S>(modifiers: &KeyModifiers, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut parts = Vec::new();
+        if modifiers.contains(KeyModifiers::SHIFT) {
+            parts.push("Shift");
+        }
+        if modifiers.contains(KeyModifiers::CONTROL) {
+            parts.push("Ctrl");
+        }
+        if modifiers.contains(KeyModifiers::ALT) {
+            parts.push("Alt");
+        }
+        if modifiers.contains(KeyModifiers::SUPER) {
+            parts.push("Super");
+        }
+        if modifiers.contains(KeyModifiers::HYPER) {
+            parts.push("Hyper");
+        }
+        if modifiers.contains(KeyModifiers::META) {
+            parts.push("Meta");
+        }
+
+        if parts.is_empty() {
+            serializer.serialize_str("None")
+        } else {
+            serializer.serialize_str(&parts.join("+"))
+        }
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<KeyModifiers, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+
+        if s == "None" || s.is_empty() {
+            return Ok(KeyModifiers::NONE);
+        }
+
+        let mut modifiers = KeyModifiers::NONE;
+        for part in s.split('+') {
+            match part.trim() {
+                "Shift" => modifiers |= KeyModifiers::SHIFT,
+                "Ctrl" | "Control" => modifiers |= KeyModifiers::CONTROL,
+                "Alt" => modifiers |= KeyModifiers::ALT,
+                "Super" => modifiers |= KeyModifiers::SUPER,
+                "Hyper" => modifiers |= KeyModifiers::HYPER,
+                "Meta" => modifiers |= KeyModifiers::META,
+                _ => return Err(serde::de::Error::custom(format!("Unknown modifier: {}", part))),
+            }
+        }
+
+        Ok(modifiers)
+    }
+}
+
+/// Сериализация KeyCode
+mod key_code_serde {
+    use crossterm::event::KeyCode;
+    use serde::{Deserialize, Deserializer, Serializer};
+
+    pub fn serialize<S>(key: &KeyCode, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let s = match key {
+            KeyCode::Char(c) => format!("Char('{}')", c),
+            KeyCode::F(n) => format!("F{}", n),
+            KeyCode::Backspace => "Backspace".to_string(),
+            KeyCode::Enter => "Enter".to_string(),
+            KeyCode::Left => "Left".to_string(),
+            KeyCode::Right => "Right".to_string(),
+            KeyCode::Up => "Up".to_string(),
+            KeyCode::Down => "Down".to_string(),
+            KeyCode::Home => "Home".to_string(),
+            KeyCode::End => "End".to_string(),
+            KeyCode::PageUp => "PageUp".to_string(),
+            KeyCode::PageDown => "PageDown".to_string(),
+            KeyCode::Tab => "Tab".to_string(),
+            KeyCode::BackTab => "BackTab".to_string(),
+            KeyCode::Delete => "Delete".to_string(),
+            KeyCode::Insert => "Insert".to_string(),
+            KeyCode::Esc => "Esc".to_string(),
+            _ => "Unknown".to_string(),
+        };
+        serializer.serialize_str(&s)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<KeyCode, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+
+        if s.starts_with("Char('") && s.ends_with("')") {
+            let c = s.chars().nth(6).ok_or_else(|| {
+                serde::de::Error::custom("Invalid Char format")
+            })?;
+            return Ok(KeyCode::Char(c));
+        }
+
+        if s.starts_with("F") {
+            let n = s[1..].parse().map_err(serde::de::Error::custom)?;
+            return Ok(KeyCode::F(n));
+        }
+
+        match s.as_str() {
+            "Backspace" => Ok(KeyCode::Backspace),
