[$250] Add warning when cash splits are less than original expense amount

[garrettmknight]

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Version Number: N/A
Reproducible in staging?: Y
Reproducible in production?: Y
If this was caught during regression testing, add the test name, ID and link from TestRail:
Email or phone of affected tester (no customers):
Logs: https://stackoverflow.com/c/expensify/questions/4856
Expensify/Expensify Issue URL:
Issue reported by: @puneetlath
Slack conversation (hyperlinked to channel name):

Action Performed:

1. Create a cash expense on a workspace
2. Tap 'More' > Split
3. Lower the amount of one of the splits such that the total of the two splits is less than the original expense.

Expected Result:

The user should be warned that their splits are less than the total.

Let's add a warning in this situation:

• The text should read: Total amount is less than the original expense.
• is calculated as original expense amount minus the sum of the existing splits in the table.
• We'll use the exclamation point dot to the left of the message.
• The text color will be grey.

cc @dubielzyk-expensify

Actual Result:

The user is not warned and can save the splits, accidentally lowering the total expense amount.

Workaround:

It's just confusing!

Platforms:

Select the officially supported platforms where the issue was reproduced:
ALL

Platforms Tested:

On which of our officially supported platforms was this issue tested:

ALL

Screenshots/Videos

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Issue Owner

Current Issue Owner: @sonialiap

[melvin-bot]

Triggered auto assignment to @sonialiap (NewFeature), see https://stackoverflowteams.com/c/expensify/questions/14418#:~:text=BugZero%20process%20steps%20for%20feature%20requests for more details. Please add this Feature request to a GH project, as outlined in the SO.

[melvin-bot]

Job added to Upwork: https://www.upwork.com/jobs/~021942521601273273046

[melvin-bot]

Triggered auto assignment to Contributor-plus team member for initial proposal review - @dukenv0307 (External)