fix(playback): Improve formatting of code snippets

- Refactor the 'printCodeSnippet' function to draw a complete,
  correctly padded box around the code.
- Each line is now padded with spaces to ensure the right border
  aligns perfectly at the terminal width.

prettyFormat.go

@@ -143,11 +143,23 @@ func printCodeSnippet(snippet *chatpb.CodeSnippet) {
 	language := filepath.Base(snippet.GetFilename()) // Still useful for display
 
 	fmt.Println() // Add extra line feed for spacing
-	fmt.Printf("┌─[ Code Snippet: %s ]──────────────────────────────────\n", language)
+	
+	// --- Top Border ---
+	topBorder := fmt.Sprintf("┌─[ Code Snippet: %s ]", language)
+	fmt.Printf("%s%s┐\n", topBorder, strings.Repeat("─", termWidth-len(topBorder)-1))
+
+	// --- Content Lines ---
 	for _, line := range strings.Split(strings.TrimSpace(code), "\n") {
-		fmt.Printf("│ %s\n", line)
+		// Calculate padding: total width - borders/padding - text length
+		padding := termWidth - 4 - len(line)
+		if padding < 0 {
+			padding = 0 // Should not happen with wrapping, but as a safeguard
+		}
+		fmt.Printf("│ %s%s │\n", line, strings.Repeat(" ", padding))
 	}
-	fmt.Printf("└─────────────────────────────────────────────────────────\n\n")
+
+	// --- Bottom Border ---
+	fmt.Printf("└%s┘\n\n", strings.Repeat("─", termWidth-2))
 }
 
 func printToolCallBox(tc *chatpb.ToolCall) {