Implement dynamic status-based title bar with infrastructure health indicator

- Title bar background now dynamically changes based on worst-case status across all hosts
- Green: all OK, Yellow: warnings present, Red: critical issues, Blue: pending, Gray: unknown
- Provides immediate visual feedback of overall infrastructure health
- Added 1-character padding on both sides of title bar
- Maintains dark text for visibility against all status background colors
- Bump version to v0.1.36

Cargo.lock

@@ -270,7 +270,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.34"
+version = "0.1.35"
 dependencies = [
  "anyhow",
  "chrono",
@@ -291,7 +291,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.34"
+version = "0.1.35"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -314,7 +314,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.34"
+version = "0.1.35"
 dependencies = [
  "chrono",
  "serde",

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.35"
+version = "0.1.36"
 edition = "2021"
 
 [dependencies]

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.35"
+version = "0.1.36"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/mod.rs

@@ -537,11 +537,21 @@ impl TuiApp {
         if self.available_hosts.is_empty() {
             let title_text = "cm-dashboard • no hosts discovered";
             let title = Paragraph::new(title_text)
-                .style(Style::default().fg(Theme::background()).bg(Theme::highlight()));
+                .style(Style::default().fg(Theme::background()).bg(Theme::status_color(Status::Unknown)));
             frame.render_widget(title, area);
             return;
         }
 
+        // Calculate worst-case status across all hosts
+        let mut worst_status = Status::Ok;
+        for host in &self.available_hosts {
+            let host_status = self.calculate_host_status(host, metric_store);
+            worst_status = Status::aggregate(&[worst_status, host_status]);
+        }
+
+        // Use the worst status color as background
+        let background_color = Theme::status_color(worst_status);
+
         // Split the title bar into left and right sections
         let chunks = Layout::default()
             .direction(Direction::Horizontal)
@@ -550,11 +560,11 @@ impl TuiApp {
 
         // Left side: "cm-dashboard" text
         let left_span = Span::styled(
-            "cm-dashboard", 
-            Style::default().fg(Theme::background()).bg(Theme::highlight())
+            " cm-dashboard", 
+            Style::default().fg(Theme::background()).bg(background_color)
         );
         let left_title = Paragraph::new(Line::from(vec![left_span]))
-            .style(Style::default().bg(Theme::highlight()));
+            .style(Style::default().bg(background_color));
         frame.render_widget(left_title, chunks[0]);
 
         // Right side: hosts with status indicators
@@ -564,7 +574,7 @@ impl TuiApp {
             if i > 0 {
                 host_spans.push(Span::styled(
                     " ", 
-                    Style::default().fg(Theme::background()).bg(Theme::highlight())
+                    Style::default().fg(Theme::background()).bg(background_color)
                 ));
             }
 
@@ -572,33 +582,39 @@ impl TuiApp {
             let host_status = self.calculate_host_status(host, metric_store);
             let status_icon = StatusIcons::get_icon(host_status);
 
-            // Add status icon with background color as foreground against blue background
+            // Add status icon with background color as foreground against status background
             host_spans.push(Span::styled(
                 format!("{} ", status_icon),
-                Style::default().fg(Theme::background()).bg(Theme::highlight()),
+                Style::default().fg(Theme::background()).bg(background_color),
             ));
 
             if Some(host) == self.current_host.as_ref() {
-                // Selected host in bold background color against blue background
+                // Selected host in bold background color against status background
                 host_spans.push(Span::styled(
                     host.clone(),
                     Style::default()
                         .fg(Theme::background())
-                        .bg(Theme::highlight())
+                        .bg(background_color)
                         .add_modifier(Modifier::BOLD),
                 ));
             } else {
-                // Other hosts in normal background color against blue background
+                // Other hosts in normal background color against status background
                 host_spans.push(Span::styled(
                     host.clone(),
-                    Style::default().fg(Theme::background()).bg(Theme::highlight()),
+                    Style::default().fg(Theme::background()).bg(background_color),
                 ));
             }
         }
 
+        // Add right padding
+        host_spans.push(Span::styled(
+            " ", 
+            Style::default().fg(Theme::background()).bg(background_color)
+        ));
+
         let host_line = Line::from(host_spans);
         let host_title = Paragraph::new(vec![host_line])
-            .style(Style::default().bg(Theme::highlight()))
+            .style(Style::default().bg(background_color))
             .alignment(ratatui::layout::Alignment::Right);
         frame.render_widget(host_title, chunks[1]);
     }

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-shared"
-version = "0.1.35"
+version = "0.1.36"
 edition = "2021"
 
 [dependencies]