ui: neutral wording in code and help text; keywords first in the command menu

Comments and the Options help text describe the behaviour of commercial
solutions without naming any product. The command menu puts the command's
keywords directly under Enter / Cancel, with Recent Input and Snap
Overrides below them, so the choices that change from step to step are the
closest to the pointer.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/app/update/mod.rs

@@ -304,7 +304,7 @@ impl OpenCADStudio {
         }
         // The open right-click context menu owns the keyboard the same way:
         // arrows / Enter / mnemonic letters drive it, any other key closes it
-        // and falls through to the command line (AutoCAD behaviour).
+        // and falls through to the command line (the behaviour of commercial solutions).
         if self.context_menu_open() {
             if let Some(task) = self.intercept_context_menu_key(&msg) {
                 return task;
@@ -3582,7 +3582,7 @@ impl OpenCADStudio {
                     return self.update(Message::CommandFinalize);
                 }
                 // A right-click. What it does is the user's choice (Options →
-                // User Preferences, AutoCAD's SHORTCUTMENU):
+                // User Preferences, SHORTCUTMENU in commercial solutions):
                 //  • Shortcut menu — always open the context menu, whose
                 //    default row (Enter / Repeat) sits under the pointer.
                 //  • Time-sensitive — a quick click is Enter while a command
@@ -3607,7 +3607,7 @@ impl OpenCADStudio {
                     sel.right_click_entered = true;
                     drop(sel);
                     // CommandFinalize is Enter during a command and "repeat
-                    // the last command" when idle — exactly AutoCAD's quick
+                    // the last command" when idle — exactly the quick
                     // right-click.
                     return self.update(Message::CommandFinalize);
                 }