refactor: split app/mod.rs into trait-based architecture (1015→371 lines)

Split monolithic App impl into 5 specialized trait modules:
- methods/navigation.rs (NavigationMethods) - 7 methods for chat navigation
- methods/messages.rs (MessageMethods) - 8 methods for message operations
- methods/compose.rs (ComposeMethods) - 10 methods for reply/forward/draft
- methods/search.rs (SearchMethods) - 15 methods for search functionality
- methods/modal.rs (ModalMethods) - 27 methods for modal dialogs

Changes:
- app/mod.rs: 1015→371 lines (removed 644 lines, -63%)
- Created app/methods/ with 5 trait impl blocks
- Left in app/mod.rs: constructors, get_command, get_selected_chat_id/chat, getters/setters
- 116 functions → 5 trait impl blocks (67 in traits + 48 in core)
- Single Responsibility Principle achieved
- Updated CONTEXT.md with refactoring metrics
- Updated ROADMAP.md: Phase 13 Etap 2 marked as DONE

Phase 13 Etap 2: COMPLETED (100%)

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

src/app/methods/modal.rs

@@ -0,0 +1,308 @@
+//! Modal methods for App
+//!
+//! Handles modal dialogs: Profile, Pinned Messages, Reactions, Delete Confirmation
+
+use crate::app::{App, ChatState};
+use crate::tdlib::{MessageInfo, ProfileInfo, TdClientTrait};
+use crate::types::MessageId;
+
+/// Modal dialog methods
+pub trait ModalMethods<T: TdClientTrait> {
+    // === Delete Confirmation ===
+
+    /// Check if delete confirmation modal is shown
+    fn is_confirm_delete_shown(&self) -> bool;
+
+    // === Pinned Messages ===
+
+    /// Check if in pinned messages mode
+    fn is_pinned_mode(&self) -> bool;
+
+    /// Enter pinned messages mode
+    fn enter_pinned_mode(&mut self, messages: Vec<MessageInfo>);
+
+    /// Exit pinned messages mode
+    fn exit_pinned_mode(&mut self);
+
+    /// Select previous pinned message (up = older)
+    fn select_previous_pinned(&mut self);
+
+    /// Select next pinned message (down = newer)
+    fn select_next_pinned(&mut self);
+
+    /// Get currently selected pinned message
+    fn get_selected_pinned(&self) -> Option<&MessageInfo>;
+
+    /// Get ID of selected pinned message for navigation
+    fn get_selected_pinned_id(&self) -> Option<i64>;
+
+    // === Profile ===
+
+    /// Check if in profile mode
+    fn is_profile_mode(&self) -> bool;
+
+    /// Enter profile mode
+    fn enter_profile_mode(&mut self, info: ProfileInfo);
+
+    /// Exit profile mode
+    fn exit_profile_mode(&mut self);
+
+    /// Select previous profile action
+    fn select_previous_profile_action(&mut self);
+
+    /// Select next profile action
+    fn select_next_profile_action(&mut self, max_actions: usize);
+
+    /// Show first leave group confirmation
+    fn show_leave_group_confirmation(&mut self);
+
+    /// Show second leave group confirmation
+    fn show_leave_group_final_confirmation(&mut self);
+
+    /// Cancel leave group confirmation
+    fn cancel_leave_group(&mut self);
+
+    /// Get current leave group confirmation step (0, 1, or 2)
+    fn get_leave_group_confirmation_step(&self) -> u8;
+
+    /// Get profile info
+    fn get_profile_info(&self) -> Option<&ProfileInfo>;
+
+    /// Get selected profile action index
+    fn get_selected_profile_action(&self) -> Option<usize>;
+
+    // === Reactions ===
+
+    /// Check if in reaction picker mode
+    fn is_reaction_picker_mode(&self) -> bool;
+
+    /// Enter reaction picker mode
+    fn enter_reaction_picker_mode(&mut self, message_id: i64, available_reactions: Vec<String>);
+
+    /// Exit reaction picker mode
+    fn exit_reaction_picker_mode(&mut self);
+
+    /// Select previous reaction
+    fn select_previous_reaction(&mut self);
+
+    /// Select next reaction
+    fn select_next_reaction(&mut self);
+
+    /// Get currently selected reaction emoji
+    fn get_selected_reaction(&self) -> Option<&String>;
+
+    /// Get message ID for which reaction is being selected
+    fn get_selected_message_for_reaction(&self) -> Option<i64>;
+}
+
+impl<T: TdClientTrait> ModalMethods<T> for App<T> {
+    fn is_confirm_delete_shown(&self) -> bool {
+        self.chat_state.is_delete_confirmation()
+    }
+
+    fn is_pinned_mode(&self) -> bool {
+        self.chat_state.is_pinned_mode()
+    }
+
+    fn enter_pinned_mode(&mut self, messages: Vec<MessageInfo>) {
+        if !messages.is_empty() {
+            self.chat_state = ChatState::PinnedMessages {
+                messages,
+                selected_index: 0,
+            };
+        }
+    }
+
+    fn exit_pinned_mode(&mut self) {
+        self.chat_state = ChatState::Normal;
+    }
+
+    fn select_previous_pinned(&mut self) {
+        if let ChatState::PinnedMessages {
+            selected_index,
+            messages,
+        } = &mut self.chat_state
+        {
+            if *selected_index + 1 < messages.len() {
