feat(tui): add update banner UI component in MinimalSessionView

Author: echobt

src/cortex-tui/src/app/mod.rs

@@ -15,7 +15,7 @@ mod types;
 pub use approval::{ApprovalState, PendingToolResult};
 pub use autocomplete::{AutocompleteItem, AutocompleteState};
 pub use session::{ActiveModal, SessionSummary};
-pub use state::AppState;
+pub use state::{AppState, UpdateStatus};
 pub use streaming::StreamingState;
 pub use subagent::{
     SubagentDisplayStatus, SubagentTaskDisplay, SubagentTodoItem, SubagentTodoStatus,

src/cortex-tui/src/views/minimal_session/rendering.rs

@@ -960,3 +960,65 @@ pub fn render_motd_compact(
 
     Paragraph::new(lines).render(text_area, buf);
 }
+
+/// Renders an update notification banner above the input box.
+/// Shows different states: Available, Downloading (with progress), ReadyToRestart
+pub fn render_update_banner(
+    area: Rect,
+    buf: &mut Buffer,
+    colors: &AdaptiveColors,
+    update_status: &crate::app::UpdateStatus,
+) {
+    use crate::app::UpdateStatus;
+
+    if area.is_empty() || area.height < 1 {
+        return;
+    }
+
+    let (icon, text, style) = match update_status {
+        UpdateStatus::Available { version } => {
+            let icon = "↑";
+            let text = format!(" A new version ({}) is available ", version);
+            let style = Style::default()
+                .fg(colors.accent)
+                .add_modifier(Modifier::BOLD);
+            (icon, text, style)
+        }
+        UpdateStatus::Downloading {
+            version: _,
+            progress,
+        } => {
+            let icon = "⟳";
+            let text = format!(" Downloading update... {}% ", progress);
+            let style = Style::default().fg(colors.warning);
+            (icon, text, style)
+        }
+        UpdateStatus::ReadyToRestart { version: _ } => {
+            let icon = "✓";
+            let text = " You must restart to run the latest version ".to_string();
+            let style = Style::default()
+                .fg(colors.success)
+                .add_modifier(Modifier::BOLD);
+            (icon, text, style)
+        }
+        _ => return, // Don't render for other states
+    };
+
+    // Calculate banner width
+    let banner_width = (icon.len() + text.len() + 2) as u16; // +2 for spacing
+
+    // Position at left side of the area with some padding
+    let x = area.x + 2;
+    let y = area.y;
+
+    // Ensure we don't overflow
+    if x + banner_width > area.right() {
+        return;
+    }
+
+    // Render icon
+    buf.set_string(x, y, icon, style);
+
+    // Render text
+    buf.set_string(x + icon.len() as u16 + 1, y, &text, style);
+}

src/cortex-tui/src/views/minimal_session/view.rs

@@ -569,6 +569,8 @@ impl<'a> Widget for MinimalSessionView<'a> {
             self.app_state.autocomplete.visible && self.app_state.autocomplete.has_items();
         let autocomplete_height: u16 = if autocomplete_visible { 10 } else { 0 };
         let status_height: u16 = if is_task_running { 1 } else { 0 };
+        let show_update_banner = self.app_state.should_show_update_banner();
+        let update_banner_height: u16 = if show_update_banner { 1 } else { 0 };
         let input_height: u16 = 3;
         let hints_height: u16 = 1;
 
@@ -584,7 +586,8 @@ impl<'a> Widget for MinimalSessionView<'a> {
         layout.gap(1);
 
         // Calculate available height for scrollable content (before input/hints)
-        let bottom_reserved = status_height + input_height + autocomplete_height + hints_height + 2; // +2 for gaps
+        let bottom_reserved =
+            status_height + update_banner_height + input_height + autocomplete_height + hints_height + 2; // +2 for gaps
         let available_height = area.height.saturating_sub(1 + bottom_reserved); // 1 for top margin
 
         // Render scrollable content area (welcome cards + messages together)
@@ -608,7 +611,19 @@ impl<'a> Widget for MinimalSessionView<'a> {
             next_y += status_height;
         }
 
-        // 6. Input area - follows status (or content if no status)
+        // 5.5 Update banner (if applicable) - above input
+        if show_update_banner {
+            let banner_area = Rect::new(area.x, next_y, area.width, update_banner_height);
+            super::rendering::render_update_banner(
+                banner_area,
+                buf,
+                &self.colors,
+                &self.app_state.update_status,
+            );
+            next_y += update_banner_height;
+        }
+
+        // 6. Input area - follows update banner (or status if no banner)
         let input_y = next_y;
         let input_area = Rect::new(area.x, input_y, area.width, input_height);