Fix chat showing thinking shimmer instead of reconnecting state on reopen

When reopening a chat closed mid-session, the app was showing the
"Thinking…" shimmer instead of the reconnecting state. Two bugs:

1. reconnectToServiceLogs set status = .reconnecting then immediately
   overwrote it with status = .streaming before starting log replay,
   so the reconnecting state was never actually visible.

2. The ThinkingShimmerView condition only checked isStreaming, which
   returns true for .reconnecting, causing the shimmer to show with
   a misleading "Thinking…" label.

Fix: keep status = .reconnecting throughout log replay and suppress
the shimmer during reconnect, letting the status bar pill handle it.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mcintyre94

Wisp/ViewModels/ChatViewModel.swift

@@ -17,6 +17,11 @@ enum ChatStatus: Sendable {
         if case .connecting = self { return true }
         return false
     }
+
+    var isReconnecting: Bool {
+        if case .reconnecting = self { return true }
+        return false
+    }
 }
 
 struct AttachedFile: Identifiable {
@@ -994,7 +999,6 @@ final class ChatViewModel {
                 serviceName: serviceName
             )
 
-            status = .streaming
             let streamResult = await processServiceStream(
                 stream: stream,
                 modelContext: modelContext

Wisp/Views/SpriteDetail/Chat/ChatView.swift

@@ -36,7 +36,7 @@ struct ChatView: View {
                     ForEach(viewModel.messages) { message in
                         messageView(message)
                     }
-                    if viewModel.isStreaming && viewModel.pendingWispAskCard == nil {
+                    if viewModel.isStreaming && !viewModel.status.isReconnecting && viewModel.pendingWispAskCard == nil {
                         ThinkingShimmerView(label: viewModel.status.isConnecting ? "Connecting…" : (viewModel.activeToolLabel ?? "Thinking…"))
                             .transition(.opacity.combined(with: .move(edge: .bottom)))
                             .id("shimmer")