Merge TASK-1077 iOS home scroll observation-boundary root fix

Cut the home view tree's observation dependency on the god model:
independent root navigation store, home view no longer holds the whole
model, rows take value objects + action closures. Removes the build105
scroll-freeze patch. Debug probe: model_publish~60 but root/home body~2-3,
hitch_time_ratio 0.0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Pyiner

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileAutomationViews.swift

@@ -1015,7 +1015,7 @@ struct GaryxAutomationThreadPickerRow: View {
         VStack(spacing: 0) {
             GaryxSwipeActionRow(id: "thread:\(thread.id)", actions: threadSwipeActions) {
                 GaryxSidebarThreadRowView(
-                    model: GaryxSidebarThreadRowPresentation(
+                    presentation: GaryxSidebarThreadRowPresentation(
                         thread: thread,
                         isSelected: isSelected,
                         isPinned: isPinned,

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileModel+Gateway.swift

@@ -160,7 +160,7 @@ extension GaryxMobileModel {
         selectedAutomationEditor = nil
         selectedAgentDetail = nil
         selectedTeamDetail = nil
-        selectedRouteNotFound = nil
+        routeNotFoundStore.selection = nil
         isLoadingThreads = false
         remoteStateLoadPhase = .idle
         isLoadingSelectedThreadHistory = false

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileModel+Navigation.swift

@@ -344,13 +344,13 @@ extension GaryxMobileModel {
         selectedAutomationEditor = nil
         selectedAgentDetail = nil
         selectedTeamDetail = nil
-        selectedRouteNotFound = nil
+        routeNotFoundStore.selection = nil
         closeSkillDetail()
     }
 
     private func showRouteNotFound(kind: String, id: String) {
         let target = id.trimmingCharacters(in: .whitespacesAndNewlines)
-        selectedRouteNotFound = GaryxMobileRouteNotFound(
+        routeNotFoundStore.selection = GaryxMobileRouteNotFound(
             title: "\(kind) Not Found",
             message: target.isEmpty
                 ? "Garyx could not find the requested \(kind.lowercased())."

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileModel+Presentation.swift

@@ -5,26 +5,10 @@ import WidgetKit
 
 extension GaryxMobileModel {
     func refreshHomeThreadListSnapshot() {
-        homeThreadListStore.applyUnlessInteracting(
-            isThreadListInteracting: isThreadListInteracting
-        ) {
-            homeThreadListInput
-        }
-    }
-
-    func setThreadListInteracting(_ isInteracting: Bool) {
-        guard isThreadListInteracting != isInteracting else { return }
-        isThreadListInteracting = isInteracting
-        guard !isInteracting else { return }
-        homeThreadListStore.flushDeferredInteractionRefresh {
-            homeThreadListInput
-        }
-        flushDeferredRecentThreadsWidgetSnapshotPersistence()
-    }
-
-    func endThreadListInteractionIfHomeBecameHidden(previousNavigationState: GaryxMobileNavigationState) {
-        guard !previousNavigationState.presentsContent, navigationState.presentsContent else { return }
-        setThreadListInteracting(false)
+        #if DEBUG
+        GaryxHomeScrollPerformanceProbe.shared.markHomeListStoreApply()
+        #endif
+        homeThreadListStore.apply(homeThreadListInput)
     }
 
     var homeThreadListInput: GaryxHomeThreadListInput {
@@ -212,6 +196,65 @@ extension GaryxMobileModel {
         return true
     }
 
+    #if DEBUG
+    func startHomeScrollPressureProbeIfRequested() {
+        let environment = ProcessInfo.processInfo.environment
+        let arguments = CommandLine.arguments
+        guard environment["GARYX_MOBILE_HOME_SCROLL_PROBE"] == "1"
+            || arguments.contains("--garyx-home-scroll-probe")
+        else { return }
+        debugSnapshotActive = true
+        loadHomeScrollPressureFixture()
+        Task { [weak self] in
+            try? await Task.sleep(nanoseconds: 500_000_000)
+            guard let self else { return }
+            let probe = GaryxHomeScrollPerformanceProbe.shared
+            probe.beginWindow(label: "home_scroll_60hz_render_snapshot")
+            let threadId = "thread-0"
+            for tick in 0..<60 {
+                guard !Task.isCancelled else { break }
+                renderSnapshotsByThread[threadId] = GaryxRenderSnapshot(
+                    basedOnSeq: tick,
+                    rows: [],
+                    tailActivity: .thinking,
+                    visibleMessageIds: ["message-\(tick)"]
+                )
+                try? await Task.sleep(nanoseconds: 16_666_667)
+            }
+            _ = probe.endWindow()
+        }
+    }
+
+    private func loadHomeScrollPressureFixture() {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime]
+        let now = Date()
+        threads = (0..<50).map { index in
+            GaryxThreadSummary(
+                id: "thread-\(index)",
+                title: "Synthetic thread \(index)",
+                createdAt: formatter.string(from: now.addingTimeInterval(Double(-index) * 3_600)),
+                updatedAt: formatter.string(from: now.addingTimeInterval(Double(-index) * 180)),
+                lastMessagePreview: "Synthetic preview \(index)",
+                workspacePath: "/Users/test/workspaces/project-\(index % 6)",
+                messageCount: 10 + index,
+                agentId: "agent-\(index % 4)",
+                teamId: nil,
+                teamName: nil,
+                providerType: "codex",
+                recentRunId: "run-\(index)",
+                activeRunId: index == 0 ? "run-\(index)" : nil,
+                runState: index == 0 ? "running" : "idle",
+                worktreePath: nil
+            )
+        }
+        pinnedThreadIds = (0..<6).map { "thread-\($0)" }
+        recentThreadIds = (0..<50).map { "thread-\($0)" }
+        connectionState = .ready(version: "debug-home-scroll-probe")
+        refreshHomeThreadListSnapshot()
+    }
+    #endif
+
     func sidebarThreadSummary(for threadId: String) -> GaryxThreadSummary? {
         let normalizedId = threadId.trimmingCharacters(in: .whitespacesAndNewlines)
         guard !normalizedId.isEmpty else { return nil }

