refactor: complete Phase 13 deep architecture refactoring (etaps 3-7)

Split monolithic files into modular architecture:
- ui/messages.rs (893→365 lines): extract modals/, compose_bar.rs
- tdlib/messages.rs (836→3 files): split into messages/mod, convert, operations
- config/mod.rs (642→3 files): extract validation.rs, loader.rs
- Code duplication cleanup: shared components, ~220 lines removed
- Documentation: PROJECT_STRUCTURE.md rewrite, 16 files got //! docs

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

src/input/handlers/chat.rs

@@ -7,7 +7,11 @@
 //! - Loading older messages
 
 use crate::app::App;
-use crate::tdlib::{TdClientTrait, ChatAction, ReplyInfo};
+use crate::app::methods::{
+    compose::ComposeMethods, messages::MessageMethods,
+    modal::ModalMethods, navigation::NavigationMethods,
+};
+use crate::tdlib::{TdClientTrait, ChatAction};
 use crate::types::{ChatId, MessageId};
 use crate::utils::{is_non_empty, with_timeout, with_timeout_msg};
 use crate::input::handlers::{copy_to_clipboard, format_message_for_clipboard};

src/input/handlers/chat_list.rs

@@ -6,10 +6,11 @@
 //! - Opening chats
 
 use crate::app::App;
+use crate::app::methods::{compose::ComposeMethods, navigation::NavigationMethods};
 use crate::tdlib::TdClientTrait;
 use crate::types::{ChatId, MessageId};
 use crate::utils::{with_timeout, with_timeout_msg, with_timeout_ignore};
-use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use crossterm::event::KeyEvent;
 use std::time::Duration;
 
 /// Обработка навигации в списке чатов

src/input/handlers/compose.rs

@@ -7,10 +7,13 @@
 //! - Cursor movement and text editing
 
 use crate::app::App;
+use crate::app::methods::{
+    compose::ComposeMethods, navigation::NavigationMethods, search::SearchMethods,
+};
 use crate::tdlib::TdClientTrait;
 use crate::types::ChatId;
 use crate::utils::with_timeout_msg;
-use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use crossterm::event::KeyEvent;
 use std::time::Duration;
 
 /// Обработка режима выбора чата для пересылки сообщения

src/input/handlers/global.rs

@@ -7,6 +7,7 @@
 //! - Ctrl+F: Search messages in chat
 
 use crate::app::App;
+use crate::app::methods::{modal::ModalMethods, search::SearchMethods};
 use crate::tdlib::TdClientTrait;
 use crate::types::ChatId;
 use crate::utils::{with_timeout, with_timeout_msg};

src/input/handlers/mod.rs

@@ -22,3 +22,21 @@ pub mod search;
 pub use clipboard::*;
 pub use global::*;
 pub use profile::get_available_actions_count;
+
+use crate::app::App;
+use crate::tdlib::TdClientTrait;
+use crate::types::MessageId;
+
+/// Скроллит к сообщению по его ID в текущем чате
+pub fn scroll_to_message<T: TdClientTrait>(app: &mut App<T>, message_id: MessageId) {
+    let msg_index = app
+        .td_client
+        .current_chat_messages()
+        .iter()
+        .position(|m| m.id() == message_id);
+
+    if let Some(idx) = msg_index {
+        let total = app.td_client.current_chat_messages().len();
+        app.message_scroll_offset = total.saturating_sub(idx + 5);
+    }
+}

src/input/handlers/modal.rs

@@ -7,11 +7,13 @@
 //! - Profile information modal
 
 use crate::app::App;
+use crate::app::methods::{modal::ModalMethods, navigation::NavigationMethods};
 use crate::tdlib::TdClientTrait;
 use crate::types::{ChatId, MessageId};
 use crate::utils::{with_timeout_msg, modal_handler::handle_yes_no};
 use crate::input::handlers::get_available_actions_count;
-use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use super::scroll_to_message;
+use crossterm::event::KeyEvent;
 use std::time::Duration;
 
