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/app/commands.rs

@@ -1429,6 +1429,22 @@ impl OpenCADStudio {
                 self.tabs[i].active_cmd = Some(Box::new(new_cmd));
             }
 
+            "TEXTEDIT" | "TEDIT" => {
+                use crate::modules::annotate::textedit::TexteditCommand;
+                let mode_str = if self.texteditmode { "Single" } else { "Multiple" };
+                self.command_line.push_output(&format!("Current settings: Edit mode = {}", mode_str));
+                let new_cmd = TexteditCommand::new(self.texteditmode);
+                self.command_line.push_info(&new_cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(new_cmd));
+            }
+
+            "TEXTEDITMODE" => {
+                use crate::modules::annotate::textedit::TexteditmodeCommand;
+                let cmd = TexteditmodeCommand::new(self.texteditmode);
+                self.command_line.push_info(&cmd.prompt());
+                self.tabs[i].active_cmd = Some(Box::new(cmd));
+            }
+
             "DIMALIGNED" | "DAL" => {
                 use crate::modules::annotate::aligned_dim::AlignedDimensionCommand;
                 let cmd = AlignedDimensionCommand::new();
@@ -4907,6 +4923,21 @@ impl OpenCADStudio {
                     );
                 }
             }
+            cmd if cmd.starts_with("TEXTEDITMODE ") => {
+                let val_str = cmd.trim_start_matches("TEXTEDITMODE").trim().to_lowercase();
+                if val_str.is_empty() {
+                    let v = if self.texteditmode { 1 } else { 0 };
+                    self.command_line.push_output(&format!("TEXTEDITMODE = {v}"));
+                } else if val_str == "0" || val_str == "m" || val_str == "multiple" {
+                    self.texteditmode = false;
+                    self.command_line.push_output("TEXTEDITMODE set to 0");
+                } else if val_str == "1" || val_str == "s" || val_str == "single" {
+                    self.texteditmode = true;
+                    self.command_line.push_output("TEXTEDITMODE set to 1");
+                } else {
+                    self.command_line.push_error("Requires 0 OR 1 OR MULTIPLE OR SINGLE");
+                }
+            }
             cmd if cmd == "PDSIZE" || cmd.starts_with("PDSIZE ") => {
                 let val_str = cmd.trim_start_matches("PDSIZE").trim();
                 if val_str.is_empty() {