feat(ui): add Markdown rendering to comment text (#1019)

Apply ui.RenderMarkdown() to comment text in both bd show and
bd comments commands. This enables syntax highlighting, code
blocks, and other Markdown formatting in comments.

cmd/bd/comments.go

@@ -9,6 +9,7 @@ import (
 	"github.com/spf13/cobra"
 	"github.com/steveyegge/beads/internal/rpc"
 	"github.com/steveyegge/beads/internal/types"
+	"github.com/steveyegge/beads/internal/ui"
 	"github.com/steveyegge/beads/internal/utils"
 )
 
@@ -94,7 +95,12 @@ Examples:
 
 		fmt.Printf("\nComments on %s:\n\n", issueID)
 		for _, comment := range comments {
-			fmt.Printf("[%s] %s at %s\n", comment.Author, comment.Text, comment.CreatedAt.Format("2006-01-02 15:04"))
+			fmt.Printf("[%s] at %s\n", comment.Author, comment.CreatedAt.Format("2006-01-02 15:04"))
+			rendered := ui.RenderMarkdown(comment.Text)
+			// TrimRight removes trailing newlines that Glamour adds, preventing extra blank lines
+			for _, line := range strings.Split(strings.TrimRight(rendered, "\n"), "\n") {
+				fmt.Printf("  %s\n", line)
+			}
 			fmt.Println()
 		}
 	},