Add useCardFeeds regression tests for empty linkedPolicyIDs

[mountiny]

Explanation of Change

PR #88136 (merged earlier today) fixed the useCardFeeds include predicate so domain feeds whose linkedPolicyIDs is [] or [''] no longer get silently dropped, falling back to preferredPolicy / domainID matching as intended. That PR didn't add coverage in useCardFeeds.test.ts, so this PR pins the corrected behavior with regression tests against the exact onyx shape that triggered the customer issue.

• linkedPolicyIDs: [''] with matching preferredPolicy -> feed is included.
• linkedPolicyIDs: [] with matching preferredPolicy -> feed is included.
• linkedPolicyIDs: ['OTHER_POLICY'], current policyID not in the list -> feed is excluded (regression guard for non-empty linkedPolicyIDs semantics).
• linkedPolicyIDs: ['OTHER_POLICY', policyID] -> feed is included (multi-policy linkage).

I verified locally that all 4 new tests fail when the predicate is reverted to the pre-#88136 short-circuit version, and pass against main.

No production code is changed.

Fixed Issues

$ https://github.com/Expensify/Expensify/issues/548636
PROPOSAL:

Tests

1. Run `npx jest tests/unit/hooks/useCardFeeds.test.ts` locally.
2. Verify all 7 tests pass (3 existing + 4 new).
3. (Optional) Revert the predicate in `src/hooks/useCardFeeds.tsx` to:
   ```ts
   if (combinedCardFeed?.linkedPolicyIDs) {
   return combinedCardFeed.linkedPolicyIDs.includes(policyID);
   }
   ```
   and confirm the two new `includes domain feeds when linkedPolicyIDs ...` tests fail.

• Verify that no errors appear in the JS console

Offline tests

N/A - tests-only change.

QA Steps

N/A - tests-only change, no production code modified.

• Verify that no errors appear in the JS console

PR Author Checklist

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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[melvin-bot]

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