+            "Enter" => Ok(KeyCode::Enter),
+            "Left" => Ok(KeyCode::Left),
+            "Right" => Ok(KeyCode::Right),
+            "Up" => Ok(KeyCode::Up),
+            "Down" => Ok(KeyCode::Down),
+            "Home" => Ok(KeyCode::Home),
+            "End" => Ok(KeyCode::End),
+            "PageUp" => Ok(KeyCode::PageUp),
+            "PageDown" => Ok(KeyCode::PageDown),
+            "Tab" => Ok(KeyCode::Tab),
+            "BackTab" => Ok(KeyCode::BackTab),
+            "Delete" => Ok(KeyCode::Delete),
+            "Insert" => Ok(KeyCode::Insert),
+            "Esc" => Ok(KeyCode::Esc),
+            _ => Err(serde::de::Error::custom(format!("Unknown key: {}", s))),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_bindings() {
+        let kb = Keybindings::default();
+
+        // Проверяем навигацию
+        assert!(kb.matches(&KeyEvent::from(KeyCode::Up), Command::MoveUp));
+        assert!(kb.matches(&KeyEvent::from(KeyCode::Char('k')), Command::MoveUp));
+        assert!(kb.matches(&KeyEvent::from(KeyCode::Char('р')), Command::MoveUp));
+    }
+
+    #[test]
+    fn test_get_command() {
+        let kb = Keybindings::default();
+
+        let event = KeyEvent::from(KeyCode::Char('q'));
+        assert_eq!(kb.get_command(&event), Some(Command::Quit));
+
+        let event = KeyEvent::from(KeyCode::Char('й')); // RU
+        assert_eq!(kb.get_command(&event), Some(Command::Quit));
+    }
+
+    #[test]
+    fn test_ctrl_modifier() {
+        let kb = Keybindings::default();
+
+        let mut event = KeyEvent::from(KeyCode::Char('s'));
+        event.modifiers = KeyModifiers::CONTROL;
+
+        assert_eq!(kb.get_command(&event), Some(Command::OpenSearch));
+    }
+
+    #[test]
+    fn test_add_binding() {
+        let mut kb = Keybindings::default();
+
+        kb.add_binding(Command::Quit, KeyBinding::new(KeyCode::Char('x')));
+
+        let event = KeyEvent::from(KeyCode::Char('x'));
+        assert_eq!(kb.get_command(&event), Some(Command::Quit));
+    }
+}

src/config/mod.rs

@@ -0,0 +1,588 @@
+pub mod keybindings;
+
+use crossterm::event::KeyCode;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+
+pub use keybindings::{Command, KeyBinding, Keybindings};
+
+/// Главная конфигурация приложения.
+///
+/// Загружается из `~/.config/tele-tui/config.toml` и содержит настройки
+/// общего поведения, цветовой схемы и горячих клавиш.
+///
+/// # Examples
+///
+/// ```ignore
+/// // Загрузка конфигурации
+/// let config = Config::load();
+///
+/// // Доступ к настройкам
+/// println!("Timezone: {}", config.general.timezone);
+/// println!("Incoming color: {}", config.colors.incoming_message);
+/// ```
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Config {
+    /// Общие настройки (timezone и т.д.).
+    #[serde(default)]
+    pub general: GeneralConfig,
+
+    /// Цветовая схема интерфейса.
+    #[serde(default)]
+    pub colors: ColorsConfig,
+
+    /// Горячие клавиши.
+    #[serde(default)]
+    pub keybindings: Keybindings,
+}
+
+/// Общие настройки приложения.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GeneralConfig {
+    /// Часовой пояс в формате "+03:00" или "-05:00"
+    #[serde(default = "default_timezone")]
+    pub timezone: String,
+}
+
+/// Цветовая схема интерфейса.
+///
+/// Поддерживаемые цвета: red, green, blue, yellow, cyan, magenta,
+/// white, black, gray/grey, а также light-варианты (lightred, lightgreen и т.д.).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ColorsConfig {
+    /// Цвет входящих сообщений (white, gray, cyan и т.д.)
