refactor: Remove deprecated instruction logging feature

- Eliminated the kLogInstructions flag and associated logging functionality, as the DisassemblyViewer is now always active and utilizes a more efficient sparse address-map recording method.
- Updated relevant code across multiple files to reflect the removal of the deprecated feature, ensuring cleaner and more maintainable code.
- Adjusted UI elements and serialization methods to remove references to the obsolete logging feature, streamlining the user experience.

src/app/gui/feature_flags_menu.h

@@ -59,8 +59,8 @@ struct FlagsMenu {
     Checkbox("Enable Console Logging", &core::FeatureFlags::get().kLogToConsole);
     Checkbox("Enable Performance Monitoring",
              &core::FeatureFlags::get().kEnablePerformanceMonitoring);
-    Checkbox("Log Instructions to Emulator Debugger",
-             &core::FeatureFlags::get().kLogInstructions);
+    // REMOVED: "Log Instructions" - DisassemblyViewer is always active
+    // Use the viewer's UI controls to enable/disable recording if needed
     Checkbox("Use Native File Dialog (NFD)",
              &core::FeatureFlags::get().kUseNativeFileDialog);
   }