🎨 Palette: Use framed box drawing for playbook banners

.Jules/palette.md

@@ -52,3 +52,7 @@
 ## 2026-07-28 - [Box Drawing for Modern Aesthetics]
 **Learning:** Legacy CLI tools often use ASCII characters (like `*`) for separators, which can feel dated. Replacing them with Unicode box-drawing characters (like `─`) creates a cleaner, more continuous visual flow that matches modern design sensibilities without sacrificing terminal compatibility.
 **Action:** Replace repeated ASCII separator characters with their Unicode box-drawing equivalents (`─`, `━`, `═`) in headers and banners to improve visual polish.
+
+## 2024-05-25 - [Framed Banners for Context Switching]
+**Learning:** Simple horizontal lines often get lost in verbose CLI output. Framing major context switches (like starting a playbook) with a full Unicode box (`┌`, `│`, `└`) creates a strong visual anchor that helps users rapidly identify the beginning of a new execution phase.
+**Action:** Use box-drawing characters to enclose high-level banners, ensuring proper padding calculation (`measure_text_width`) to handle Unicode titles correctly.

src/cli/output.rs

@@ -124,15 +124,31 @@ impl OutputFormatter {
         }
 
         let width = measure_text_width(title);
-        let line = "─".repeat(width + 4);
+        let horizontal = "─".repeat(width + 2);
+
         if self.use_color {
-            println!("\n{}", line.bright_blue());
-            println!("{}", format!("  {}  ", title).bright_blue().bold());
-            println!("{}\n", line.bright_blue());
+            println!(
+                "\n{}{}{}",
+                "┌".bright_blue(),
+                horizontal.bright_blue(),
+                "┐".bright_blue()
+            );
+            println!(
+                "{} {} {}",
+                "│".bright_blue(),
+                title.bright_blue().bold(),
+                "│".bright_blue()
+            );
+            println!(
+                "{}{}{}\n",
+                "└".bright_blue(),
+                horizontal.bright_blue(),
+                "┘".bright_blue()
+            );
         } else {
-            println!("\n{}", line);
-            println!("  {}  ", title);
-            println!("{}\n", line);
+            println!("\n┌{}┐", horizontal);
+            println!("│ {} │", title);
+            println!("└{}┘\n", horizontal);
         }
     }