Integrate DS4 execution parity in Rust

src/app/preferences.rs

@@ -3,6 +3,7 @@ use super::*;
 #[derive(Clone)]
 pub(super) struct PreferenceDraft {
     pub(super) model: ModelChoice,
+    pub(super) legacy_mtp_enabled: bool,
     pub(super) dspark_enabled: bool,
     pub(super) idle_timeout_minutes: String,
     pub(super) endpoint_port: String,
@@ -51,6 +52,7 @@ impl PreferenceDraft {
         let speculative = &runtime.speculative;
         Self {
             model: config.model,
+            legacy_mtp_enabled: speculative.legacy_mtp_enabled,
             dspark_enabled: speculative.dspark_enabled,
             idle_timeout_minutes: config.idle_timeout_minutes.to_string(),
             endpoint_port: config.endpoint.port.to_string(),
@@ -136,6 +138,7 @@ impl PreferenceDraft {
         Ok(SpeculativePreferences {
             mtp_draft_tokens: parse_positive_i32("MTP draft tokens", &self.mtp_draft_tokens)?,
             mtp_margin: parse_f32("MTP margin", &self.mtp_margin)?,
+            legacy_mtp_enabled: self.legacy_mtp_enabled,
             glm_mtp: self.glm_mtp,
             glm_mtp_timing: self.glm_mtp_timing,
             dspark_enabled: self.dspark_enabled,