+    #[serde(default = "default_incoming_color")]
+    pub incoming_message: String,
+
+    /// Цвет исходящих сообщений
+    #[serde(default = "default_outgoing_color")]
+    pub outgoing_message: String,
+
+    /// Цвет выбранного сообщения
+    #[serde(default = "default_selected_color")]
+    pub selected_message: String,
+
+    /// Цвет своих реакций
+    #[serde(default = "default_reaction_chosen_color")]
+    pub reaction_chosen: String,
+
+    /// Цвет чужих реакций
+    #[serde(default = "default_reaction_other_color")]
+    pub reaction_other: String,
+}
+
+// Дефолтные значения
+fn default_timezone() -> String {
+    "+03:00".to_string()
+}
+
+fn default_incoming_color() -> String {
+    "white".to_string()
+}
+
+fn default_outgoing_color() -> String {
+    "green".to_string()
+}
+
+fn default_selected_color() -> String {
+    "yellow".to_string()
+}
+
+fn default_reaction_chosen_color() -> String {
+    "yellow".to_string()
+}
+
+fn default_reaction_other_color() -> String {
+    "gray".to_string()
+}
+
+impl Default for GeneralConfig {
+    fn default() -> Self {
+        Self { timezone: default_timezone() }
+    }
+}
+
+impl Default for ColorsConfig {
+    fn default() -> Self {
+        Self {
+            incoming_message: default_incoming_color(),
+            outgoing_message: default_outgoing_color(),
+            selected_message: default_selected_color(),
+            reaction_chosen: default_reaction_chosen_color(),
+            reaction_other: default_reaction_other_color(),
+        }
+    }
+}
+
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            general: GeneralConfig::default(),
+            colors: ColorsConfig::default(),
+            keybindings: Keybindings::default(),
+        }
+    }
+}
+
+impl Config {
+    /// Валидация конфигурации
+    pub fn validate(&self) -> Result<(), String> {
+        // Проверка timezone
+        if !self.general.timezone.starts_with('+') && !self.general.timezone.starts_with('-') {
+            return Err(format!(
+                "Invalid timezone (must start with + or -): {}",
+                self.general.timezone
+            ));
+        }
+
+        // Проверка цветов
+        let valid_colors = [
+            "black",
+            "red",
+            "green",
+            "yellow",
+            "blue",
+            "magenta",
+            "cyan",
+            "gray",
+            "grey",
+            "white",
+            "darkgray",
+            "darkgrey",
+            "lightred",
+            "lightgreen",
+            "lightyellow",
+            "lightblue",
+            "lightmagenta",
+            "lightcyan",
+        ];
+
+        for color_name in [
+            &self.colors.incoming_message,
+            &self.colors.outgoing_message,
+            &self.colors.selected_message,
+            &self.colors.reaction_chosen,
+            &self.colors.reaction_other,
+        ] {
+            if !valid_colors.contains(&color_name.to_lowercase().as_str()) {
+                return Err(format!("Invalid color: {}", color_name));
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Возвращает путь к конфигурационному файлу.
+    ///
+    /// # Returns
+    ///
+    /// `Some(PathBuf)` - `~/.config/tele-tui/config.toml`
+    /// `None` - Не удалось определить директорию конфигурации
+    pub fn config_path() -> Option<PathBuf> {
+        dirs::config_dir().map(|mut path| {
+            path.push("tele-tui");
+            path.push("config.toml");
+            path
+        })
+    }
+
+    /// Путь к директории конфигурации
+    pub fn config_dir() -> Option<PathBuf> {
+        dirs::config_dir().map(|mut path| {
+            path.push("tele-tui");
+            path
+        })
+    }
+
+    /// Загружает конфигурацию из файла.
+    ///
+    /// Ищет конфиг в `~/.config/tele-tui/config.toml`.
+    /// Если файл не существует, создаёт дефолтный.
+    /// Если файл невалиден, возвращает дефолтные значения.
+    ///
+    /// # Returns
+    ///
+    /// Всегда возвращает валидную конфигурацию.
