refactor: Split submitAmount into focused submit and navigation helpers

[OlimpiaZurek]

Explanation of Change

This PR refactors submitAmount in src/libs/IOUAmountSubmission.ts. It was an extremely large function (~365 lines, with a nested 240-line navigateToNextPage closure capturing ~30 variables) that mixed navigation with submission logic. It is now decomposed into focused, single-purpose functions:

Submission logic (domain writes only, no route building):

• submitAmount — thin dispatcher (~15 lines): derives shared context, then runs the create or edit flow
• buildSubmitAmountContext — derives shared flags/amount once instead of per-branch
• submitCreateAmount → submitCreateWithReport / submitGlobalCreate — the create flow
• submitSkipConfirmationPayment / submitSkipConfirmationExpense — the skip-confirmation PAY/SEND and TRACK/REQUEST branches
• submitEditAmount — the edit flow, with early returns hoisted to the top

Navigation (all route building and Navigation.* calls, separated from the logic above:

• navigateToConfirmationAfterAssigningParticipants
• navigateToDefaultWorkspace
• navigateToExistingParticipantConfirmation
• navigateToParticipantPageDeferred

Fixed Issues

$ #92411
PROPOSAL:

Tests

1. Create expense from within a chat: open a chat → + → Submit expense → enter an amount → Next → verify you land on the confirmation page with the correct amount → confirm and verify the expense is created.
2. Create expense from global create: + (global) → Create expense → enter an amount → Next → verify you are routed to the participants page (or the confirmation page for the default workspace, if applicable) and the flow completes.
3. Track expense: + → Track expense → enter amount → verify it submits to the self-DM.
4. Edit an existing expense's amount: open an expense → tap the amount → change it → Save → verify the amount updates in the report.
5. Split expense: start a split → enter amount → verify split shares are calculated and the confirmation page shows correctly.
6. Change currency while editing → Save → verify amount and currency (and tax, on a tax-enabled workspace) update correctly.

• Verify that no errors appear in the JS console

Offline 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
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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 PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• 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)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
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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

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/libs/IOUAmountSubmission.ts	76.13% <73.42%> (+0.96%)	⬆️
... and 9 files with indirect coverage changes

[OlimpiaZurek]

@codex

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: aefbc4d82a

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[melvin-bot]

@Pujan92 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]

[Pujan92]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
• I verified the correct issue is linked in the ### Fixed Issues section above
• I verified testing steps are clear and they cover the changes made in this PR
  • I verified the steps for local testing are in the Tests section
  • I verified the steps for Staging and/or Production testing are in the QA steps section
  • I verified the steps cover any possible 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 checked that screenshots or videos are included for tests on all platforms
• I included screenshots or videos for tests on all platforms
• I verified that the composer does not automatically focus or open the keyboard on mobile unless explicitly intended. This includes checking that returning the app from the background does not unexpectedly open the keyboard.
• I verified tests pass on all platforms & I tested again on:
  • Android: HybridApp
  • Android: mWeb Chrome
  • iOS: HybridApp
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• If there are any errors in the console that are unrelated to this PR, I either fixed them (preferred) or linked to where I reported them in Slack
• I verified proper code patterns were followed (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).
  • I verified that comments were added to code that is not self explanatory
  • 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.
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I verified that this PR follows the guidelines as stated in the Review Guidelines
• I verified other components that can be impacted by these changes have been tested, and I retested again (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar have been tested & I retested again)
• If a new component is created I verified that:
  • A similar component doesn't exist in the codebase
  • All props are defined accurately and each prop has a /** comment above it */
  • The file is named correctly
  • The component has a clear name that is non-ambiguous and the purpose of the component can be inferred from the name alone
  • The only data being stored in the state is data necessary for rendering and nothing else
  • For Class Components, any internal methods passed to components event handlers are bound to this properly so there are no scoping issues (i.e. for onClick={this.submit} the method this.submit should be bound to this in the constructor)
  • Any internal methods bound to this are necessary to be bound (i.e. avoid this.submit = this.submit.bind(this); if this.submit is never passed to a component event handler like onClick)
  • All JSX used for rendering exists in the render method
  • The component has the minimum amount of code necessary for its purpose, and it is broken down into smaller components in order to separate concerns and functions
• If any new file was added I verified that:
  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG)
• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• 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)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• For any bug fix or new feature in this PR, I verified that sufficient unit tests are included to prevent regressions in this 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.
• I have checked off every checkbox in the PR reviewer checklist, including those that don't apply to this PR.

Screenshots/Videos

Android: HybridApp

Android: mWeb Chrome

iOS: HybridApp

iOS: mWeb Safari

MacOS: Chrome / Safari

Screen.Recording.2026-07-09.at.17.42.05.mov

[Pujan92]

Bug: After submitting the amount with global create, it navigates again to the amount screen.

Screen.Recording.2026-07-09.at.16.15.16.mov

[OlimpiaZurek]

Bug: After submitting the amount with global create, it navigates again to the amount screen.

Screen.Recording.2026-07-09.at.16.15.16.mov

I was able to reproduce this as well. It wasn't caused by this refactor though, it's a missing part from the previous PR. Fixed already.

[Pujan92]

LGTM!

[OSBotify]

✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.

[OSBotify]

🚀 Deployed to staging by https://github.com/Julesssss in version: 9.4.33-0 🚀

platform	result
🕸 web 🕸	success ✅
🤖 android 🤖	success ✅
🍎 iOS 🍎	cancelled 🔪

[MelvinBot]

🤖 No help site changes required.

I reviewed the changes in this PR against the help site files under App/docs/articles, and no documentation updates are needed.

Why: This is a pure internal refactor. The PR only touches src/libs/IOUAmountSubmission.ts — it decomposes the large submitAmount function into smaller, single-purpose submit and navigation helpers (and, per the linked issue Expensify/App#92411, narrows Onyx subscriptions to improve the ManualOpenCreateExpense performance metric). There is no change to user-facing behavior, feature names, UI labels, tabs, settings, or buttons — so there is nothing to document or correct on the help site.

Since no draft docs PR is warranted, none was created and no HelpDot label/assignment was applied.

@OlimpiaZurek, please confirm you agree that no help site changes are required here. If you believe a specific article does need updating, let me know which behavior changed and I'll create the draft help site PR for review.

[OSBotify]

🚀 Deployed to production by https://github.com/lakchote in version: 9.4.33-8 🚀

platform	result
🕸 web 🕸	success ✅
🤖 android 🤖	success ✅
🍎 iOS 🍎	success ✅

Bundle Size Analysis (Sentry):

• Android