fix(sync): erros 5xx viram Transient com retry; SSE multilinha; trata Failed/NotConfigured

- SyncOutcome.Transient para 5xx (push/pull/serverOutcome); worker da retry
- runSync: Failed -> Error, NotConfigured respeitado (evita cast crash)
- SseClient: junta linhas data: com \n (spec SSE)
- ApiClient: remove imports sem uso

app/src/main/java/com/labexposed/notas/data/remote/SseClient.kt

@@ -59,8 +59,11 @@ class SseClient(private val baseUrl: String, private val token: String, private
                 currentCoroutineContext().ensureActive()
                 val line = reader.readLine() ?: break
                 when {
-                    line.startsWith("data: ") -> data.append(line.removePrefix("data: "))
-                    line.startsWith("data:") -> data.append(line.removePrefix("data:").trimStart())
+                    line.startsWith("data:") -> {
+                        // evento multilinha: junta os blocos com \n (spec SSE)
+                        if (data.isNotEmpty()) data.append('\n')
+                        data.append(line.removePrefix("data:").trimStart())
+                    }
                     line.isEmpty() && data.isNotEmpty() -> {
                         val raw = data.toString()
                         data = StringBuilder()

app/src/main/java/com/labexposed/notas/domain/Models.kt

@@ -22,5 +22,7 @@ sealed class SyncOutcome {
     data class Success(val pushed: Int, val pulled: Int, val conflicts: Int) : SyncOutcome()
     data class NetworkDown(val message: String) : SyncOutcome()
     data object Unauthorized : SyncOutcome()
+    /** Erro transitório do servidor (5xx): pode repetir depois. */
+    data class Transient(val message: String) : SyncOutcome()
     data class Failed(val message: String) : SyncOutcome()
 }

app/src/main/java/com/labexposed/notas/domain/SyncEngine.kt

@@ -81,6 +81,19 @@ class SyncEngine(
             status.set { it.copy(phase = SyncPhase.Offline, message = push.message) }
             return push
         }
+        if (push is SyncOutcome.Transient) {
+            status.set { it.copy(phase = SyncPhase.Offline, message = push.message) }
+            return push
+        }
+
+        if (push is SyncOutcome.Failed) {
+            status.set { it.copy(phase = SyncPhase.Error, message = push.message) }
+            return push
+        }
+        if (push is SyncOutcome.NotConfigured) {
+            status.set { it.copy(phase = SyncPhase.NotConfigured) }
+            return push
+        }
 
         val pull = pull(client)
         if (pull is SyncOutcome.Unauthorized) {
@@ -91,6 +104,14 @@ class SyncEngine(
             status.set { it.copy(phase = SyncPhase.Offline, message = pull.message) }
             return pull
         }
+        if (pull is SyncOutcome.Transient) {
+            status.set { it.copy(phase = SyncPhase.Offline, message = pull.message) }
+            return pull
+        }
+        if (pull is SyncOutcome.Failed) {
+            status.set { it.copy(phase = SyncPhase.Error, message = pull.message) }
+            return pull
+        }
 
         val ok = (push as SyncOutcome.Success) to (pull as SyncOutcome.Success)
         val conflicts = ok.first.conflicts + ok.second.conflicts
@@ -151,6 +172,7 @@ class SyncEngine(
                         }
                         is ApiResult.Network -> return SyncOutcome.NetworkDown(resp.message)
                         is ApiResult.Unauthorized -> return SyncOutcome.Unauthorized
+                        is ApiResult.Server -> return serverOutcome("create ${note.id}", resp)
                         else -> return SyncOutcome.Failed("create ${note.id}: ${describe(resp)}")
                     }
                 }
@@ -189,6 +211,7 @@ class SyncEngine(
                         }
                         is ApiResult.Network -> return SyncOutcome.NetworkDown(resp.message)
                         is ApiResult.Unauthorized -> return SyncOutcome.Unauthorized
+                        is ApiResult.Server -> return serverOutcome("update ${note.id}", resp)
                         else -> return SyncOutcome.Failed("update ${note.id}: ${describe(resp)}")
                     }
                 }
@@ -200,6 +223,7 @@ class SyncEngine(
                             is ApiResult.Ok, is ApiResult.NotFound -> Unit
                             is ApiResult.Network -> return SyncOutcome.NetworkDown(resp.message)
                             is ApiResult.Unauthorized -> return SyncOutcome.Unauthorized
+                            is ApiResult.Server -> return serverOutcome("delete ${note.id}", resp)
                             else -> return SyncOutcome.Failed("delete ${note.id}: ${describe(resp)}")
                         }
                     }
@@ -290,12 +314,14 @@ class SyncEngine(
             }
             is ApiResult.Network -> return SyncOutcome.NetworkDown(cats.message)
             is ApiResult.Unauthorized -> return SyncOutcome.Unauthorized
+            is ApiResult.Server -> return serverOutcome("categories", cats)
             else -> {}
         }
 
         val list = client.listNotes()
         if (list is ApiResult.Network) return SyncOutcome.NetworkDown(list.message)
         if (list is ApiResult.Unauthorized) return SyncOutcome.Unauthorized
+        if (list is ApiResult.Server) return serverOutcome("list", list)
         if (list !is ApiResult.Ok) return SyncOutcome.Failed("list: ${describe(list)}")
 
         val serverIds = list.value.map { it.id }.toSet()
@@ -345,6 +371,10 @@ class SyncEngine(
 
     private fun NoteDetailDto.toEntity() = toNoteEntity()
 
+    private fun serverOutcome(prefix: String, r: ApiResult.Server): SyncOutcome =
+        if (r.code >= 500) SyncOutcome.Transient("$prefix: HTTP ${r.code} ${r.message}")
+        else SyncOutcome.Failed("$prefix: HTTP ${r.code} ${r.message}")
+
     private fun describe(r: ApiResult<*>): String = when (r) {
         is ApiResult.Server -> "HTTP ${r.code} ${r.message}"
         is ApiResult.Network -> r.message

app/src/main/java/com/labexposed/notas/sync/SyncWorker.kt

@@ -30,6 +30,7 @@ class SyncWorker(context: Context, params: WorkerParameters) :
         )
         return when (val outcome = engine.fullSync(trigger = inputData.getString(TRIGGER) ?: "auto")) {
             is com.labexposed.notas.domain.SyncOutcome.NetworkDown -> Result.retry()
+            is com.labexposed.notas.domain.SyncOutcome.Transient -> Result.retry()
             is com.labexposed.notas.domain.SyncOutcome.Failed -> Result.failure()
             is com.labexposed.notas.domain.SyncOutcome.Unauthorized -> Result.success()
             else -> Result.success()