Show and edit option values laid out as in named.conf

Values with blocks (logging, controls, ...) are shown over several lines
with indentation, and edited that way: the editor grows with its content,
Tab indents, Enter keeps the indentation. With a draft open, option tables
show the draft's values.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/server/present.go

@@ -9,6 +9,7 @@ import (
 	"jarl/internal/dnsname"
 	"jarl/internal/engine"
 	"jarl/internal/model"
+	"jarl/internal/namedconf"
 	"jarl/internal/render"
 	"jarl/internal/rr"
 	"jarl/internal/version"
@@ -100,6 +101,9 @@ func presentOption(st *model.State, o *model.Option) api.Option {
 	if c, ok := catalog.Default().Lookup(scope, o.Name); ok {
 		out.Description, out.Status = c.Description, c.Status
 	}
+	if f := namedconf.FormatValue(o.Name, o.Value); f != o.Value {
+		out.Formatted = f
+	}
 	return out
 }