fix(web): deleted answer chips no longer return after picking an option

apps/web/src/components/chat/usePendingThreadRequests.ts

@@ -37,6 +37,7 @@ import {
   pendingUserInputRequestKey,
   pruneResolvedUserInputDrafts,
   setPendingUserInputCustomAnswer,
+  threadContextsReferencedByAnswer,
   togglePendingUserInputOptionSelection,
   type PendingUserInputDraftAnswer,
 } from "../../pendingUserInput";
@@ -452,7 +453,10 @@ export function usePendingThreadRequests(input: {
         );
         store.addThreadContexts(
           composerDraftTarget,
-          store.getComposerDraft(questionTarget)?.threadContexts ?? [],
+          threadContextsReferencedByAnswer(
+            displacedAnswer ?? "",
+            store.getComposerDraft(questionTarget)?.threadContexts ?? [],
+          ),
           { appendReference: false },
         );
       }

apps/web/src/pendingUserInput.test.ts

@@ -12,6 +12,7 @@ import {
   projectPendingUserInputAnswer,
   resolvePendingUserInputAnswer,
   setPendingUserInputCustomAnswer,
+  threadContextsReferencedByAnswer,
   togglePendingUserInputOptionSelection,
 } from "./pendingUserInput";
 
@@ -42,6 +43,22 @@ describe("projectPendingUserInputAnswer", () => {
   });
 });
 
+describe("threadContextsReferencedByAnswer", () => {
+  const kept = threadContextRecord(
+    { environmentId: EnvironmentId.make("env-answer"), threadId: ThreadId.make("kept-thread") },
+    "Kept work",
+  );
+  const deleted = threadContextRecord(
+    { environmentId: EnvironmentId.make("env-answer"), threadId: ThreadId.make("deleted-thread") },
+    "Deleted work",
+  );
+
+  it("preserves remaining chips without restoring deleted thread records", () => {
+    const answer = `Compare ${formatInlineContextReference(threadContextReference(kept))}`;
+    expect(threadContextsReferencedByAnswer(answer, [deleted, kept])).toEqual([kept]);
+  });
+});
+
 const singleSelectQuestion = {
   id: "scope",
   header: "Scope",

apps/web/src/pendingUserInput.ts

@@ -2,6 +2,8 @@ import type { ThreadContextRecord, UserInputQuestion } from "@t3tools/contracts"
 import { replaceComposerContextReferences } from "@t3tools/shared/composerContextReferences";
 import { formatThreadLink } from "@t3tools/shared/threadLinks";
 
+import { collectInlineContextIds } from "./lib/composerContextReferences";
+
 export function projectPendingUserInputAnswer(
   answer: unknown,
   threadContexts: ReadonlyArray<ThreadContextRecord>,
@@ -14,6 +16,15 @@ export function projectPendingUserInputAnswer(
   });
 }
 
+// Question drafts retain deleted chip records for undo; only transfer referenced records.
+export function threadContextsReferencedByAnswer(
+  answer: string,
+  threadContexts: ReadonlyArray<ThreadContextRecord>,
+) {
+  const referencedIds = new Set(collectInlineContextIds(answer));
+  return threadContexts.filter((record) => referencedIds.has(record.contextId));
+}
+
 export interface PendingUserInputDraftAnswer {
   selectedOptionValues?: string[];
   customAnswer?: string;