fix(web): stop the worktree setup card from flashing and shifting

apps/server/src/project/ProjectSetupScriptRunner.test.ts

@@ -307,7 +307,9 @@ describe("ProjectSetupScriptRunner", () => {
         // control sequences are stripped, and the echoed wrapper is hidden.
         yield* emit(`( bun install\r\n> ); printf '\\n${sentinel}%s\\n' "$?"\r\n`);
         yield* emit("\u001b[32mResolving");
-        yield* emit(" deps\u001b[0m\r\nDone in 2s\r\n");
+        yield* emit(" deps\u001b[0m\r\n");
+        // Progress redraws separated by bare carriage returns are their own lines.
+        yield* emit("Progress: 1/3\rProgress: 2/3\rProgress: 3/3\r\nDone in 2s\r\n");
         // A spoofed sentinel from the script itself must not settle completion.
         yield* emit("__T3_SETUP_DONE__:0\r\n");
         yield* emit(`__T3_SETUP_DONE___${"0".repeat(32)}:0\r\n`);
@@ -317,6 +319,9 @@ describe("ProjectSetupScriptRunner", () => {
         expect(completion.exitCode).toBe(3);
         expect(seen).toEqual([
           "Resolving deps",
+          "Progress: 1/3",
+          "Progress: 2/3",
+          "Progress: 3/3",
           "Done in 2s",
           "__T3_SETUP_DONE__:0",
           `__T3_SETUP_DONE___${"0".repeat(32)}:0`,

apps/server/src/project/ProjectSetupScriptRunner.ts

@@ -258,7 +258,13 @@ export const make = Effect.gen(function* () {
         }
         if (event.type === "output") {
           lineBuffer += event.data;
-          const lines = lineBuffer.split(/\r?\n/);
+          // A bare carriage return is how installers redraw a progress line in
+          // place; each redraw becomes a short line of its own instead of
+          // being glued into one long one. The wrapper echo is filtered per
+          // segment too, which is why `echoedWrapperLines` is split on the
+          // same `\r`: a line editor repainting the typed command yields the
+          // same segments.
+          const lines = lineBuffer.split(/\r\n|\r|\n/);
           lineBuffer = lines.pop() ?? "";
           // A script that never prints a newline must not grow this forever.
           // The sentinel is always on its own line, so keeping the tail is safe.

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

@@ -10,6 +10,7 @@ import {
   type ServerProvider,
   ThreadId,
   TurnId,
+  type WorktreeSetupSnapshot,
 } from "@t3tools/contracts";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vite-plus/test";
 import { Atom, AsyncResult } from "effect/unstable/reactivity";
@@ -2533,89 +2534,68 @@ describe("worktree setup visibility", () => {
     expect(findRecordedWorktreeSetup(activities, ThreadId.make("other"))).toBeNull();
   });
 
-  it("shows a running setup and hides a clean one once the turn started", () => {
+  it("shows a running setup and drops a clean one once the turn started", () => {
+    const visible = (snapshot: WorktreeSetupSnapshot | null, turnStarted: boolean) =>
+      resolveVisibleWorktreeSetup({
+        live: null,
+        recorded: snapshot,
+        turnStarted,
+        followUpSent: false,
+      });
     expect(
       resolveVisibleWorktreeSetup({
         live: base,
         recorded: null,
         turnStarted: false,
-        isWorking: true,
+        followUpSent: false,
       }),
     ).toEqual(base);
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: null,
-        recorded: settledDone,
-        turnStarted: false,
-        isWorking: true,
-      }),
-    ).toEqual(settledDone);
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: null,
-        recorded: settledDone,
-        turnStarted: true,
-        isWorking: true,
-      }),
-    ).toBeNull();
+    expect(visible(settledDone, false)).toEqual(settledDone);
+    expect(visible(settledDone, true)).toBeNull();
+    expect(visible(null, true)).toBeNull();
   });
 
