[No QA] Tune web modal, dropdown and RHP animations

[adhorodyski]

Explanation of Change

Web-only performance and feel pass on three surfaces:

• Modals (Modal component) — open/close timings reduced to 1ms via Platform-keyed defaults.
• Dropdowns (Popover / PopoverMenu) — ANIMATED_TRANSITION reduced to 1ms on web.
• RHP transitions (outer open + nested screen pushes) — replaced the full-screen-width slide with a short hint: 60px translateX + opacity 0→1 over 150ms on open and 100ms on close.

To deliver the RHP animation without bolting an RHP-specific flag onto the existing modal helper, useModalCardStyleInterpolator.ts was refactored: the 7 boolean props collapsed into a single enter: EnterAnimation discriminated union (slide-and-fade, slide-from-width, fade, none) plus applySidePanelOffset. All 8 call sites were updated; layout-context decisions (shouldUseNarrowLayout, animationEnabled) now live at the call site where they belong.

Native (iOS/Android) timings and animations are unchanged — every modification is gated by Platform.OS === 'web' or lives inside a web: block / web-only entry point.

Fixed Issues

$ #90146
PROPOSAL:

Tests

• Verify that no errors appear in the JS console

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
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  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[github-actions]

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[github-actions]

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

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[github-actions]

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

[dannymcclain]

Feeling good to me! Will let @Expensify/design get a last look too

[shawnborton]

Everything feels good to me... except the centered alert modals. I wonder if we should have them do a very slight fade in? Otherwise it feels slightly too abrupt. I do NOT feel strongly about this though.

CleanShot.2026-05-21.at.16.02.52.mp4

[dannymcclain]

Oh yeah I agree with that - I missed those when I was cruising through. Those do feel pretty abrupt. But it's not a total deal breaker to me.

[adhorodyski]

I think it's totally ok to do a little followup on this given this PR is pretty advanced in, we can work on a small fade there.

[shawnborton]

Totally, that works for me 👍

[github-actions]

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

[github-actions]

🧪🧪 Use the links below to test this adhoc build on Android, iOS, and Web. Happy testing! 🧪🧪
Built from App PR #90212.

Android 🤖	iOS 🍎
https://ad-hoc-expensify-cash.s3.us-east-1.amazonaws.com/rock-artifacts/ad-hoc/rock-android-Adhoc-18011e0-fdf8a2c-5e7c0434144e798272a0ed8d1325b8e7651cca29/index.html	https://ad-hoc-expensify-cash.s3.us-east-1.amazonaws.com/rock-artifacts/ad-hoc/rock-ios-device-AdHoc-18011e0-fdf8a2c-aa8900a6f1265a5b311c560613bdf2f375c98d72/index.html

Web 🕸️
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---

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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.

[OSBotify]

🚀 Deployed to staging by https://github.com/Julesssss in version: 9.3.79-1 🚀

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

Bundle Size Analysis (Sentry):

• Android
• iOS

[MelvinBot]

I reviewed all changes in this PR. This is a web-only animation performance pass that adjusts internal timing constants and refactors the modal card style interpolator. No user-facing features, settings, workflows, or terminology were changed.

No help site updates are required.

[dubielzyk-expensify]

Not sure if it's due to this PR, but the regular nav stack animation on Workspaces is weird as the whole thing navigates over to the left. Instead I expect it to work like the second interaction where it moves over the content like a sheet.

CleanShot.2026-05-22.at.09.42.14.mp4

If we do this RHP animation on mobile it also means we have an inconsistency of animation cause you have a full move from right to left on a regular navigation change, then for the RHP it kinda fades. It looks a bit weird in practise:

CleanShot.2026-05-22.at.09.43.18.mp4

I'd expect this to be desktop only as we didn't have any problems with this on mobile.

[mitarachim]

Deploy Blocker #91382 was identified to be related to this PR.

[OSBotify]

🚀 Deployed to production by https://github.com/roryabraham in version: 9.3.79-4 🚀

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

[adhorodyski]

@dubielzyk-expensify I will look into this on tomorrow! Wrapping up #90212 (comment) now.

[adhorodyski]

Everything feels good to me... except the centered alert modals. I wonder if we should have them do a very slight fade in? Otherwise it feels slightly too abrupt. I do NOT feel strongly about this though.

CleanShot.2026-05-21.at.16.02.52.mp4

@shawnborton I just opened a followup here #91702

[shawnborton]

Thanks, see you over there!