fix(#290): code health — magic colors, flag params, silent catch (#353)

* fix(#290): use LocalHermesStatusColors instead of magic colors (CODE-33)

* fix(#290): replace boolean-flag params with sealed NavIcon class (CODE-37)

* fix(#290): resolve compilation errors — Color import + nullable NavIcon params

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/config/ConfigScreen.kt

@@ -33,6 +33,7 @@ import com.m57.hermescontrol.R
 import com.m57.hermescontrol.ui.common.ErrorState
 import com.m57.hermescontrol.ui.common.HermesScaffold
 import com.m57.hermescontrol.ui.common.LoadingState
+import com.m57.hermescontrol.ui.common.NavIcon
 import com.m57.hermescontrol.ui.common.ToastEffect
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -53,7 +54,7 @@ fun ConfigScreen(
 
     HermesScaffold(
         title = { Text(stringResource(R.string.config_screen_title)) },
-        onOpenDrawer = onOpenDrawer,
+        navigationIcon = onOpenDrawer?.let { NavIcon.Menu(it) },
         isRefreshing = state.isLoading,
         onRefresh = { viewModel.loadRawConfig() },
     ) { paddingValues ->