+    ///
+    /// # Examples
+    ///
+    /// ```ignore
+    /// let config = Config::load();
+    /// ```
+    pub fn load() -> Self {
+        let config_path = match Self::config_path() {
+            Some(path) => path,
+            None => {
+                tracing::warn!("Could not determine config directory, using defaults");
+                return Self::default();
+            }
+        };
+
+        if !config_path.exists() {
+            // Создаём дефолтный конфиг при первом запуске
+            let default_config = Self::default();
+            if let Err(e) = default_config.save() {
+                tracing::warn!("Could not create default config: {}", e);
+            }
+            return default_config;
+        }
+
+        match fs::read_to_string(&config_path) {
+            Ok(content) => match toml::from_str::<Config>(&content) {
+                Ok(config) => {
+                    // Валидируем загруженный конфиг
+                    if let Err(e) = config.validate() {
+                        tracing::error!("Config validation error: {}", e);
+                        tracing::warn!("Using default configuration instead");
+                        Self::default()
+                    } else {
+                        config
+                    }
+                }
+                Err(e) => {
+                    tracing::warn!("Could not parse config file: {}", e);
+                    Self::default()
+                }
+            },
+            Err(e) => {
+                tracing::warn!("Could not read config file: {}", e);
+                Self::default()
+            }
+        }
+    }
+
+    /// Сохраняет конфигурацию в файл.
+    ///
+    /// Создаёт директорию `~/.config/tele-tui/` если её нет.
+    ///
+    /// # Returns
+    ///
+    /// * `Ok(())` - Конфиг сохранен
+    /// * `Err(String)` - Ошибка сохранения
+    pub fn save(&self) -> Result<(), String> {
+        let config_dir =
+            Self::config_dir().ok_or_else(|| "Could not determine config directory".to_string())?;
+
+        // Создаём директорию если её нет
+        fs::create_dir_all(&config_dir)
+            .map_err(|e| format!("Could not create config directory: {}", e))?;
+
+        let config_path = config_dir.join("config.toml");
+
+        let toml_string = toml::to_string_pretty(self)
+            .map_err(|e| format!("Could not serialize config: {}", e))?;
+
+        fs::write(&config_path, toml_string)
+            .map_err(|e| format!("Could not write config file: {}", e))?;
+
+        Ok(())
+    }
+
+    /// Парсит строку цвета в `ratatui::style::Color`.
+    ///
+    /// Поддерживает стандартные цвета (red, green, blue и т.д.),
+    /// light-варианты (lightred, lightgreen и т.д.) и grey/gray.
+    ///
+    /// # Arguments
+    ///
+    /// * `color_str` - Название цвета (case-insensitive)
+    ///
+    /// # Returns
+    ///
+    /// `Color` - Соответствующий цвет или `White` если цвет не распознан
+    ///
+    /// # Examples
+    ///
+    /// ```ignore
+    /// let color = config.parse_color("red");
+    /// let color = config.parse_color("LightBlue");
+    /// ```
+    pub fn parse_color(&self, color_str: &str) -> ratatui::style::Color {
+        use ratatui::style::Color;
+
+        match color_str.to_lowercase().as_str() {
+            "black" => Color::Black,
+            "red" => Color::Red,
+            "green" => Color::Green,
+            "yellow" => Color::Yellow,
+            "blue" => Color::Blue,
+            "magenta" => Color::Magenta,
+            "cyan" => Color::Cyan,
+            "gray" | "grey" => Color::Gray,
+            "white" => Color::White,
+            "darkgray" | "darkgrey" => Color::DarkGray,
+            "lightred" => Color::LightRed,
+            "lightgreen" => Color::LightGreen,
+            "lightyellow" => Color::LightYellow,
+            "lightblue" => Color::LightBlue,
+            "lightmagenta" => Color::LightMagenta,
+            "lightcyan" => Color::LightCyan,
+            _ => Color::White, // fallback
+        }
+    }
+
+    /// Путь к файлу credentials
+    pub fn credentials_path() -> Option<PathBuf> {
+        Self::config_dir().map(|dir| dir.join("credentials"))
+    }
+
+    /// Загружает API_ID и API_HASH для Telegram.
