[No QA] fix: report warm inbox tab navigations correctly on web

[BartekObudzinski]

Explanation of Change

onLayout on the inbox sidebar hardcoded is_warm: false while the focus path hardcoded true. endSpan deletes the tracked span, so whichever fired first won. The attribute therefore reported which event arrived first rather than whether the screen had already been mounted.

On web that is always the layout path. The blurred tab pane is given display: none, and onLayout is driven by ResizeObserver, so returning to the tab fires it again on a screen that was never unmounted. Every warm return was reported as cold. On native react-freeze keeps the layout, onLayout does not fire again, and the focus path reports warm correctly.

Both paths now read the same ref, so the result no longer depends on ordering.

Warm share over the last 14 days (n=225,332): web desktop wide 0.12%, web desktop narrow 62.80%, native 44.58%. Same operating systems, flipping on wide_layout alone.

Verified in a browser on a wide window. A cold first mount reports is_warm: false at 681ms, and three returns report is_warm: true at 151ms, 140ms and 154ms on the same DOM node. Window resizes while sitting on the tab end no span, since none is in flight.

Expect the is_warm:false cohort to shrink and its p50 and p95 to rise, because the returns leaving it are four to six times cheaper than a real mount. That is the true first mount cost becoming visible, so re-baseline rather than reading it as a regression. Warm durations are not comparable across layouts either, roughly 20ms on narrow against 150ms on wide, and wide_layout separates them.

Related: #97966 already landed forceTransaction for this span.

Fixed Issues

$ #98051
PROPOSAL:

Tests

1. On a wide browser window, load the app fresh and land on the Inbox tab. In the console, confirm the ManualNavigateToInboxTab span logs is_warm: false.
2. Switch to another tab and back to Inbox. Confirm the span now logs is_warm: true.

• Verify that no errors appear in the JS console

Offline tests

N/A

QA Steps

N/A

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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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/hooks/useInboxTabSpanLifecycle.ts	100.00% <100.00%> (ø)
... and 40 files with indirect coverage changes

[mountiny]

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
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  • 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
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• I verified proper code patterns were followed (see Reviewing the code)
  • 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:
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• 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:
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• For any bug fix or new feature in this PR, I verified that sufficient unit tests are included to prevent regressions in this flow.
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Screenshots/Videos

Android: HybridApp

Android: mWeb Chrome

iOS: HybridApp

iOS: mWeb Safari

MacOS: Chrome / Safari

[melvin-bot]

@abdulrahuman5196 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]

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[github-actions]

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[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.

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🚀 Deployed to staging by https://github.com/mountiny in version: 9.4.52-0 🚀

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

[MelvinBot]

🤖 No help site changes required.

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

Why: This is a purely internal telemetry/instrumentation fix. It corrects how the is_warm attribute is reported on the internal ManualNavigateToInboxTab performance span in src/hooks/useInboxTabSpanLifecycle.ts. There is:

• No user-facing behavior change
• No new or changed feature, workflow, setting, tab, or button
• No change to billing, workspaces, integrations, or any documented product surface

The is_warm span attribute is an internal performance metric that never surfaces in the product UI, so there is nothing for a Guide or customer to read about — and therefore no help site article that needs to be created or edited.

Since no docs changes are required, I did not open a draft help site PR.

[OSBotify]

🚀 Deployed to production by https://github.com/roryabraham in version: 9.4.52-11 🚀

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

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