[iOS] Fix crash after inviting a user to a group chat

[marufsharifi]

Explanation of Change

This change makes the group members' screens more stable right after inviting someone new. Instead of piecing together member states from several sources that can briefly disagree, it now relies on a single, pre-derived participant model. That removes the timing gap that could cause the iOS crash after inviting a new user to a group chat.

It also makes the member list behave more predictably during invite and removal transitions. Pending deletions, optimistic users, roles, and disabled states are now determined once before rendering, so the screen shows a cleaner, more reliable view of who is actually in the chat at that moment.

Fixed Issues

$ #78097
PROPOSAL: #78097 (comment)

Tests

1. Create a group chat
2. Tap on the group chat header
3. Tap on the Members > Invite member
4. Enter an email of the user who doesn't have an account
5. Tap the Invite button
6. Verify that the user is redirected to the member's page

• Verify that no errors appear in the JS console

Offline tests

Same as Tests.

QA Steps

Same as Tests.

// TODO: These must be filled out, or the issue title must include "[No QA]."

• 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)
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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 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

REC-20260406100511.PM.mp4

Android: mWeb Chrome

REC-2026040695040.PM.mp4

iOS: Native

REC-2026040692851.PM.mp4

iOS: mWeb Safari

REC-2026040693654.PM.mp4

MacOS: Chrome / Safari

REC-2026040691821.PM.mp4

[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
src/libs/ReportUtils.ts	79.77% <26.66%> (-0.17%)	⬇️
src/pages/ReportParticipantsPage.tsx	0.00% <0.00%> (ø)
... and 19 files with indirect coverage changes

[melvin-bot]

@eVoloshchak Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[joekaufmanexpensify]

Good for product