 /// Обработка режима профиля пользователя/чата
@@ -295,17 +297,7 @@ pub async fn handle_pinned_mode<T: TdClientTrait>(app: &mut App<T>, _key: KeyEve
         }
         Some(crate::config::Command::SubmitMessage) => {
             if let Some(msg_id) = app.get_selected_pinned_id() {
-                let msg_id = MessageId::new(msg_id);
-                let msg_index = app
-                    .td_client
-                    .current_chat_messages()
-                    .iter()
-                    .position(|m| m.id() == msg_id);
-
-                if let Some(idx) = msg_index {
-                    let total = app.td_client.current_chat_messages().len();
-                    app.message_scroll_offset = total.saturating_sub(idx + 5);
-                }
+                scroll_to_message(app, MessageId::new(msg_id));
                 app.exit_pinned_mode();
             }
         }

src/input/handlers/search.rs

@@ -6,14 +6,15 @@
 //! - Search query input
 
 use crate::app::App;
+use crate::app::methods::{navigation::NavigationMethods, search::SearchMethods};
 use crate::tdlib::TdClientTrait;
 use crate::types::{ChatId, MessageId};
 use crate::utils::with_timeout;
-use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
+use crossterm::event::{KeyCode, KeyEvent};
 use std::time::Duration;
 
-// Import from chat_list module
 use super::chat_list::open_chat_and_load_data;
+use super::scroll_to_message;
 
 /// Обработка режима поиска по чатам
 /// 
@@ -75,17 +76,7 @@ pub async fn handle_message_search_mode<T: TdClientTrait>(app: &mut App<T>, key:
         }
         Some(crate::config::Command::SubmitMessage) => {
             if let Some(msg_id) = app.get_selected_search_result_id() {
-                let msg_id = MessageId::new(msg_id);
-                let msg_index = app
-                    .td_client
-                    .current_chat_messages()
-                    .iter()
-                    .position(|m| m.id() == msg_id);
-
-                if let Some(idx) = msg_index {
-                    let total = app.td_client.current_chat_messages().len();
-                    app.message_scroll_offset = total.saturating_sub(idx + 5);
-                }
+                scroll_to_message(app, MessageId::new(msg_id));
                 app.exit_message_search_mode();
             }
         }

src/input/main_input.rs

@@ -1,32 +1,32 @@
+//! Main screen input router.
+//!
+//! Dispatches keyboard events to specialized handlers based on current app mode.
+//! Priority order: modals → search → compose → chat → chat list.
+
 use crate::app::App;
+use crate::app::methods::{
+    compose::ComposeMethods,
+    messages::MessageMethods,
+    modal::ModalMethods,
+    navigation::NavigationMethods,
+    search::SearchMethods,
+};
 use crate::tdlib::TdClientTrait;
 use crate::input::handlers::{
-    copy_to_clipboard, format_message_for_clipboard, get_available_actions_count,
     handle_global_commands,
     modal::{
         handle_profile_mode, handle_profile_open, handle_delete_confirmation,
         handle_reaction_picker_mode, handle_pinned_mode,
     },
-    search::{
-        handle_chat_search_mode, handle_message_search_mode, perform_message_search,
-    },
-    compose::{
-        handle_forward_mode, forward_selected_message,
-    },
-    chat_list::{
-        handle_chat_list_navigation, select_folder, open_chat_and_load_data,
-    },
+    search::{handle_chat_search_mode, handle_message_search_mode},
+    compose::handle_forward_mode,
+    chat_list::handle_chat_list_navigation,
     chat::{
-        handle_message_selection, handle_enter_key, send_reaction,
-        load_older_messages_if_needed, handle_open_chat_keyboard_input,
+        handle_message_selection, handle_enter_key,
+        handle_open_chat_keyboard_input,
     },
 };
-use crate::tdlib::ChatAction;
-use crate::types::{ChatId, MessageId};
-use crate::utils::{is_non_empty, with_timeout, with_timeout_msg, with_timeout_ignore};
-use crate::utils::modal_handler::handle_yes_no;
-use crossterm::event::{KeyCode, KeyEvent};
-use std::time::{Duration, Instant};
+use crossterm::event::KeyEvent;
 
 
 

src/input/mod.rs

@@ -1,3 +1,7 @@
+//! Input handling module.
+//!
+//! Routes keyboard events by screen (Auth vs Main) to specialized handlers.
+
 mod auth;
 pub mod handlers;
 mod main_input;