Fix receipt hover preview opening on the wrong side of the thumbnail

[adamgrzybowski]

Explanation of Change

• Receipt hover preview now prefers opening to the left of the thumbnail, flipping right only when there isn't room on the left.

Fixed Issues

$ #95975
PROPOSAL:

Tests

Offline tests

QA Steps

1. Open a report/spend view that shows expense rows with receipt thumbnails.
2. Hover over a receipt thumbnail that has room to its left and verify the preview opens to the left of the thumbnail.
3. Hover over a receipt thumbnail hugging the left edge of the screen and verify the preview flips to the right, and that a tall receipt near the top stays fully on-screen.

• 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)
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  • 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.
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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)
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
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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.
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• 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 Design label and/or tagged @Expensify/design so the design team can review the changes.
• 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

Screen.Recording.2026-07-17.at.16.23.36.mov

[melvin-bot]

@linhvovan29546 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]

[melvin-bot]

@linhvovan29546 @NikkiWines @grgia One of you needs to 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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[chatgpt-codex-connector]

Keep fallback preview inside the viewport

When the thumbnail is close enough to the left edge that fitsLeft is false but the viewport is only slightly wider than the narrow breakpoint, this fallback can place the 380px preview off the right edge. For example, with windowWidth 801 and a thumbnail at left 400, leftOfThumbnail is 4 so we choose rightOfThumbnail 484, making the preview extend to 864 before the edge margin; the previous overflow check would have clamped it to the left instead. This affects wide layouts just above the mobile breakpoint and clips the hover preview.

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[ZhenjaHorbach]

@linhvovan29546
Sorry
I suppose it's my PR
Since it's came from my project, which I reviewed