Start impl UI

core/common/src/main/java/ru/fincode/tsudesk/core/common/model/AppError.kt

@@ -1,7 +1,12 @@
 package ru.fincode.tsudesk.core.common.model
+
 sealed interface AppError {
     data object NoInternet : AppError
     data object Timeout : AppError
+
+    /** Временный сбой соединения (EOF / unexpected end of stream / reset) */
+    data object Temporary : AppError
+
     data class Http(val code: Int) : AppError
     data class Unknown(val message: String? = null) : AppError
-}
+}

core/common/src/main/java/ru/fincode/tsudesk/core/common/model/DataResult.kt

@@ -3,10 +3,16 @@ package ru.fincode.tsudesk.core.common.model
 sealed interface DataResult<out T> {
 
     data class Data<T>(
-        val data: T, val refreshedFromNetwork: Boolean
+        val data: T,
+        val refreshedFromNetwork: Boolean
     ) : DataResult<T>
 
     data class Error<T>(
-        val error: AppError, val data: T? = null, val cause: Throwable? = null
+        val error: AppError,
+        val data: T? = null,
+        val cause: Throwable? = null
     ) : DataResult<T>
-}
+
+    /** Состояние загрузки */
+    data object Loading : DataResult<Nothing>
+}