feat(tui): add usage overlay and sidebar for displaying usage statistics and tasks

feat(tui): implement status bar with connection and turn state indicators
feat(tui): create workflow panel for agent status and progress visualization
feat(web): introduce web frontend interface with static file serving
feat(ws): add WebSocket interface for real-time communication and session management

apps/interfaces/tui/src/view/overlays/rewind.rs

@@ -0,0 +1,62 @@
+//! Overlay: Rewind / session history — shows recent messages and lets the user
+//! pick a point to rewind the transcript back to.
+use crate::view::theme::Theme;
+use ratatui::style::{Modifier, Style};
+use ratatui::text::{Line, Span};
+use ratatui::widgets::{Block, Paragraph};
+use ratatui::Frame;
+use zesdex_domain::core::Role;
+
+/// Render the Rewind overlay.
+pub fn render(
+    frame: &mut Frame,
+    area: ratatui::layout::Rect,
+    block: Block<'static>,
+    state: &crate::state::AppStateRest,
+) {
+    let block = block
+        .title(Span::styled(
+            " Rewind ",
+            Style::default()
+                .fg(Theme::ACCENT_ORANGE)
+                .add_modifier(Modifier::BOLD),
+        ))
+        .border_style(Style::default().fg(Theme::ACCENT_ORANGE));
+    let mut lines: Vec<Line> = vec![
+        Line::from(Span::styled(
+            "  Use ↑↓ to navigate, Enter to rewind to that point",
+            Style::default().fg(Theme::TEXT_DIM),
+        )),
+        Line::from(Span::raw("")),
+    ];
+    let messages = &state.transcript_cache.messages;
+    if messages.is_empty() {
+        lines.push(Line::from(Span::styled(
+            "  No messages in current session.",
+            Style::default().fg(Theme::TEXT_DIM),
+        )));
+    } else {
+        let start = if messages.len() > 8 { messages.len() - 8 } else { 0 };
+        for msg in &messages[start..] {
+            let role_str = match msg.role {
+                Role::User => "User",
+                Role::Assistant => "Asst",
+                Role::System => "Sys",
+                Role::Tool => "Tool",
+            };
+            let preview: String = msg.content.chars().take(70).collect();
+            lines.push(Line::from(Span::styled(
+                format!("  [{role_str}] {preview}"),
+                Style::default().fg(if msg.role == Role::User { Theme::INFO } else { Theme::TEXT }),
+            )));
+        }
+        if messages.len() > 8 {
+            lines.push(Line::from(Span::styled(
+                format!("  ... and {} more messages", messages.len() - 8),
+                Style::default().fg(Theme::TEXT_DIM),
+            )));
+        }
+    }
+    let paragraph = Paragraph::new(lines).block(block);
+    frame.render_widget(paragraph, area);
+}