Allow $0 as valid card limit when editing Expensify Card

[MelvinBot]

Explanation of Change

Screen.Recording.2026-05-14.at.4.38.17.PM.mov

The validation in DynamicExpensifyCardLimitPage used !Number(values.limit) to check for invalid amounts. Since Number('0') evaluates to 0 which is falsy, a $0 card limit was always rejected as "invalid amount". This prevented admins from editing cards whose limit was set to $0 in Expensify Classic (OldDot).

Changed the check to Number.isNaN(Number(values.limit)) which correctly allows 0 as a valid limit while still rejecting non-numeric input. Empty input is already handled by getFieldRequiredErrors.

Fixed Issues

$ #90487

Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

• Verify that no errors appear in the JS console

1. Navigate to Workspace > Expensify Card
2. Assign or issue virtual card to any member
3. Switch to Expensify Classic (OD), and set the previous assigned Expensify Card's limit to $0
4. Switch back to ND and navigate to Expensify Card. The card with limit $0 appears in the list
5. Open it and try to edit the Card limit
6. Confirm User can navigate to edit limit, edit name, and edit limit type without errors.

Offline tests

N/A — validation is purely client-side with no network dependency.

QA Steps

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".

• Verify that no errors appear in the JS console

PR Author Checklist

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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
...ce/expensifyCard/DynamicExpensifyCardLimitPage.tsx	0.00% <0.00%> (ø)
... and 11 files with indirect coverage changes

[github-actions]

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[github-actions]

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[melvin-bot]

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