Restore slight fade-in for centered alert modals on web

[adhorodyski]

Explanation of Change

PR #90212 ("Tune web modal, dropdown and RHP animations") reduced all web modal open/close timings to 1ms via platform-keyed DEFAULT_IN/DEFAULT_OUT constants. @shawnborton noted in review feedback that centered alert modals felt too abrupt and requested a slight fade-in.

This PR adds per-type timing overrides for centered modal variants on web only:

• CONST.MODAL.ANIMATION_TIMING.CENTERED_DURATION_IN_WEB: 120 and CENTERED_DURATION_OUT_WEB: 80 are added alongside the existing RHP_DURATION_*_WEB constants.
• src/components/Modal/index.tsx (web entry point) detects when type is CONFIRM, CENTERED, CENTERED_UNSWIPEABLE, CENTERED_SMALL, or CENTERED_SWIPEABLE_TO_RIGHT and applies these timings as defaults — caller-provided animationInTiming/animationOutTiming still take precedence.
• No new keyframes or easing changes; the existing fadeIn/fadeOut animations are reused.
• Native (iOS/Android) is entirely untouched — the web index.tsx entry point is not used on those platforms.

Fixed Issues

$ #90146
PROPOSAL:

Tests

• Go to account -> troubleshoot.
• Click 'Clear cache and restart'.
• Verify the center modal opens not spontaneously and has a slight animation.

Offline tests

N/A

QA Steps

Same as tests

• 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)
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  • iOS: Native
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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.
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  • 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/CONST/index.ts	93.84% <ø> (ø)
src/components/Modal/index.tsx	0.00% <0.00%> (ø)
... and 6 files with indirect coverage changes

[github-actions]

🚧 @shawnborton has triggered a test Expensify/App build. You can view the workflow run here.

[melvin-bot]

@huult 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]

[ChavdaSachin]

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 shown in the product is localized by adding it to src/languages/* files and using the translation method
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
  • 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)
  • I verified proper file naming conventions were followed for any new files or renamed files. All non-platform specific files are named after what they export and are not named "index.js". All platform-specific files are named for the platform the code supports as outlined in the README.
  • I verified the JSDocs style guidelines (in STYLE.md) were followed
• 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)
• I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
• I verified any variables that can be defined as constants (ie. in CONST.ts or at the top of the file that uses the constant) are defined as such
• 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 */
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  • 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.
• If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
• 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

Screen.Recording.2026-05-27.at.10.46.26.PM.mov

Android: mWeb Chrome

iOS: HybridApp

Screen.Recording.2026-05-27.at.10.42.47.PM.mov

iOS: mWeb Safari

MacOS: Chrome / Safari

Screen.Recording.2026-05-26.155208.mp4

[huult]

@ChavdaSachin Are you assigned to review this feature?

[shawnborton]

Feels great to me, send it 🚀

[ChavdaSachin]

@ChavdaSachin Are you assigned to review this feature?

No one is assigned to the feature,
Damnn Melvin assigned two of us C+ here.

[huult]

No one is assigned to the feature,
Damnn Melvin assigned two of us C+ here.

@ChavdaSachin You were assigned after me. @Julesssss, who will review this PR?

[dannymcclain]

Feels good to me too! #sendddddddd-ittttttt

[Julesssss]

Damnn Melvin assigned two of us C+ here.

@ChavdaSachin You were assigned after me. @Julesssss, who will review this PR?

We will stick with @ChavdaSachin as they have completed the checklist and captures

[Julesssss]

@ChavdaSachin could you please continue with the review, thank you

[ChavdaSachin]

LGTM! ✅

[ChavdaSachin]

Test for QA:
Tests are only for the wide-screen interface.

1. Go to account -> troubleshoot.
2. Click 'Clear cache and restart'.
3. Verify the center modal opens not spontaneously and has a slight animation.

[Julesssss]

Added test cases to description, thanks!

[github-actions]

🚧 @Julesssss has triggered a test Expensify/App build. You can view the workflow run here.

[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.

[github-actions]

🧪🧪 Use the links below to test this adhoc build on Android, iOS, and Web. Happy testing! 🧪🧪
Built from App PR #91702.

Android 🤖	iOS 🍎
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Web 🕸️
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---

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[OSBotify]

🚀 Deployed to staging by https://github.com/Julesssss in version: 9.3.89-1 🚀

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

Bundle Size Analysis (Sentry):

• Android
• iOS

[MelvinBot]

🤖 No help site updates required.

This PR is a web-only animation timing tweak:

• Adds CENTERED_DURATION_IN_WEB: 120 and CENTERED_DURATION_OUT_WEB: 80 constants in src/CONST/index.ts.
• Applies them as defaults for centered modal variants in src/components/Modal/index.tsx.
• Restores a subtle fade-in/out for centered alert modals on web (previously reduced to 1ms in [No QA] Tune web modal, dropdown and RHP animations #90212).

There are no changes to features, button labels, tab names, settings, workflows, or any user-facing behavior that's documented in App/docs/articles. Help site articles describe how features work, not internal animation polish — so nothing under App/docs/articles needs updating for this change.

No draft docs PR was created.