Block Attribute Manager window (BATTMAN / ATTMAN)

BATTMAN and ATTMAN open a manager for the attribute definitions of one
attributed block: block chips with reference counts and a pick button,
a table whose columns are chosen with chips, move up/down, remove, and
an edit card (Attribute / Text / Properties) for the selected row. Apply,
OK and Sync write the list back to the block definition and, when asked,
rebuild the existing references keeping values through tag renames;
each is one undo step. Live changes are taken back on Cancel. Automation
gains attman_dialog.

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

src/app/commands/mod.rs

@@ -5,6 +5,7 @@ use iced::Task;
 use std::path::PathBuf;
 
 mod attdef;
+mod attman;
 mod block_cmdline;
 mod blocks;
 mod blockvars;