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/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();
             }
         }