fix(banner): fix title frame overflow + center tagline + banner on --help

- Print DROGONSEC title outside boxLine to eliminate double-width
  character misalignment (█ and box-drawing chars render as 2 cols in
  some terminals, causing NSEC to overflow the right ║ border).
  The ╠═══╣ separators above/below visually enclose the title.
- Center the ◆ HUNT VULNERABILITIES ◆ BREAK WALLS ◆ SECURE CODE ◆
  line using centerIn() helper (pads to mid-point of inner frame width).
- Show banner on drogonsec --help / drogonsec -h and all subcommand
  help (drogonsec scan --help) via SetHelpFunc override in root.go.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: filipi86

internal/cli/banner.go

@@ -50,6 +50,16 @@ func PrintDragonBanner() {
 		return nCyan("  ║ ") + padTo(content, W-1) + nCyan("║")
 	}
 
+	// centerIn centers content inside a boxLine (accounts for ANSI codes).
+	centerIn := func(content string) string {
+		vl := visualLen(content)
+		pad := (W - 1 - vl) / 2
+		if pad < 0 {
+			pad = 0
+		}
+		return strings.Repeat(" ", pad) + content
+	}
+
 	fmt.Println()
 	fmt.Println(topBdr)
 	fmt.Println(boxLine(
@@ -58,23 +68,24 @@ func PrintDragonBanner() {
 			dim("  │  SAST · SCA · LEAKS · GIT-HISTORY · IaC")))
 	fmt.Println(midBdr)
 
-	// ── DROGONSEC  — large ASCII title (inside frame) ─────────────────────────
-	fmt.Println(boxLine(""))
-	fmt.Println(boxLine(title(` ██████╗ ██████╗  ██████╗  ██████╗  ██████╗ ███╗  ██╗███████╗███████╗ ██████╗`)))
-	fmt.Println(boxLine(title(` ██╔══██╗██╔══██╗██╔═══██╗██╔════╝ ██╔═══██╗████╗ ██║██╔════╝██╔════╝██╔════╝`)))
-	fmt.Println(boxLine(title(` ██║  ██║██████╔╝██║   ██║██║  ███╗██║   ██║██╔██╗██║███████╗█████╗  ██║     `)))
-	fmt.Println(boxLine(title(` ██║  ██║██╔══██╗██║   ██║██║   ██║██║   ██║██║╚██╗██║╚════██║██╔══╝  ██║     `)))
-	fmt.Println(boxLine(title(` ██████╔╝██║  ██║╚██████╔╝╚██████╔╝╚██████╔╝██║ ╚████║███████║███████╗╚██████╗`)))
-	fmt.Println(boxLine(title(` ╚═════╝ ╚═╝  ╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═══╝╚══════╝╚══════╝ ╚═════╝`)))
-	fmt.Println(boxLine(""))
-
-	// ── Security statement (inside frame) ─────────────────────────────────────
-	fmt.Println(boxLine(
-		nMag("◆") + " " + bold("HUNT VULNERABILITIES") + "  " +
-			nMag("◆") + " " + bold("BREAK WALLS") + "  " +
-			nMag("◆") + " " + bold("SECURE CODE") + "  " +
-			nMag("◆")))
-	fmt.Println(boxLine(""))
+	// ── DROGONSEC  — large ASCII title (outside boxLine to avoid double-width
+	//    character misalignment; the ╠═══╣ borders above and below act as frame)
+	fmt.Println()
+	fmt.Println("  " + title(` ██████╗ ██████╗  ██████╗  ██████╗  ██████╗ ███╗  ██╗███████╗███████╗ ██████╗`))
+	fmt.Println("  " + title(` ██╔══██╗██╔══██╗██╔═══██╗██╔════╝ ██╔═══██╗████╗ ██║██╔════╝██╔════╝██╔════╝`))
+	fmt.Println("  " + title(` ██║  ██║██████╔╝██║   ██║██║  ███╗██║   ██║██╔██╗██║███████╗█████╗  ██║     `))
+	fmt.Println("  " + title(` ██║  ██║██╔══██╗██║   ██║██║   ██║██║   ██║██║╚██╗██║╚════██║██╔══╝  ██║     `))
+	fmt.Println("  " + title(` ██████╔╝██║  ██║╚██████╔╝╚██████╔╝╚██████╔╝██║ ╚████║███████║███████╗╚██████╗`))
+	fmt.Println("  " + title(` ╚═════╝ ╚═╝  ╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═══╝╚══════╝╚══════╝ ╚═════╝`))
+	fmt.Println()
+
+	// ── Security statement — centered inside frame ────────────────────────────
+	fmt.Println(midBdr)
+	stmt := nMag("◆") + " " + bold("HUNT VULNERABILITIES") + "  " +
+		nMag("◆") + " " + bold("BREAK WALLS") + "  " +
+		nMag("◆") + " " + bold("SECURE CODE") + "  " +
+		nMag("◆")
+	fmt.Println(boxLine(centerIn(stmt)))
 
 	// ── Bottom box: capabilities + author tagline ─────────────────────────────
 	fmt.Println(midBdr)

internal/cli/root.go

@@ -48,6 +48,15 @@ func init() {
 
 	viper.BindPFlag("verbose", rootCmd.PersistentFlags().Lookup("verbose"))
 
+	// Show banner on -h / --help for all commands.
+	// PersistentPreRun handles banner for normal execution; Cobra skips
+	// PreRun hooks for help, so we override HelpFunc here instead.
+	origHelp := rootCmd.HelpFunc()
+	rootCmd.SetHelpFunc(func(cmd *cobra.Command, args []string) {
+		PrintDragonBanner()
+		origHelp(cmd, args)
+	})
+
 	// Register sub-commands
 	rootCmd.AddCommand(scanCmd)
 	rootCmd.AddCommand(versionCmd)