fix(test): use groups not legacy role in recommendations-lookback mockUser (closes #935)

[cristim]

closes #935

Summary

• mockUser in recommendations-lookback.test.ts was still using the pre-feat(auth): /api/auth/me/permissions endpoint + wire frontend canAccess (lift non-admin UI lockout) #917 legacy role field
• After the group-membership authz migration (feat(auth): group-membership-only authorization, remove roles, require >=1 group (closes #907) #912/feat(auth): /api/auth/me/permissions endpoint + wire frontend canAccess (lift non-admin UI lockout) #917), isAdmin() reads user.groups, so the old fixture always yielded canEdit === false, the lookback change listener was never attached, and 11 tests failed on the base branch
• Added import of ADMINISTRATORS_GROUP_ID from ../permissions and switched mockUser to set groups: [ADMINISTRATORS_GROUP_ID] for admin, groups: [] for non-admin roles -- mirrors the pattern in recommendations-permissions.test.ts

Test plan

• Before fix: npm test -- recommendations-lookback shows 11 failed, 6 passed
• After fix: npm test -- recommendations-lookback shows 17 passed, 0 failed
• npm run build succeeds with no errors

[coderabbitai]

Warning

Review limit reached

@cristim, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 5 minutes and 19 seconds. Learn how PR review limits work.

Your organization has run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 43879d13-fa7e-427f-9d07-12f3a35b8395

📥 Commits

Reviewing files that changed from the base of the PR and between eb85a50 and c09dc4d.

📒 Files selected for processing (1)

• frontend/src/__tests__/recommendations-lookback.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/935-lookback-test-groups

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[cristim]

@coderabbitai review

[coderabbitai]

✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.