fix(chat): restore pending approval guard, tighten encapsulation, drop dormant tracker

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatApprovalsDelegate.kt

@@ -81,8 +81,12 @@ class ChatApprovalsDelegate(
         @Suppress("UNCHECKED_CAST")
         val approvals = (result as? Map<*, *>)?.get("approvals") as? List<*>
         val first = approvals?.filterIsInstance<Map<*, *>>()?.firstOrNull() ?: return
+        val requestId = first["request_id"] as? String ?: return
         val sessionId = runtimeSessionId() ?: uiState.value.currentSessionId
-        maybeSurfacePendingApproval(first, sessionId)
+        val alreadyShown =
+            uiState.value.messages.any { it.approvalInfo?.requestId == requestId }
+        if (alreadyShown) return
+        handleApprovalRequest(parseApprovalMap(first, sessionId))
     }
 
     fun handleApprovalRespondResult(result: Any?) {

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatModelSwitchDelegate.kt

@@ -19,7 +19,7 @@ import java.util.concurrent.ConcurrentHashMap
  * Tracks an in-flight `config.set key=model` RPC and the model it would replace
  * so confirmation dialog dismiss can roll back optimistically.
  */
-data class ActiveModelSwitch(
+private data class ActiveModelSwitch(
     val spec: String,
     val previousModel: String?,
 )
@@ -47,10 +47,10 @@ class ChatModelSwitchDelegate(
     private val getPinnedModels: () -> List<PinnedModel> = { AuthManager.getPinnedModels() },
     private val savePinnedModels: (List<PinnedModel>) -> Unit = { AuthManager.savePinnedModels(it) },
 ) {
-    val pendingModelSwitchRequests = ConcurrentHashMap<String, ActiveModelSwitch>()
-    var activeModelSwitchConfirmation: ActiveModelSwitch? = null
-    var optimisticPreviousModel: String? = null
-    var cachedModelOptions: List<ModelProvider> = emptyList()
+    private val pendingModelSwitchRequests = ConcurrentHashMap<String, ActiveModelSwitch>()
+    private var activeModelSwitchConfirmation: ActiveModelSwitch? = null
+    private var optimisticPreviousModel: String? = null
+    private var cachedModelOptions: List<ModelProvider> = emptyList()
 
     fun isModelPickerCommand(command: String): Boolean {
         val trimmed = command.trim()

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatRpcRequestTracker.kt

@@ -1,111 +0,0 @@
-package com.m57.hermescontrol.ui.chat
-
-import java.util.concurrent.ConcurrentHashMap
-
-/**
- * Tracks an in-flight RPC request associated with a specific session generation
- * and resume sequence to guard against stale results/errors from previous sessions.
- */
-data class TrackedSessionRequest(
-    val generation: Long,
-    val resumeSequence: Long = 0L,
-    val sessionId: String? = null,
-)
-
-/**
- * Owns RPC id-to-method mapping, session request generations, hydration sequences,
- * and staleness detection.
- *
- * Extracted behavior-preservingly from [ChatViewModel] to ensure deterministic
- * RPC tracking across session creation, switches, resumes, and reconnects.
- */
-class ChatRpcRequestTracker(
-    private val getCurrentSessionId: () -> String?,
-) {
-    /** Maps an in-flight RPC id to its method for UI error labeling. */
-    private val idToMethod = ConcurrentHashMap<String, String>()
-    private val sessionRequestById = ConcurrentHashMap<String, TrackedSessionRequest>()
-
-    var sessionGeneration: Long = 0L
-        private set
-
-    var resumeRequestSequence: Long = 0L
-        private set
-    var activeResumeRequestSequence: Long = 0L
-        private set
-
-    var hydrationRequestSequence: Long = 0L
-        private set
-    var activeHydrationRequestSequence: Long = 0L
-        private set
-
-    var resumedGeneration: Long = -1L
-    var hydratedGeneration: Long = -1L
-
-    fun nextSessionGeneration(): Long {
-        sessionGeneration++
-        return sessionGeneration
-    }
-
-    fun nextResumeSequence(): Long {
-        resumeRequestSequence++
-        activeResumeRequestSequence = resumeRequestSequence
-        return resumeRequestSequence
-    }
-
-    fun nextHydrationSequence(): Long {
-        hydrationRequestSequence++
-        activeHydrationRequestSequence = hydrationRequestSequence
-        return hydrationRequestSequence
-    }
-
-    fun trackRequest(
-        id: String,
-        method: String,
-    ) {
-        idToMethod[id] = method
-    }
-
-    fun trackSessionRequest(
-        id: String,
-        method: String,
-        generation: Long,
-        resumeSequence: Long = 0L,
-        sessionId: String? = null,
-    ) {
-        sessionRequestById[id] = TrackedSessionRequest(generation, resumeSequence, sessionId)
-        trackRequest(id, method)
-    }
-
-    fun isCurrentSessionRequest(
-        sessionId: String,
-        generation: Long,
-    ): Boolean = generation == sessionGeneration && sessionId == getCurrentSessionId()
-
-    fun isCurrentHydration(
-        sessionId: String,
-        generation: Long,
-        requestSequence: Long,
-    ): Boolean = requestSequence == activeHydrationRequestSequence && isCurrentSessionRequest(sessionId, generation)
-
-    fun isStaleSessionRequest(id: String): Boolean = sessionRequestById[id]?.let(::isStaleSessionRequest) == true
-
-    fun isStaleSessionRequest(request: TrackedSessionRequest): Boolean =
-        request.generation != sessionGeneration ||
-            (request.sessionId != null && request.sessionId != getCurrentSessionId()) ||
-            (request.resumeSequence != 0L && request.resumeSequence != activeResumeRequestSequence)
-
-    fun removeMethod(id: String): String? = idToMethod.remove(id)
-
-    fun removeSessionRequest(id: String): TrackedSessionRequest? = sessionRequestById.remove(id)
-
-    fun forgetRequest(id: String) {
-        idToMethod.remove(id)
-        sessionRequestById.remove(id)
-    }
-
-    fun resetSessionStateTracking() {
-        resumedGeneration = -1L
-        hydratedGeneration = -1L
-    }
-}

app/src/main/java/com/m57/hermescontrol/ui/chat/ChatViewModel.kt

@@ -510,11 +510,6 @@ class ChatViewModel(
     private val sessionRequestById = ConcurrentHashMap<String, SessionRequest>()
     private var sessionGeneration = 0L
 
-    private data class ActiveModelSwitch(
-        val spec: String,
-        val previousModel: String?,
-    )
-
     private var resumeRequestSequence = 0L
     private var activeResumeRequestSequence = 0L
     private var hydrationRequestSequence = 0L