+    ///
+    /// Ищет credentials в следующем порядке:
+    /// 1. `~/.config/tele-tui/credentials` файл
+    /// 2. Переменные окружения `API_ID` и `API_HASH`
+    ///
+    /// # Returns
+    ///
+    /// * `Ok((api_id, api_hash))` - Учетные данные найдены
+    /// * `Err(String)` - Ошибка с инструкциями по настройке
+    ///
+    /// # Credentials Format
+    ///
+    /// Файл `~/.config/tele-tui/credentials`:
+    /// ```text
+    /// API_ID=12345
+    /// API_HASH=your_api_hash_here
+    /// ```
+    pub fn load_credentials() -> Result<(i32, String), String> {
+        use std::env;
+
+        // 1. Пробуем загрузить из ~/.config/tele-tui/credentials
+        if let Some(credentials) = Self::load_credentials_from_file() {
+            return Ok(credentials);
+        }
+
+        // 2. Пробуем загрузить из переменных окружения (.env)
+        if let Some(credentials) = Self::load_credentials_from_env() {
+            return Ok(credentials);
+        }
+
+        // 3. Не нашли credentials - возвращаем инструкции
+        let credentials_path = Self::credentials_path()
+            .map(|p| p.display().to_string())
+            .unwrap_or_else(|| "~/.config/tele-tui/credentials".to_string());
+
+        Err(format!(
+            "Telegram API credentials not found!\n\n\
+            Please create a file at:\n  {}\n\n\
+            With the following content:\n\
+            API_ID=your_api_id\n\
+            API_HASH=your_api_hash\n\n\
+            You can get API credentials at: https://my.telegram.org/apps\n\n\
+            Alternatively, you can create a .env file in the current directory.",
+            credentials_path
+        ))
+    }
+
+    /// Загружает credentials из файла ~/.config/tele-tui/credentials
+    fn load_credentials_from_file() -> Option<(i32, String)> {
+        let cred_path = Self::credentials_path()?;
+
+        if !cred_path.exists() {
+            return None;
+        }
+
+        let content = fs::read_to_string(&cred_path).ok()?;
+        let mut api_id: Option<i32> = None;
+        let mut api_hash: Option<String> = None;
+
+        for line in content.lines() {
+            let line = line.trim();
+            if line.is_empty() || line.starts_with('#') {
+                continue;
+            }
+
+            let (key, value) = line.split_once('=')?;
+            let key = key.trim();
+            let value = value.trim();
+
+            match key {
+                "API_ID" => api_id = value.parse().ok(),
+                "API_HASH" => api_hash = Some(value.to_string()),
+                _ => {}
+            }
+        }
+
+        Some((api_id?, api_hash?))
+    }
+
+    /// Загружает credentials из переменных окружения (.env)
+    fn load_credentials_from_env() -> Option<(i32, String)> {
+        use std::env;
+
+        let api_id_str = env::var("API_ID").ok()?;
+        let api_hash = env::var("API_HASH").ok()?;
+        let api_id = api_id_str.parse::<i32>().ok()?;
+
+        Some((api_id, api_hash))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crossterm::event::{KeyEvent, KeyModifiers};
+
+    #[test]
+    fn test_config_default_includes_keybindings() {
+        let config = Config::default();
+        let keybindings = &config.keybindings;
+
+        // Test that keybindings exist for common commands
+        assert!(keybindings.get_command(&KeyEvent::new(KeyCode::Char('r'), KeyModifiers::NONE)) == Some(Command::ReplyMessage));
+        assert!(keybindings.get_command(&KeyEvent::new(KeyCode::Char('к'), KeyModifiers::NONE)) == Some(Command::ReplyMessage));
+        assert!(keybindings.get_command(&KeyEvent::new(KeyCode::Char('f'), KeyModifiers::NONE)) == Some(Command::ForwardMessage));
+        assert!(keybindings.get_command(&KeyEvent::new(KeyCode::Char('а'), KeyModifiers::NONE)) == Some(Command::ForwardMessage));
+    }
+
+    #[test]
+    fn test_config_validate_valid() {
+        let config = Config::default();
+        assert!(config.validate().is_ok());
+    }
+
+    #[test]
+    fn test_config_validate_invalid_timezone_no_sign() {
+        let mut config = Config::default();
+        config.general.timezone = "03:00".to_string();
+
+        let result = config.validate();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("timezone"));
+    }
+
+    #[test]
+    fn test_config_validate_valid_negative_timezone() {
+        let mut config = Config::default();
