fix: restore missing switch-profiles row in Settings hub

The action, i18n strings, and app-level routing to ProfileList already
existed, but no row in the Settings hub ever called onSwitchProfiles,
so there was no way to reach it from the UI.

shared/src/commonMain/kotlin/com/fluxa/app/shared/feature/settings/SettingsScreen.kt

@@ -350,6 +350,10 @@ private fun SettingsHubContent(
                 modifier = Modifier.size(20.dp)
             )
         }
+        SettingsNavRow(
+            AppStrings.t(lang, "settings.switch_profiles"),
+            icon = Icons.Filled.AccountCircle
+        ) { onSwitchProfiles() }
     }
 
     SettingsSectionHeader(AppStrings.t(lang, "settings.section_preferences"))