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileModel+Threads.swift

@@ -269,10 +269,6 @@ extension GaryxMobileModel {
     }
 
     func persistRecentThreadsWidgetSnapshot() {
-        guard !isThreadListInteracting else {
-            hasDeferredRecentThreadsWidgetSnapshotPersistence = true
-            return
-        }
         var summariesById: [String: GaryxThreadSummary] = [:]
         for thread in threads where summariesById[thread.id] == nil {
             summariesById[thread.id] = thread
@@ -307,12 +303,6 @@ extension GaryxMobileModel {
         WidgetCenter.shared.reloadTimelines(ofKind: GaryxRecentThreadsWidgetConstants.kind)
     }
 
-    func flushDeferredRecentThreadsWidgetSnapshotPersistence() {
-        guard hasDeferredRecentThreadsWidgetSnapshotPersistence else { return }
-        hasDeferredRecentThreadsWidgetSnapshotPersistence = false
-        persistRecentThreadsWidgetSnapshot()
-    }
-
     func widgetAgentIdentity(for thread: GaryxThreadSummary) -> WidgetAgentIdentity {
         let teamId = thread.teamId?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
         if !teamId.isEmpty {
@@ -593,12 +583,7 @@ extension GaryxMobileModel {
             return
         }
         let initialCandidateThreadIds = backgroundCommittedRunCandidateThreadIds()
-        guard GaryxBackgroundThreadReconcilePolicy.shouldRefreshThreads(
-            isThreadListInteracting: isThreadListInteracting,
-            candidateThreadIds: initialCandidateThreadIds
-        ) else {
-            return
-        }
+        guard initialCandidateThreadIds.contains(where: { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }) else { return }
         await refreshThreads(silent: true)
         guard runtimeGeneration == gatewayRuntimeGeneration else { return }
         for threadId in backgroundCommittedRunCandidateThreadIds() {

mobile/garyx-mobile/App/GaryxMobile/GaryxMobileModel.swift

@@ -33,6 +33,11 @@ struct GaryxMobileRouteNotFound: Identifiable, Equatable {
     let message: String
 }
 
+@MainActor
+final class GaryxRouteNotFoundStore: ObservableObject {
+    @Published var selection: GaryxMobileRouteNotFound?
+}
+
 @MainActor
 final class GaryxMobileModel: ObservableObject {
     static let threadListPageLimit = 30
@@ -132,7 +137,7 @@ final class GaryxMobileModel: ObservableObject {
     }
     @Published var navigationState = GaryxMobileNavigationState() {
         didSet {
-            endThreadListInteractionIfHomeBecameHidden(previousNavigationState: oldValue)
+            rootNavigationPathStore.apply(navigationState: navigationState)
             refreshHomeThreadListSnapshot()
         }
     }
@@ -215,7 +220,6 @@ final class GaryxMobileModel: ObservableObject {
     @Published var selectedAutomationEditor: GaryxAutomationSummary?
     @Published var selectedAgentDetail: GaryxAgentSummary?
     @Published var selectedTeamDetail: GaryxTeamSummary?
-    @Published var selectedRouteNotFound: GaryxMobileRouteNotFound?
     var skillEditorLoadRequestId: UUID?
     var skillFileLoadRequestId: UUID?
     @Published var draftThreadTitle = ""
@@ -291,9 +295,9 @@ final class GaryxMobileModel: ObservableObject {
     var workspaceRefreshRequestId: UUID?
     var nextThreadListOffset = 0
     var lastPersistedWidgetThreads: [GaryxMobileWidgetThread]?
-    var hasDeferredRecentThreadsWidgetSnapshotPersistence = false
+    let rootNavigationPathStore = GaryxRootNavigationPathStore()
+    let routeNotFoundStore = GaryxRouteNotFoundStore()
     let homeThreadListStore = GaryxHomeThreadListStore()
-    var isThreadListInteracting = false
     var hasAttemptedLastOpenedThreadRestore = false
     var selectedThreadNextHistoryBeforeIndex: Int?
     var sceneRefreshTask: Task<Void, Never>?
@@ -345,6 +349,11 @@ final class GaryxMobileModel: ObservableObject {
             )
         }
         #endif
+        rootNavigationPathStore.apply(navigationState: navigationState)
         refreshHomeThreadListSnapshot()
+        #if DEBUG
+        GaryxHomeScrollPerformanceProbe.shared.attachModelObjectWillChange(objectWillChange)
+        startHomeScrollPressureProbeIfRequested()
+        #endif
     }
 }