feat: implement TEXTEDIT command and TEXTEDITMODE system variable

- Adds TEXTEDIT command to seamlessly edit annotation objects in-place.
- Matches industry-standard CAD tools' prompt behavior and "Current settings" banner logic.
- Implements the TEXTEDITMODE system variable (0/1) for Multiple vs Single editing modes.
- Enhances command lifecycle with CmdResult::SuspendForTextEdit and post_editor_closed hooks, allowing commands to cleanly pause and resume after external UI editors close.

src/modules/annotate/mod.rs

@@ -23,6 +23,7 @@ pub mod qdim;
 pub mod radius_dim;
 pub mod table_cmd;
 pub mod text;
+pub mod textedit;
 pub mod tolerance_cmd;
 
 use crate::modules::{CadModule, RibbonGroup, RibbonItem, StyleKey};