fix(ios): stabilize streaming layout updates

apps/shared/OpenClawKit/Sources/OpenClawChatUI/AssistantTextParser.swift

@@ -1,12 +1,19 @@
 import Foundation
 
-struct AssistantTextSegment: Identifiable {
-    enum Kind {
+struct AssistantTextSegment: Identifiable, Equatable {
+    enum Kind: Equatable {
         case thinking
         case response
+
+        var stableIDPrefix: String {
+            switch self {
+            case .thinking: "t"
+            case .response: "r"
+            }
+        }
     }
 
-    let id = UUID()
+    let id: String
     let kind: Kind
     let text: String
 }
@@ -16,7 +23,7 @@ enum AssistantTextParser {
         let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
         guard !trimmed.isEmpty else { return [] }
         guard raw.contains("<") else {
-            return [AssistantTextSegment(kind: .response, text: trimmed)]
+            return [AssistantTextSegment(id: "r0", kind: .response, text: trimmed)]
         }
 
         var segments: [AssistantTextSegment] = []
@@ -51,7 +58,7 @@ enum AssistantTextParser {
         }
 
         guard matchedTag else {
-            return [AssistantTextSegment(kind: .response, text: trimmed)]
+            return [AssistantTextSegment(id: "r0", kind: .response, text: trimmed)]
         }
 
         if includeThinking {
@@ -146,6 +153,11 @@ enum AssistantTextParser {
     {
         let trimmed = text.trimmingCharacters(in: .whitespacesAndNewlines)
         guard !trimmed.isEmpty else { return }
-        segments.append(AssistantTextSegment(kind: kind, text: trimmed))
+        let nextIndex = segments.count
+        segments.append(
+            AssistantTextSegment(
+                id: "\(kind.stableIDPrefix)\(nextIndex)",
+                kind: kind,
+                text: trimmed))
     }
 }

apps/shared/OpenClawKit/Sources/OpenClawChatUI/ChatView.swift

@@ -17,6 +17,7 @@ public struct OpenClawChatView: View {
     @State private var hasPerformedInitialScroll = false
     @State private var isPinnedToBottom = true
     @State private var lastUserMessageID: UUID?
+    @State private var pendingStreamingScrollTask: Task<Void, Never>?
     private let showsSessionSwitcher: Bool
     private let style: Style
     private let markdownVariant: ChatMarkdownVariant
@@ -83,6 +84,10 @@ public struct OpenClawChatView: View {
         }
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
         .onAppear { self.viewModel.load() }
+        .onDisappear {
+            self.pendingStreamingScrollTask?.cancel()
+            self.pendingStreamingScrollTask = nil
+        }
         .sheet(isPresented: self.$showSessions) {
             if self.showsSessionSwitcher {
                 ChatSessionsSheet(viewModel: self.viewModel)
@@ -180,6 +185,16 @@ public struct OpenClawChatView: View {
         }
         .onChange(of: self.viewModel.streamingAssistantText) { _, _ in
             guard self.hasPerformedInitialScroll, self.isPinnedToBottom else { return }
+            self.scheduleStreamingScrollToBottom()
+        }
+    }
+
+    private func scheduleStreamingScrollToBottom() {
+        guard self.pendingStreamingScrollTask == nil else { return }
+        self.pendingStreamingScrollTask = Task { @MainActor in
+            defer { self.pendingStreamingScrollTask = nil }
+            try? await Task.sleep(nanoseconds: 100_000_000)
+            guard !Task.isCancelled, self.hasPerformedInitialScroll, self.isPinnedToBottom else { return }
             withAnimation(.snappy(duration: 0.22)) {
                 self.scrollPosition = self.scrollerBottomID
             }

apps/shared/OpenClawKit/Tests/OpenClawKitTests/AssistantTextParserTests.swift

@@ -48,4 +48,13 @@ import Testing
         #expect(AssistantTextParser.hasVisibleContent(in: "<think>internal</think>") == false)
         #expect(AssistantTextParser.hasVisibleContent(in: "<think>internal</think>", includeThinking: true))
     }
+
+    @Test func usesStableSegmentIDsAcrossRepeatedStreamingParses() {
+        let raw = "<think>internal</think>\n\n<final>Hello there</final>"
+        let first = AssistantTextParser.segments(from: raw, includeThinking: true)
+        let second = AssistantTextParser.segments(from: raw, includeThinking: true)
+
+        #expect(first.map(\.id) == ["t0", "r1"])
+        #expect(first == second)
+    }
 }