Fix lost/duplicated requests in PersistedRequests (Issues 2, 3, 4, 5) + deploy blocker fix

[szymonzalarski98]

Explanation of Change

This PR re-lands the sequential queue fixes from #84622 (which was reverted due to deploy blockers #85671, #85669, #85673, #85708, #85755) with additional fixes for the file upload regression.

Original fixes (Issues 2, 3, 4, 5):

• Issue 2: API.write() returned Promise.resolve() immediately — nothing in the write pipeline was awaited. Fix: save() returns Promise<void>, push() returns persistence promise, processRequest() awaits it.
• Issue 3: processNextRequest() and rollbackOngoingRequest() didn't persist changes to disk. Fix: both now use Onyx.multiSet() to atomically persist queue + ongoing request.
• Issue 4: Onyx connect callback blindly overwrote in-memory state with stale disk data. Fix: after initialization, callback returns early (in-memory is authoritative). Multi-tab support preserved via knownRequestIDs merge.
• Issue 5: Conflict resolver saw stale queue (consequence of Issue 4, fixed automatically).

Fixed Issues

$ #80759
PROPOSAL:

Tests

1. Upload an attachment in any chat → verify it uploads successfully, no error
2. Go to workspace settings → upload workspace avatar → Save → verify avatar updates
3. Create a manual expense with receipt → verify receipt is displayed
4. Go to workspace → Tags → Import → Multi-level tags → upload CSV → verify import succeeds
5. Open two browser tabs, create expense in tab 1, submit in tab 2 → verify it works
6. Go offline → create expenses → go online → verify all processed
7. Open DevTools console → repeat steps 1-4 → verify no DataCloneError

Offline tests

1. Go offline (DevTools → Network → Offline)
2. Create 3 expenses with receipts
3. Go back online
4. Verify all 3 expenses are created and receipts are displayed
5. Verify no duplicate or missing requests

QA Steps

1. Go to any chat → click attachment icon → upload a file → verify it uploads without error
2. Go to workspace settings → upload new avatar → Save → verify avatar changes
3. Create manual expense → attach receipt → verify receipt is displayed
4. Go to workspace → Tags → Import → Multi-level tags → upload CSV → verify import succeeds
5. Open two tabs → create expense in tab 1 → submit in tab 2 → verify it works
6. Go offline → create 2-3 expenses → go online → verify all processed
7. Open DevTools console → repeat steps 1-4 → verify no errors

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 cxorrect)
  • 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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• 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

Nagranie.z.ekranu.2026-03-19.o.12.04.39.mov

Nagranie.z.ekranu.2026-03-19.o.11.58.50.mov

Nagranie.z.ekranu.2026-03-19.o.11.57.40.mov

[melvin-bot]

@thesahindia 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]

[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/API/index.ts	92.78% <100.00%> (ø)
src/libs/Network/SequentialQueue.ts	86.61% <91.66%> (+0.05%)	⬆️
src/libs/actions/PersistedRequests.ts	76.82% <65.78%> (-8.28%)	⬇️
... and 34 files with indirect coverage changes

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