+                *selected_index += 1;
+            }
+        }
+    }
+
+    fn select_next_pinned(&mut self) {
+        if let ChatState::PinnedMessages { selected_index, .. } = &mut self.chat_state {
+            if *selected_index > 0 {
+                *selected_index -= 1;
+            }
+        }
+    }
+
+    fn get_selected_pinned(&self) -> Option<&MessageInfo> {
+        if let ChatState::PinnedMessages {
+            messages,
+            selected_index,
+        } = &self.chat_state
+        {
+            messages.get(*selected_index)
+        } else {
+            None
+        }
+    }
+
+    fn get_selected_pinned_id(&self) -> Option<i64> {
+        self.get_selected_pinned().map(|m| m.id().as_i64())
+    }
+
+    fn is_profile_mode(&self) -> bool {
+        self.chat_state.is_profile()
+    }
+
+    fn enter_profile_mode(&mut self, info: ProfileInfo) {
+        self.chat_state = ChatState::Profile {
+            info,
+            selected_action: 0,
+            leave_group_confirmation_step: 0,
+        };
+    }
+
+    fn exit_profile_mode(&mut self) {
+        self.chat_state = ChatState::Normal;
+    }
+
+    fn select_previous_profile_action(&mut self) {
+        if let ChatState::Profile {
+            selected_action, ..
+        } = &mut self.chat_state
+        {
+            if *selected_action > 0 {
+                *selected_action -= 1;
+            }
+        }
+    }
+
+    fn select_next_profile_action(&mut self, max_actions: usize) {
+        if let ChatState::Profile {
+            selected_action, ..
+        } = &mut self.chat_state
+        {
+            if *selected_action < max_actions.saturating_sub(1) {
+                *selected_action += 1;
+            }
+        }
+    }
+
+    fn show_leave_group_confirmation(&mut self) {
+        if let ChatState::Profile {
+            leave_group_confirmation_step,
+            ..
+        } = &mut self.chat_state
+        {
+            *leave_group_confirmation_step = 1;
+        }
+    }
+
+    fn show_leave_group_final_confirmation(&mut self) {
+        if let ChatState::Profile {
+            leave_group_confirmation_step,
+            ..
+        } = &mut self.chat_state
+        {
+            *leave_group_confirmation_step = 2;
+        }
+    }
+
+    fn cancel_leave_group(&mut self) {
+        if let ChatState::Profile {
+            leave_group_confirmation_step,
+            ..
+        } = &mut self.chat_state
+        {
+            *leave_group_confirmation_step = 0;
+        }
+    }
+
+    fn get_leave_group_confirmation_step(&self) -> u8 {
+        if let ChatState::Profile {
+            leave_group_confirmation_step,
+            ..
+        } = &self.chat_state
+        {
+            *leave_group_confirmation_step
+        } else {
+            0
+        }
+    }
+
+    fn get_profile_info(&self) -> Option<&ProfileInfo> {
+        if let ChatState::Profile { info, .. } = &self.chat_state {
+            Some(info)
+        } else {
+            None
+        }
+    }
+
+    fn get_selected_profile_action(&self) -> Option<usize> {
+        if let ChatState::Profile {
+            selected_action, ..
+        } = &self.chat_state
+        {
+            Some(*selected_action)
+        } else {
+            None
+        }
+    }
+
+    fn is_reaction_picker_mode(&self) -> bool {
+        self.chat_state.is_reaction_picker()
+    }
+
+    fn enter_reaction_picker_mode(&mut self, message_id: i64, available_reactions: Vec<String>) {
+        self.chat_state = ChatState::ReactionPicker {
+            message_id: MessageId::new(message_id),
+            available_reactions,
+            selected_index: 0,
+        };
+    }
+
+    fn exit_reaction_picker_mode(&mut self) {
+        self.chat_state = ChatState::Normal;
+    }
+
+    fn select_previous_reaction(&mut self) {
+        if let ChatState::ReactionPicker { selected_index, .. } = &mut self.chat_state {
+            if *selected_index > 0 {
+                *selected_index -= 1;
+            }
+        }
+    }
+
+    fn select_next_reaction(&mut self) {
+        if let ChatState::ReactionPicker {
+            selected_index,
+            available_reactions,
+            ..
+        } = &mut self.chat_state
+        {
+            if *selected_index + 1 < available_reactions.len() {
+                *selected_index += 1;
+            }
+        }
+    }
+
+    fn get_selected_reaction(&self) -> Option<&String> {
+        if let ChatState::ReactionPicker {
+            available_reactions,
+            selected_index,
+            ..
+        } = &self.chat_state
+        {
+            available_reactions.get(*selected_index)
+        } else {
+            None
+        }
+    }
+
+    fn get_selected_message_for_reaction(&self) -> Option<i64> {
+        self.chat_state.selected_message_id().map(|id| id.as_i64())
+    }
+}