Fix: land onboarding Track-business users on Home instead of Inbox

[marcochavezf]

Explanation of Change

After onboarding with "Track expenses for my business", some users landed on the empty Inbox instead of Home. The guard at the onboarding call sites used isReportTopmostSplitNavigator(), which only checks whether the Reports tab is topmost, not whether it actually shows a report. When a fresh onboarding user's base tab happened to be the empty Inbox, the guard treated that as a report worth preserving, skipped Navigation.navigate(ROUTES.HOME), and left the user stranded on Inbox. The outcome was intermittent because it depended on which tab was the base of the tab navigator when onboarding started.

This PR adds isReportRevealedInTopmostSplitNavigator() in src/libs/Navigation/helpers/, which also requires a SCREENS.REPORT route in the split's inner routes before treating it as revealed. It replaces the guard at both call sites in RHPVariantTest/index.ts and at the fallback gate in navigateAfterOnboarding.ts. isReportTopmostSplitNavigator is left untouched, since the IOU flows and SignInModal still call it directly for unrelated checks.

Fixed Issues

$ https://github.com/Expensify/Expensify/issues/663126
PROPOSAL: https://github.com/Expensify/Expensify/issues/663126#issuecomment-5074382682

Tests

1. Sign in as a new user and start onboarding.
2. Select "Track expenses for my business" and complete onboarding.
3. Verify you land on Home, not the empty Inbox. Repeat a few times, since the original bug was intermittent and depended on which tab was the base of the split navigator when onboarding started.
4. Deep-link into an existing report before starting onboarding, complete the same onboarding flow, and verify that report is still shown instead of being replaced by Home. Repeat on both a small and a large screen.

New automated regression tests cover the same two scenarios: tests/unit/components/SidePanel/RHPVariantTest.test.ts and tests/unit/navigateAfterOnboardingTest.ts each gained a case asserting that an onboarding user whose Reports tab shows only the empty Inbox sidebar still lands on Home, alongside the existing cases that a genuinely revealed report is preserved.

• Verify that no errors appear in the JS console

Offline tests

N/A. This change only affects which route onboarding navigates to, and it reads navigation state that is already local.

QA Steps

1. On staging, create a new account and go through onboarding.
2. Select "Track expenses for my business" and complete onboarding.
3. Verify you land on the Home tab, not an empty Inbox. Repeat a few times, since the original bug appeared intermittently.
4. Open an existing report via a deep link, then start a new onboarding flow and complete it. Verify the deep-linked report stays open instead of being replaced by Home.

• 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)
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• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
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  • A similar style doesn't already exist
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  • The assets load correctly across all supported platforms.
• 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.
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• 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:
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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

[codecov]

Codecov Report

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

Files with missing lines	Coverage Δ
src/components/SidePanel/RHPVariantTest/index.ts	51.51% <100.00%> (ø)
src/libs/navigateAfterOnboarding.ts	88.00% <100.00%> (ø)
...helpers/isReportRevealedInTopmostSplitNavigator.ts	66.66% <66.66%> (ø)
... and 12 files with indirect coverage changes