Fix IOU avatar combined when manual and scan expenses from same user

[MelvinBot]

Explanation of Change

When a user sends both a manual expense and a scan expense in a 1:1 chat, the IOU avatar incorrectly shows both users instead of just the sender. This happens because scan-in-progress expenses have amount=0, and Math.sign(0)=0 creates a distinct value in the sign comparison set, making areAmountsSignsTheSame=false.

This PR fixes the sender detection logic in useReportPreviewSenderID with a two-tier approach:

1. Primary path: When iouActions are available, use actorAccountID to determine if all transactions were created by the same user (most reliable).
2. Fallback path: When iouActions aren't loaded yet, use the sign-based check but with scan-awareness — scan-in-progress transactions with no usable amount are excluded from the comparison rather than contributing Math.sign(0)=0.

Fixed Issues

$ #82488
PROPOSAL: #82488 (comment)

Tests

1. Sign in to New Dot as User A
2. Create a chat with User B
3. Send a manual expense to User B — verify the IOU preview shows only User A's avatar
4. Send a scan expense (upload a receipt) in the same chat
5. Verify the IOU preview still shows only User A's avatar (not both users)
6. Wait for SmartScan to complete — verify avatar still shows correctly

• Verify that no errors appear in the JS console

Offline tests

Offline behavior is not directly affected. The fix improves avatar display when iouActions are not yet loaded (which can happen offline or on first login). When offline, the fallback sign-based path handles scan transactions gracefully by excluding zero-amount scans from the comparison.

QA Steps

1. Sign in to staging as User A
2. Create a 1:1 chat with User B
3. Send a manual expense to User B
4. Send a scan expense (upload a receipt) in the same chat
5. Verify the IOU report preview shows only User A's avatar, not both users' avatars
6. Also verify that when both User A and User B send expenses to each other, both avatars are shown

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
• I followed proper code patterns (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
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    • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
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• I verified that if a function's arguments changed that all usages have also been updated correctly
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• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[MelvinBot]

Fixed the failing ESLint check: the test file used CONST.IOU.RECEIPT_STATE.SCANREADY but the correct constant key is SCAN_READY (with underscore). This caused a @typescript-eslint/no-unsafe-assignment error since the non-existent property resolved to an error type.

[MelvinBot]

The previous check failures (ESLint + TypeScript) in tests/unit/useReportPreviewSenderIDTest.ts were caused by using SCANREADY instead of SCAN_READY. This was already fixed in commit 6ad4883. The current CI run shows all completed checks passing — remaining checks (typecheck, tests) are still pending and should pass now.

[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
...ts/ReportActionAvatars/useReportPreviewSenderID.ts	90.74% <81.25%> (-4.26%)	⬇️
... and 13 files with indirect coverage changes

[aimane-chnaif]

@MelvinBot close this PR

[MelvinBot]

Closed this PR as requested by aimane-chnaif.