feat: optimize network stack (#404)

* feat: optimize network stack and connection management

Refactor OkHttp connection pools, consolidate Gson serialization, add network-aware WebSocket reconnects, and deduplicate concurrent requests.

* test: update mapping assertions for AuthExpired

* refactor: address PR review feedback on network stack

Simplify health check, improve authenticator cookie matching robustness, resolve nit imports, and add unit tests.

app/src/main/java/com/m57/hermescontrol/ui/cron/CronJobsViewModel.kt

@@ -9,6 +9,7 @@ import com.m57.hermescontrol.data.remote.safeApiCall
 import com.m57.hermescontrol.ui.common.ToastHost
 import com.m57.hermescontrol.ui.common.safeLaunchLoad
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
@@ -23,26 +24,32 @@ data class CronJobsUiState(
     val toastMessage: String? = null,
 )
 
-class CronJobsViewModel : ViewModel(), ToastHost {
+class CronJobsViewModel :
+    ViewModel(),
+    ToastHost {
     private val _uiState = MutableStateFlow(CronJobsUiState())
     val uiState: StateFlow<CronJobsUiState> = _uiState.asStateFlow()
 
+    private var loadJob: Job? = null
+
     fun loadCronJobs() {
-        safeLaunchLoad(
-            apiCall = { safeApiCall { ApiClient.hermesApi.getCronJobs() } },
-            onStart = { _uiState.update { it.copy(isLoading = true, errorMessage = null) } },
-            onSuccess = { data ->
-                _uiState.update { it.copy(isLoading = false, jobs = data.orEmpty()) }
-            },
-            onError = { errorMsg ->
-                _uiState.update {
-                    it.copy(
-                        isLoading = false,
-                        errorMessage = "Failed to load cron jobs: $errorMsg",
-                    )
-                }
-            },
-        )
+        loadJob =
+            safeLaunchLoad(
+                currentJob = loadJob,
+                apiCall = { safeApiCall { ApiClient.hermesApi.getCronJobs() } },
+                onStart = { _uiState.update { it.copy(isLoading = true, errorMessage = null) } },
+                onSuccess = { data ->
+                    _uiState.update { it.copy(isLoading = false, jobs = data.orEmpty()) }
+                },
+                onError = { errorMsg ->
+                    _uiState.update {
+                        it.copy(
+                            isLoading = false,
+                            errorMessage = "Failed to load cron jobs: $errorMsg",
+                        )
+                    }
+                },
+            )
     }
 
     fun pauseCronJob(id: String) {