Refactor IPC and DTO structures; remove unused code and streamline message handling

- Removed unused structs and methods from `response.rs`, `usage.rs`, and `client.rs`.
- Simplified `Connection` handling in `conn.rs` to only support Unix sockets.
- Updated `IpcServer` to exclusively use Unix sockets and removed TCP handling.
- Cleaned up `editlog.rs` by removing loading and recent entry methods.
- Refactored `memory.rs` to eliminate unused functions related to lesson promotion and retrospective creation.
- Enhanced `search.rs` to support multiple search providers and improved error handling.
- Updated chat view logic to simplify message display and improve user experience.
- Removed deprecated modules and constants from various files to streamline the codebase.

src/view/chat.rs

@@ -38,23 +38,9 @@ pub fn draw_chat(frame: &mut Frame, area: Rect, state: &crate::app::state::rest:
 
     let mut display_lines: Vec<Line> = Vec::new();
 
-    if scroll_offset > 0 {
-        let above = messages.len().saturating_sub(scroll_offset + max_visible).saturating_sub(1);
-        if above > 0 {
-            display_lines.push(Line::from(Span::styled(
-                format!("  ↑ {} more messages above", above),
-                Style::default().fg(Theme::DIM),
-            )));
-        }
-    }
+    let _total_msgs = messages.len();
 
-    let iter_start = if scroll_offset + max_visible >= messages.len() {
-        0usize
-    } else {
-        messages.len().saturating_sub(scroll_offset + max_visible)
-    };
-
-    for msg in messages.iter().skip(iter_start).take(scroll_offset + max_visible) {
+    for msg in messages.iter() {
         let role_color = match msg.role {
             crate::dto::chat::message::Role::User => Theme::ROLE_USER,
             crate::dto::chat::message::Role::Assistant => Theme::ROLE_ASSISTANT,
@@ -98,23 +84,12 @@ pub fn draw_chat(frame: &mut Frame, area: Rect, state: &crate::app::state::rest:
         display_lines.push(Line::from(Span::raw("")));
     }
 
-    if state.turn_in_flight() {
-        let last_is_user = messages.last().map(|m| matches!(m.role, crate::dto::chat::message::Role::User)).unwrap_or(false);
-        if last_is_user {
-            display_lines.push(Line::from(vec![
-                Span::styled(" AI ", Style::default().fg(Theme::BG).bg(Theme::ROLE_ASSISTANT).add_modifier(Modifier::BOLD)),
-                Span::styled(" Thinking...", Style::default().fg(Theme::DIM)),
-            ]));
-            display_lines.push(Line::from(Span::raw("")));
-        }
-    }
-
-    if messages.len() > scroll_offset + max_visible {
-        let below = messages.len().saturating_sub(scroll_offset + max_visible);
-        display_lines.push(Line::from(Span::styled(
-            format!("  ↓ {} more messages below", below),
-            Style::default().fg(Theme::DIM),
-        )));
+    if state.misc.thinking {
+        display_lines.push(Line::from(vec![
+            Span::styled(" AI ", Style::default().fg(Theme::BG).bg(Theme::ROLE_ASSISTANT).add_modifier(Modifier::BOLD)),
+            Span::styled(" Thinking...", Style::default().fg(Theme::DIM)),
+        ]));
+        display_lines.push(Line::from(Span::raw("")));
     }
 
     let mut title = String::from(" Chat ");
@@ -128,13 +103,15 @@ pub fn draw_chat(frame: &mut Frame, area: Rect, state: &crate::app::state::rest:
         .title(title);
 
     let total = display_lines.len();
-    let end_idx = total.saturating_sub(scroll_offset);
+    let max_offset = total.saturating_sub(max_visible);
+    let offset = scroll_offset.min(max_offset);
+
+    let end_idx = total.saturating_sub(offset);
     let start_idx = end_idx.saturating_sub(max_visible);
-    let end_idx = end_idx.min(total);
-    let visible: Vec<Line> = if start_idx < end_idx {
+    let visible: Vec<Line> = if start_idx < end_idx && start_idx < total {
         display_lines[start_idx..end_idx].to_vec()
     } else {
-        Vec::new()
+        display_lines[total.saturating_sub(max_visible)..total].to_vec()
     };
 
     let paragraph = Paragraph::new(visible)

src/view/mod.rs

@@ -1,5 +1,4 @@
 pub mod chat;
-pub mod markdown;
 pub mod status;
 pub mod theme;
 pub mod workflow;

src/view/theme.rs

@@ -4,7 +4,6 @@ pub struct Theme;
 
 impl Theme {
     pub const PRIMARY: Color = Color::Cyan;
-    pub const SECONDARY: Color = Color::Magenta;
     pub const SUCCESS: Color = Color::Green;
     pub const WARNING: Color = Color::Yellow;
     pub const ERROR: Color = Color::Red;