Fix inability to mark expenses as billable

[x-dev90]

Explanation of Change

These changes make billable expense behavior consistent across the app by relying on the shared policy-level billable tracking helper instead of checking one raw policy field directly.

The billable field will now appear when billable tracking is actually enabled for the workspace policy, including in expense confirmation and expense detail views. Additionally, when workspace rules are enabled and billable tracking was previously disabled, the app now turns billable tracking back on using the workspace’s existing default billable setting. This helps prevent users from enabling rules while the billable controls remain hidden or out of sync with the policy configuration.

Fixed Issues

$ #88153
PROPOSAL: #88153 (comment)

Tests

1. Go to Workspace > More features and enable Rules.
2. Go to Workspace Chat and create a manual expense.
3. Go to Spend > Reports.
4. Open the expense report that contains the manually created expense.
5. Verify that the user is able to mark the expense as Billable.

• Verify that no errors appear in the JS console

Offline tests

Same as Tests.

QA Steps

Same as Tests.

// TODO: These must be filled out, or the issue title must include "[No QA]."

• 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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Screenshots/Videos

Android: Native

REC-2026050233354.AM.mp4

Android: mWeb Chrome

REC-2026050234232.AM.mp4

iOS: Native

REC-2026050234933.AM.mp4

iOS: mWeb Safari

REC-2026050235139.AM.mp4

MacOS: Chrome / Safari

Screen.Recording.2026-05-02.at.3.21.31.AM.mov

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