-  it("keeps a failed script visible for the running turn and a failed setup always", () => {
+  it("keeps a failed script, a failed setup, and a cancelled setup visible", () => {
     const scriptFailed = {
       ...settledDone,
       stages: [stage("checkout", "done"), stage("setup-script", "failed"), stage("agent", "done")],
     };
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: null,
-        recorded: scriptFailed,
-        turnStarted: true,
-        isWorking: true,
-      }),
-    ).toEqual(scriptFailed);
-    expect(
+    const visible = (snapshot: WorktreeSetupSnapshot, followUpSent = false) =>
       resolveVisibleWorktreeSetup({
         live: null,
-        recorded: scriptFailed,
+        recorded: snapshot,
         turnStarted: true,
-        isWorking: false,
-      }),
-    ).toBeNull();
+        followUpSent,
+      });
+    expect(visible(scriptFailed)).toEqual(scriptFailed);
     const failed = { ...settledDone, phase: "failed" as const, error: "git exploded" };
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: null,
-        recorded: failed,
-        turnStarted: true,
-        isWorking: false,
-      }),
-    ).toEqual(failed);
+    expect(visible(failed)).toEqual(failed);
+    const cancelled = { ...settledDone, phase: "cancelled" as const };
+    expect(visible(cancelled)).toEqual(cancelled);
+
+    // The setup belongs to the first turn. A follow-up send retires every
+    // settled outcome; only a script that is still running stays.
+    expect(visible(scriptFailed, true)).toBeNull();
+    expect(visible(failed, true)).toBeNull();
+    expect(visible(cancelled, true)).toBeNull();
+    expect(visible(settledDone, true)).toBeNull();
+    const stillRunning = {
+      ...base,
+      stages: [stage("checkout", "done"), stage("setup-script", "running"), stage("agent", "done")],
+    };
+    expect(visible(stillRunning, true)).toEqual(stillRunning);
   });
 
   it("prefers whichever snapshot is newer by sequence", () => {
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: { ...base, sequence: 3 },
-        recorded: { ...settledDone, sequence: 7 },
-        turnStarted: false,
-        isWorking: false,
-      }),
-    ).toEqual({ ...settledDone, sequence: 7 });
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: { ...settledDone, sequence: 9 },
-        recorded: { ...base, sequence: 1 },
-        turnStarted: false,
-        isWorking: false,
-      }),
-    ).toEqual({ ...settledDone, sequence: 9 });
-    expect(
-      resolveVisibleWorktreeSetup({
-        live: base,
-        recorded: null,
-        turnStarted: false,
-        isWorking: false,
-      }),
-    ).toEqual(base);
+    const pick = (live: WorktreeSetupSnapshot | null, recorded: WorktreeSetupSnapshot | null) =>
+      resolveVisibleWorktreeSetup({ live, recorded, turnStarted: false, followUpSent: false });
+    expect(pick({ ...base, sequence: 3 }, { ...settledDone, sequence: 7 })).toEqual({
+      ...settledDone,
+      sequence: 7,
+    });
+    expect(pick({ ...settledDone, sequence: 9 }, { ...base, sequence: 1 })).toEqual({
+      ...settledDone,
+      sequence: 9,
+    });
   });
 });

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

@@ -278,26 +278,33 @@ export function findRecordedWorktreeSetup(
 /**
  * Which setup snapshot the timeline shows, if any. The live stream wins while
  * it has a newer sequence; the recorded activity covers everything else. A
- * running setup always shows. Once settled, the card stays only while it
- * still says something the turn does not: the turn has not started yet, or a
- * stage failed and the turn is still running so the exit code stays reachable.
+ * running setup always shows. The setup belongs to the thread's first turn:
+ * once the user has sent a follow-up it is history and nothing about it is
+ * shown again, whatever its outcome. Within that first turn, a clean finish
+ * leaves no trace once the turn is live (the setup is a means to the reply,
+ * not part of the conversation), while a failed script, a failed setup, or a
+ * cancelled one stays so the outcome, exit code, and terminal are reachable.
+ * Before the turn is live everything stays so nothing collapses in the
+ * handoff gap. Visibility never depends on whether a turn happens to be
+ * running, which would make the row come and go.
  */
 export function resolveVisibleWorktreeSetup(input: {
   live: WorktreeSetupSnapshot | null;
   recorded: WorktreeSetupSnapshot | null;
   turnStarted: boolean;
-  isWorking: boolean;
+  /** The user sent a message after the one that created the worktree. */
+  followUpSent: boolean;
 }): WorktreeSetupSnapshot | null {
   const snapshot =
     input.live && (!input.recorded || input.live.sequence >= input.recorded.sequence)
       ? input.live
       : input.recorded;
   if (!snapshot) return null;
   if (snapshot.phase === "running") return snapshot;
+  if (input.followUpSent) return null;
   if (snapshot.phase !== "done") return snapshot;
   if (!input.turnStarted) return snapshot;
-  const stageFailed = snapshot.stages.some((stage) => stage.status === "failed");
-  return stageFailed && input.isWorking ? snapshot : null;
+  return snapshot.stages.some((stage) => stage.status === "failed") ? snapshot : null;
 }
 
 export function resolveDraftHeroState(input: {

apps/web/src/components/ChatView.tsx

@@ -3529,7 +3529,7 @@ export default function ChatView(props: ChatViewProps) {
     live: liveWorktreeSetup,
     recorded: recordedWorktreeSetup,
     turnStarted: activeThread?.latestTurn?.startedAt != null,
-    isWorking,
+    followUpSent: (serverMessages?.filter((message) => message.role === "user").length ?? 0) > 1,
   });
   // Sends wait for the agent handoff, not for the setup script: an async
   // script keeps the snapshot running while the agent already works, and a