Remove the "Answered in" duration footer from Slack assistant replies (#25237)

Removes the "Answered in {x}s" footer the Slack assistant appended to
every answer.

## What changed

- `build-slack-assistant-answer-blocks.ts`: dropped the "Answered in
{x}s" context block, so rich replies are now the markdown body plus the
feedback buttons.
- Plain-text replies (the fallback for answers too long for a markdown
block): the worker posts `responseText` directly.
`build-slack-assistant-answer-text.ts`, which only existed to append the
footer, is deleted along with its test.
- `format-slack-assistant-duration.ts` deleted (no remaining users); the
worker no longer tracks `startedAt`/`durationMilliseconds`.
- Tests updated to the new block layout.

`strip-slack-assistant-answer-footer.ts` is deliberately kept: it strips
the footer from the bot's own earlier messages when replaying thread
history into the agent context, and still-live threads contain footered
messages posted by previous versions. Its comment now explains that.

## Validation

- `yarn typecheck` clean
- `yarn lint` 0 warnings / 0 errors
- `yarn test:unit` 193 tests pass (2 fewer than before: the deleted
footer tests)

---
_Generated by [Claude
Code](https://claude.ai/code/session_01UYyiPFprpyCDwhb1J3mCkU)_

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Author: abdulrahmancodes

packages/twenty-apps/public/slack/src/__tests__/slack-assistant-worker.integration-test.ts

@@ -218,12 +218,6 @@ describe('Slack assistant worker', () => {
 
     expect(postedAnswer?.blocks).toEqual([
       { type: 'markdown', text: 'Acme has 3 open deals.' },
-      {
-        type: 'context',
-        elements: [
-          { type: 'mrkdwn', text: expect.stringMatching(/^Answered in \d+s$/) },
-        ],
-      },
       // The feedback buttons carry the request record id, which is how a click
       // finds the answer it rates.
       expect.objectContaining({

packages/twenty-apps/public/slack/src/logic-functions/slack-assistant-worker.ts

@@ -17,7 +17,6 @@ import { updateSlackAssistantRequest } from 'src/logic-functions/data/update-sla
 import { slackPostMessageHandler } from 'src/logic-functions/handlers/slack-post-message-handler';
 import { type SlackAssistantRequestRecord } from 'src/logic-functions/types/slack-assistant-request-record.type';
 import { buildSlackAssistantAnswerBlocks } from 'src/logic-functions/utils/build-slack-assistant-answer-blocks';
-import { buildSlackAssistantAnswerText } from 'src/logic-functions/utils/build-slack-assistant-answer-text';
 import { buildSlackAssistantMessages } from 'src/logic-functions/utils/build-slack-assistant-messages';
 import { buildSlackAssistantRequestName } from 'src/logic-functions/utils/build-slack-assistant-request-name';
 import { extractAgentResponseText } from 'src/logic-functions/utils/extract-agent-response-text';
@@ -39,7 +38,6 @@ type SlackAssistantRequestCreatedEvent = DatabaseEventPayload<
 export const slackAssistantWorkerHandler = async (
   event: SlackAssistantRequestCreatedEvent,
 ): Promise<object> => {
-  const startedAt = Date.now();
   const record = event.properties.after;
 
   if (record.status !== SLACK_ASSISTANT_REQUEST_STATUS.PENDING) {
@@ -152,14 +150,9 @@ export const slackAssistantWorkerHandler = async (
       });
     }
 
-    const durationMilliseconds = Date.now() - startedAt;
-
     const deliveryResult = await slackPostMessageHandler({
       slackChannelId,
-      messageText: buildSlackAssistantAnswerText({
-        responseText,
-        durationMilliseconds,
-      }),
+      messageText: responseText,
       parentMessageTimestamp,
       messageFormat: 'markdown',
       unfurlLinks: false,
@@ -169,7 +162,6 @@ export const slackAssistantWorkerHandler = async (
           ? undefined
           : buildSlackAssistantAnswerBlocks({
               responseText,
-              durationMilliseconds,
               requestId: record.id,
             }),
     });

packages/twenty-apps/public/slack/src/logic-functions/utils/__tests__/build-slack-assistant-answer-blocks.test.ts

@@ -5,19 +5,14 @@ import { buildSlackAssistantAnswerBlocks } from 'src/logic-functions/utils/build
 const REQUEST_ID = '3f77d0b1-30a1-4c3d-9d02-2f2a9f6f9d10';
 
 describe('buildSlackAssistantAnswerBlocks', () => {
-  it('should render the answer as a markdown block followed by a duration footer and feedback buttons', () => {
+  it('should render the answer as a markdown block followed by feedback buttons', () => {
     expect(
       buildSlackAssistantAnswerBlocks({
         responseText: 'All done.',
-        durationMilliseconds: 3000,
         requestId: REQUEST_ID,
       }),
     ).toEqual([
       { type: 'markdown', text: 'All done.' },
-      {
-        type: 'context',
-        elements: [{ type: 'mrkdwn', text: 'Answered in 3s' }],
-      },
       {
         type: 'context_actions',
         block_id: REQUEST_ID,
@@ -49,7 +44,6 @@ describe('buildSlackAssistantAnswerBlocks', () => {
 
     const [markdownBlock] = buildSlackAssistantAnswerBlocks({
       responseText,
-      durationMilliseconds: 1000,
       requestId: REQUEST_ID,
     });
 

packages/twenty-apps/public/slack/src/logic-functions/utils/__tests__/build-slack-assistant-answer-text.test.ts

@@ -2,27 +2,15 @@ import { type KnownBlock } from '@slack/web-api';
 
 import { SLACK_ASSISTANT_FEEDBACK_ACTION_ID } from 'src/logic-functions/constants/slack-assistant-feedback-action-id';
 import { SLACK_ASSISTANT_FEEDBACK_BUTTON_VALUE } from 'src/logic-functions/constants/slack-assistant-feedback-button-value';
-import { formatSlackAssistantDuration } from 'src/logic-functions/utils/format-slack-assistant-duration';
 
 export const buildSlackAssistantAnswerBlocks = ({
   responseText,
-  durationMilliseconds,
   requestId,
 }: {
   responseText: string;
-  durationMilliseconds: number;
   requestId: string;
 }): KnownBlock[] => [
   { type: 'markdown', text: responseText },
-  {
-    type: 'context',
-    elements: [
-      {
-        type: 'mrkdwn',
-        text: `Answered in ${formatSlackAssistantDuration(durationMilliseconds)}`,
-      },
-    ],
-  },
   {
     type: 'context_actions',
     block_id: requestId,

packages/twenty-apps/public/slack/src/logic-functions/utils/build-slack-assistant-answer-blocks.ts

@@ -1,4 +1,5 @@
-// mirrors the footer appended by buildSlackAssistantAnswerText
+// older versions of the bot appended this footer to every answer; still-live
+// threads carry those messages, so replayed history keeps needing the strip
 const ANSWER_FOOTER_PATTERN = /\n\n_Answered in [^\n_]+_$/;
 
 export const stripSlackAssistantAnswerFooter = (text: string): string =>