+        config.general.timezone = "-05:00".to_string();
+
+        assert!(config.validate().is_ok());
+    }
+
+    #[test]
+    fn test_config_validate_valid_positive_timezone() {
+        let mut config = Config::default();
+        config.general.timezone = "+09:00".to_string();
+
+        assert!(config.validate().is_ok());
+    }
+
+    #[test]
+    fn test_config_validate_invalid_color_incoming() {
+        let mut config = Config::default();
+        config.colors.incoming_message = "rainbow".to_string();
+
+        let result = config.validate();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("Invalid color"));
+    }
+
+    #[test]
+    fn test_config_validate_invalid_color_outgoing() {
+        let mut config = Config::default();
+        config.colors.outgoing_message = "purple".to_string();
+
+        let result = config.validate();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("Invalid color"));
+    }
+
+    #[test]
+    fn test_config_validate_invalid_color_selected() {
+        let mut config = Config::default();
+        config.colors.selected_message = "pink".to_string();
+
+        let result = config.validate();
+        assert!(result.is_err());
+        assert!(result.unwrap_err().contains("Invalid color"));
+    }
+
+    #[test]
+    fn test_config_validate_valid_all_standard_colors() {
+        let colors = [
+            "black", "red", "green", "yellow", "blue", "magenta",
+            "cyan", "gray", "grey", "white", "darkgray", "darkgrey",
+            "lightred", "lightgreen", "lightyellow", "lightblue",
+            "lightmagenta", "lightcyan"
+        ];
+
+        for color in colors {
+            let mut config = Config::default();
+            config.colors.incoming_message = color.to_string();
+            config.colors.outgoing_message = color.to_string();
+            config.colors.selected_message = color.to_string();
+            config.colors.reaction_chosen = color.to_string();
+            config.colors.reaction_other = color.to_string();
+
+            assert!(
+                config.validate().is_ok(),
+                "Color '{}' should be valid",
+                color
+            );
+        }
+    }
+
+    #[test]
+    fn test_config_validate_case_insensitive_colors() {
+        let mut config = Config::default();
+        config.colors.incoming_message = "RED".to_string();
+        config.colors.outgoing_message = "Green".to_string();
+        config.colors.selected_message = "YELLOW".to_string();
+
+        assert!(config.validate().is_ok());
+    }
+
+    #[test]
+    fn test_parse_color_standard() {
+        let config = Config::default();
+
+        use ratatui::style::Color;
+        assert_eq!(config.parse_color("red"), Color::Red);
+        assert_eq!(config.parse_color("green"), Color::Green);
+        assert_eq!(config.parse_color("blue"), Color::Blue);
+    }
+
+    #[test]
+    fn test_parse_color_light_variants() {
+        let config = Config::default();
+
+        use ratatui::style::Color;
+        assert_eq!(config.parse_color("lightred"), Color::LightRed);
+        assert_eq!(config.parse_color("lightgreen"), Color::LightGreen);
+        assert_eq!(config.parse_color("lightblue"), Color::LightBlue);
+    }
+
+    #[test]
+    fn test_parse_color_gray_variants() {
+        let config = Config::default();
+
+        use ratatui::style::Color;
+        assert_eq!(config.parse_color("gray"), Color::Gray);
+        assert_eq!(config.parse_color("grey"), Color::Gray);
+        assert_eq!(config.parse_color("darkgray"), Color::DarkGray);
+        assert_eq!(config.parse_color("darkgrey"), Color::DarkGray);
+    }
+
+    #[test]
+    fn test_parse_color_case_insensitive() {
+        let config = Config::default();
+
+        use ratatui::style::Color;
+        assert_eq!(config.parse_color("RED"), Color::Red);
+        assert_eq!(config.parse_color("Green"), Color::Green);
+        assert_eq!(config.parse_color("LIGHTBLUE"), Color::LightBlue);
+    }
+
+    #[test]
+    fn test_parse_color_invalid_fallback() {
+        let config = Config::default();
+
+        use ratatui::style::Color;
+        // Invalid colors should fallback to White
+        assert_eq!(config.parse_color("rainbow"), Color::White);
+        assert_eq!(config.parse_color("purple"), Color::White);
+        assert_eq!(config.parse_color("unknown"), Color::White);
+    }
+}