fix(chat): improve history + polish SwiftUI panel

apps/macos/Sources/Clawdis/GatewayChannel.swift

@@ -43,7 +43,10 @@ protocol WebSocketSessioning: AnyObject {
 
 extension URLSession: WebSocketSessioning {
     func makeWebSocketTask(url: URL) -> WebSocketTaskBox {
-        WebSocketTaskBox(task: self.webSocketTask(with: url))
+        let task = self.webSocketTask(with: url)
+        // Avoid "Message too long" receive errors for large snapshots / history payloads.
+        task.maximumMessageSize = 16 * 1024 * 1024 // 16 MB
+        return WebSocketTaskBox(task: task)
     }
 }
 

apps/macos/Sources/Clawdis/WebChatSwiftUI.swift

@@ -72,35 +72,8 @@ struct MacGatewayChatTransport: ClawdisChatTransport, Sendable {
                 let stream = await GatewayConnection.shared.subscribe()
                 for await push in stream {
                     if Task.isCancelled { return }
-                    switch push {
+                    if let evt = Self.mapPushToTransportEvent(push) {
-                    case let .snapshot(hello):
+                        continuation.yield(evt)
-                        let ok = (try? JSONDecoder().decode(
-                            ClawdisGatewayHealthOK.self,
-                            from: JSONEncoder().encode(hello.snapshot.health)))?.ok ?? true
-                        continuation.yield(.health(ok: ok))
-                    case let .event(evt):
-                        switch evt.event {
-                        case "health":
-                            guard let payload = evt.payload else { break }
-                            let ok = (try? JSONDecoder().decode(
-                                ClawdisGatewayHealthOK.self,
-                                from: JSONEncoder().encode(payload)))?.ok ?? true
-                            continuation.yield(.health(ok: ok))
-                        case "tick":
-                            continuation.yield(.tick)
-                        case "chat":
-                            guard let payload = evt.payload else { break }
-                            if let chat = try? JSONDecoder().decode(
-                                ClawdisChatEventPayload.self,
-                                from: JSONEncoder().encode(payload))
-                            {
-                                continuation.yield(.chat(chat))
-                            }
-                        default:
-                            break
-                        }
-                    case .seqGap:
-                        continuation.yield(.seqGap)
                     }
                 }
             }
@@ -110,6 +83,42 @@ struct MacGatewayChatTransport: ClawdisChatTransport, Sendable {
             }
         }
     }
+
+    static func mapPushToTransportEvent(_ push: GatewayPush) -> ClawdisChatTransportEvent? {
+        switch push {
+        case let .snapshot(hello):
+            let ok = (try? JSONDecoder().decode(
+                ClawdisGatewayHealthOK.self,
+                from: JSONEncoder().encode(hello.snapshot.health)))?.ok ?? true
+            return .health(ok: ok)
+
+        case let .event(evt):
+            switch evt.event {
+            case "health":
+                guard let payload = evt.payload else { return nil }
+                let ok = (try? JSONDecoder().decode(
+                    ClawdisGatewayHealthOK.self,
+                    from: JSONEncoder().encode(payload)))?.ok ?? true
+                return .health(ok: ok)
+            case "tick":
+                return .tick
+            case "chat":
+                guard let payload = evt.payload else { return nil }
+                guard let chat = try? JSONDecoder().decode(
+                    ClawdisChatEventPayload.self,
+                    from: JSONEncoder().encode(payload))
+                else {
+                    return nil
+                }
+                return .chat(chat)
+            default:
+                return nil
+            }
+
+        case .seqGap:
+            return .seqGap
+        }
+    }
 }
 
 // MARK: - Window controller
@@ -124,11 +133,19 @@ final class WebChatSwiftUIWindowController {
     var onClosed: (() -> Void)?
     var onVisibilityChanged: ((Bool) -> Void)?
 
-    init(sessionKey: String, presentation: WebChatPresentation) {
+    convenience init(sessionKey: String, presentation: WebChatPresentation) {
+        self.init(sessionKey: sessionKey, presentation: presentation, transport: MacGatewayChatTransport())
+    }
+
+    init(sessionKey: String, presentation: WebChatPresentation, transport: any ClawdisChatTransport) {
         self.sessionKey = sessionKey
         self.presentation = presentation
-        let vm = ClawdisChatViewModel(sessionKey: sessionKey, transport: MacGatewayChatTransport())
+        let vm = ClawdisChatViewModel(sessionKey: sessionKey, transport: transport)
         self.hosting = NSHostingController(rootView: ClawdisChatView(viewModel: vm))
+        self.hosting.view.wantsLayer = true
+        self.hosting.view.layer?.cornerCurve = .continuous
+        self.hosting.view.layer?.cornerRadius = 16
+        self.hosting.view.layer?.masksToBounds = true
         self.window = Self.makeWindow(for: presentation, contentViewController: self.hosting)
     }
 

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatView.swift

@@ -23,16 +23,6 @@ public struct ClawdisChatView: View {
             .padding(.vertical, 16)
             .frame(maxWidth: 1040)
         }
-        .background(
-            LinearGradient(
-                colors: [
-                    Color(red: 0.96, green: 0.97, blue: 1.0),
-                    Color(red: 0.93, green: 0.94, blue: 0.98),
-                ],
-                startPoint: .top,
-                endPoint: .bottom)
-                .opacity(0.35)
-                .ignoresSafeArea())
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
         .onAppear { self.viewModel.load() }
     }

src/gateway/protocol/schema.ts

@@ -458,6 +458,7 @@ export const CronRunLogEntrySchema = Type.Object(
 export const ChatHistoryParamsSchema = Type.Object(
   {
     sessionKey: NonEmptyString,
+    limit: Type.Optional(Type.Integer({ minimum: 1, maximum: 500 })),
   },
   { additionalProperties: false },
 );

src/gateway/server.ts

@@ -793,13 +793,19 @@ export async function startGatewayServer(
               },
             };
           }
-          const { sessionKey } = params as { sessionKey: string };
+          const { sessionKey, limit } = params as {
+            sessionKey: string;
+            limit?: number;
+          };
           const { storePath, entry } = loadSessionEntry(sessionKey);
           const sessionId = entry?.sessionId;
-          const messages =
+          const rawMessages =
             sessionId && storePath
               ? readSessionMessages(sessionId, storePath)
               : [];
+          const max = typeof limit === "number" ? limit : 200;
+          const messages =
+            rawMessages.length > max ? rawMessages.slice(-max) : rawMessages;
           const thinkingLevel =
             entry?.thinkingLevel ??
             loadConfig().inbound?.reply?.thinkingDefault ??