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>

CHANGELOG.md

@@ -38,6 +38,15 @@ All notable changes to Jarl are documented here. The format follows
     many views there are.
   - A `blocking` permission; database schema 6.
 
+### Changed
+
+- Web UI options (server, top-level, view and zone): values with blocks,
+  such as logging, are shown and edited laid out as in named.conf, over
+  several lines with indentation. The editor grows with its content, Tab
+  indents and Enter keeps the indentation (Esc, then Tab, moves on). With
+  a draft open, the tables show the draft's values, so a staged edit stays
+  visible after Save.
+
 ### Fixed
 
 - docs/validation.md lacked the `disabled_conflict` warning added in 0.3.0.