Add Graphic Attributes palette toggle and persistence

src/command.rs

@@ -308,6 +308,10 @@ pub struct ValuePromptCommand {
     prompt: &'static str,
 }
 
+fn dispatch_prompt_value(name: &str, text: &str) -> CmdResult {
+    CmdResult::Dispatch(format!("{name} {}", text.trim()))
+}
+
 impl ValuePromptCommand {
     pub fn new(name: &'static str, prompt: &'static str) -> Self {
         Self { name, prompt }
@@ -328,12 +332,7 @@ impl CadCommand for ValuePromptCommand {
     }
 
     fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
-        let t = text.trim();
-        if t.is_empty() {
-            Some(CmdResult::Dispatch(format!("{} ", self.name)))
-        } else {
-            Some(CmdResult::Dispatch(format!("{} {t}", self.name)))
-        }
+        Some(dispatch_prompt_value(self.name, text))
     }
 
     fn on_point(&mut self, _pt: DVec3) -> CmdResult {
@@ -343,7 +342,7 @@ impl CadCommand for ValuePromptCommand {
 
     fn on_enter(&mut self) -> CmdResult {
         // Bare Enter → report the current value via the inline handler.
-        CmdResult::Dispatch(format!("{} ", self.name))
+        dispatch_prompt_value(self.name, "")
     }
 }
 
@@ -375,7 +374,7 @@ impl CadCommand for FreeTextValuePromptCommand {
     }
 
     fn on_text_input(&mut self, text: &str) -> Option<CmdResult> {
-        Some(CmdResult::Dispatch(format!("{} {}", self.name, text.trim())))
+        Some(dispatch_prompt_value(self.name, text))
     }
 
     fn on_point(&mut self, _pt: DVec3) -> CmdResult {
@@ -383,7 +382,7 @@ impl CadCommand for FreeTextValuePromptCommand {
     }
 
     fn on_enter(&mut self) -> CmdResult {
-        CmdResult::Dispatch(format!("{} ", self.name))
+        dispatch_prompt_value(self.name, "")
     }
 }
 
@@ -3079,6 +3078,20 @@ mod constraint_registry_tests {
 mod tests {
     use super::*;
 
+    #[test]
+    fn prompt_dispatch_trims_values_and_preserves_empty_argument() {
+        let CmdResult::Dispatch(value) = dispatch_prompt_value("TEST", "  value with spaces  ")
+        else {
+            panic!("prompt input should dispatch a command");
+        };
+        assert_eq!(value, "TEST value with spaces");
+
+        let CmdResult::Dispatch(value) = dispatch_prompt_value("TEST", "  ") else {
+            panic!("empty prompt input should dispatch a command");
+        };
+        assert_eq!(value, "TEST ");
+    }
+
     #[test]
     fn test_mid2point_command() {
         let mut cmd = Mid2PointCommand::new();