merge: TEXTEDIT command + TEXTEDITMODE sysvar (#130)

Merge PR #130 (KarimJerbi) and resolve review findings:

- Conflict (settings.rs): keep current persisted-settings layout, append
  texteditmode field.
- Conflict (command/mod.rs): keep both new CmdResult variants — main's
  live-entity ops and the PR's text-edit suspend/resume.
- Bug: invalid TEXTEDITMODE value no longer aborts via the Measurement
  arm; it now re-prompts with the error and stays active.
- Dedup: single parse_texteditmode() helper replaces the value parsing
  duplicated across commands.rs, settings.rs and textedit.rs.
- Strip trailing whitespace.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/settings.rs

@@ -82,6 +82,8 @@ pub struct UserSettings {
     /// Linked plugin source repositories (`owner/repo`) the marketplace installs
     /// from.
     pub plugin_repos: Vec<String>,
+    /// Controls whether the TEXTEDIT command repeats automatically (0 = Multiple, 1 = Single).
+    pub texteditmode: bool,
 }
 
 impl Default for UserSettings {
@@ -105,6 +107,7 @@ impl Default for UserSettings {
             default_assoc_prompted: false,
             disabled_plugins: Vec::new(),
             plugin_repos: Vec::new(),
+            texteditmode: false,
         }
     }
 }
@@ -138,6 +141,13 @@ impl UserSettings {
                 "osnap" => s.snap_enabled = val == "1",
                 "otrack" => s.otrack = val == "1",
                 "default_assoc_prompted" => s.default_assoc_prompted = val == "1",
+                "texteditmode" => {
+                    if let Some(v) =
+                        crate::modules::annotate::textedit::parse_texteditmode(val)
+                    {
+                        s.texteditmode = v;
+                    }
+                }
                 "disabled_plugins" => {
                     s.disabled_plugins = val
                         .split(',')
@@ -179,7 +189,7 @@ impl UserSettings {
             .collect::<Vec<_>>()
             .join(",");
         let body = format!(
-            "dyn={}\northo={}\npolar={}\npolar_increment_deg={}\nosnap={}\notrack={}\ndefault_assoc_prompted={}\nsnap_modes={}\ndisabled_plugins={}\nplugin_repos={}\n",
+            "dyn={}\northo={}\npolar={}\npolar_increment_deg={}\nosnap={}\notrack={}\ndefault_assoc_prompted={}\nsnap_modes={}\ndisabled_plugins={}\nplugin_repos={}\ntexteditmode={}\n",
             b(self.dyn_input),
             b(self.ortho),
             b(self.polar),
@@ -190,6 +200,7 @@ impl UserSettings {
             modes,
             self.disabled_plugins.join(","),
             self.plugin_repos.join(","),
+            self.texteditmode,
         );
         let _ = std::fs::write(path, body);
     }