refactor: extract header and pinned bar rendering (ui/messages.rs)

Извлечены функции из render() (Phase 5 начало):
- render_chat_header() - заголовок чата с typing status (~50 строк)
- render_pinned_bar() - панель закреплённого сообщения (~30 строк)

Результат:
- Главная функция render() сокращена на ~65 строк
- Применены let-else guards для упрощения
- Каждая функция имеет чёткую ответственность

Phase 5: Рефакторинг ui/messages.rs (879 строк)
Цель: разделить монолитную функцию render() на модули

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

src/ui/messages.rs

@@ -10,6 +10,84 @@ use ratatui::{
     Frame,
 };
 
+/// Рендерит заголовок чата с typing status
+fn render_chat_header<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>, chat: &crate::tdlib::ChatInfo) {
+    let typing_action = app
+        .td_client
+        .typing_status()
+        .as_ref()
+        .map(|(_, action, _)| action.clone());
+
+    let header_line = if let Some(action) = typing_action {
+        // Показываем typing status: "👤 Имя @username печатает..."
+        let mut spans = vec![Span::styled(
+            format!("👤 {}", chat.title),
+            Style::default()
+                .fg(Color::Cyan)
+                .add_modifier(Modifier::BOLD),
+        )];
+        if let Some(username) = &chat.username {
+            spans.push(Span::styled(
+                format!(" {}", username),
+                Style::default().fg(Color::Gray),
+            ));
+        }
+        spans.push(Span::styled(
+            format!(" {}", action),
+            Style::default()
+                .fg(Color::Yellow)
+                .add_modifier(Modifier::ITALIC),
+        ));
+        Line::from(spans)
+    } else {
+        // Показываем username
+        let header_text = match &chat.username {
+            Some(username) => format!("👤 {} {}", chat.title, username),
+            None => format!("👤 {}", chat.title),
+        };
+        Line::from(Span::styled(
+            header_text,
+            Style::default()
+                .fg(Color::Cyan)
+                .add_modifier(Modifier::BOLD),
+        ))
+    };
+
+    let header = Paragraph::new(header_line).block(Block::default().borders(Borders::ALL));
+    f.render_widget(header, area);
+}
+
+/// Рендерит pinned bar с закреплённым сообщением
+fn render_pinned_bar<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>) {
+    let Some(pinned_msg) = app.td_client.current_pinned_message() else {
+        return;
+    };
+
+    let pinned_preview: String = pinned_msg.text().chars().take(40).collect();
+    let ellipsis = if pinned_msg.text().chars().count() > 40 {
+        "..."
+    } else {
+        ""
+    };
+    let pinned_datetime = crate::utils::format_datetime(pinned_msg.date());
+    let pinned_text = format!("📌 {} {}{}", pinned_datetime, pinned_preview, ellipsis);
+    let pinned_hint = "Ctrl+P";
+
+    let pinned_bar_width = area.width as usize;
+    let text_len = pinned_text.chars().count();
+    let hint_len = pinned_hint.chars().count();
+    let padding = pinned_bar_width.saturating_sub(text_len + hint_len + 2);
+
+    let pinned_line = Line::from(vec![
+        Span::styled(pinned_text, Style::default().fg(Color::Magenta)),
+        Span::raw(" ".repeat(padding)),
+        Span::styled(pinned_hint, Style::default().fg(Color::Gray)),
+    ]);
+    let pinned_bar =
+        Paragraph::new(pinned_line).style(Style::default().bg(Color::Rgb(40, 20, 40)));
+    f.render_widget(pinned_bar, area);
+}
+
 fn render_input_with_cursor(
     prefix: &str,
     text: &str,
@@ -173,72 +251,10 @@ pub fn render<T: TdClientTrait>(f: &mut Frame, area: Rect, app: &App<T>) {
         };
 
         // Chat header с typing status
-        let typing_action = app
+        render_chat_header(f, message_chunks[0], app, chat);
-            .td_client
-            .typing_status()
-            .as_ref()
-            .map(|(_, action, _)| action.clone());
-        let header_line = if let Some(action) = typing_action {
-            // Показываем typing status: "👤 Имя @username печатает..."
-            let mut spans = vec![Span::styled(
-                format!("👤 {}", chat.title),
-                Style::default()
-                    .fg(Color::Cyan)
-                    .add_modifier(Modifier::BOLD),
-            )];
-            if let Some(username) = &chat.username {
-                spans
-                    .push(Span::styled(format!(" {}", username), Style::default().fg(Color::Gray)));
-            }
-            spans.push(Span::styled(
-                format!(" {}", action),
-                Style::default()
-                    .fg(Color::Yellow)
-                    .add_modifier(Modifier::ITALIC),
-            ));
-            Line::from(spans)
-        } else {
-            // Показываем username
-            let header_text = match &chat.username {
-                Some(username) => format!("👤 {} {}", chat.title, username),
-                None => format!("👤 {}", chat.title),
-            };
-            Line::from(Span::styled(
-                header_text,
-                Style::default()
-                    .fg(Color::Cyan)
-                    .add_modifier(Modifier::BOLD),
-            ))
-        };
-        let header = Paragraph::new(header_line).block(Block::default().borders(Borders::ALL));
-        f.render_widget(header, message_chunks[0]);
 
         // Pinned bar (если есть закреплённое сообщение)
-        if let Some(pinned_msg) = app.td_client.current_pinned_message() {
+        render_pinned_bar(f, message_chunks[1], app);
-            let pinned_preview: String = pinned_msg.text().chars().take(40).collect();
-            let ellipsis = if pinned_msg.text().chars().count() > 40 {
-                "..."
-            } else {
-                ""
-            };
-            let pinned_datetime = crate::utils::format_datetime(pinned_msg.date());
-            let pinned_text = format!("📌 {} {}{}", pinned_datetime, pinned_preview, ellipsis);
-            let pinned_hint = "Ctrl+P";
-
-            let pinned_bar_width = message_chunks[1].width as usize;
-            let text_len = pinned_text.chars().count();
-            let hint_len = pinned_hint.chars().count();
-            let padding = pinned_bar_width.saturating_sub(text_len + hint_len + 2);
-
-            let pinned_line = Line::from(vec![
-                Span::styled(pinned_text, Style::default().fg(Color::Magenta)),
-                Span::raw(" ".repeat(padding)),
-                Span::styled(pinned_hint, Style::default().fg(Color::Gray)),
-            ]);
-            let pinned_bar =
-                Paragraph::new(pinned_line).style(Style::default().bg(Color::Rgb(40, 20, 40)));
-            f.render_widget(pinned_bar, message_chunks[1]);
-        }
 
         // Ширина области сообщений (без рамок)
         let content_width = message_chunks[2].width.saturating_sub(2) as usize;