Remove stale 'preparing-worktree' send phase

Worktree preparation now happens server-side as part of the bootstrap
payload, so the client-side 'preparing-worktree' phase no longer
corresponds to any actual work. Between setting it and transitioning to
'sending-turn', async operations (auto-title, persistThreadSettings)
could run, leaving a misleading 'Preparing worktree...' indicator in
the UI.

Remove the phase entirely: always begin with 'sending-turn', drop the
isPreparingWorktree derived flag and its UI references.

Author: cursoragent

apps/web/src/components/ChatView.logic.ts

@@ -75,7 +75,7 @@ export function collectUserMessageBlobPreviewUrls(message: ChatMessage): string[
   return previewUrls;
 }
 
-export type SendPhase = "idle" | "preparing-worktree" | "sending-turn";
+export type SendPhase = "idle" | "sending-turn";
 
 export interface PullRequestDialogState {
   initialReference: string | null;

apps/web/src/components/ChatView.tsx

@@ -658,7 +658,6 @@ export default function ChatView({ threadId }: ChatViewProps) {
   const selectedModelForPicker = selectedModel;
   const phase = derivePhase(activeThread?.session ?? null);
   const isSendBusy = sendPhase !== "idle";
-  const isPreparingWorktree = sendPhase === "preparing-worktree";
   const isWorking = phase === "running" || isSendBusy || isConnecting || isRevertingCheckpoint;
   const nowIso = new Date(nowTick).toISOString();
   const activeWorkStartedAt = deriveActiveWorkStartedAt(
@@ -2573,7 +2572,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
     }
 
     sendInFlightRef.current = true;
-    beginSendPhase(baseBranchForWorktree ? "preparing-worktree" : "sending-turn");
+    beginSendPhase("sending-turn");
 
     const composerImagesSnapshot = [...composerImages];
     const composerTerminalContextsSnapshot = [...sendableComposerTerminalContexts];
@@ -4006,11 +4005,6 @@ export default function ChatView({ threadId }: ChatViewProps) {
                         {activeContextWindow ? (
                           <ContextWindowMeter usage={activeContextWindow} />
                         ) : null}
-                        {isPreparingWorktree ? (
-                          <span className="text-muted-foreground/70 text-xs">
-                            Preparing worktree...
-                          </span>
-                        ) : null}
                         {activePendingProgress ? (
                           <div className="flex items-center gap-2">
                             {activePendingProgress.questionIndex > 0 ? (
@@ -4115,11 +4109,9 @@ export default function ChatView({ threadId }: ChatViewProps) {
                               aria-label={
                                 isConnecting
                                   ? "Connecting"
-                                  : isPreparingWorktree
-                                    ? "Preparing worktree"
-                                    : isSendBusy
-                                      ? "Sending"
-                                      : "Send message"
+                                  : isSendBusy
+                                    ? "Sending"
+                                    : "Send message"
                               }
                             >
                               {isConnecting || isSendBusy ? (