Fix flickering lock icon on Consolidated Travel Billing toggle

[allgandalf]

Explanation of Change

The Consolidated Travel Billing toggle showed a lock on load that then flickered off. The lock on mount comes from the toggle being disabled while openPolicyTravelPage is loading, and once the fetch finishes showLockIcon dropped it because it only checked canWriteMoreFeatures and the waitlist, not the outstanding balance. handleToggle already blocks disabling when there is an unpaid balance, so the lock should stay to reflect that.

Added hasOutstandingTravelBalance(travelSettings) to showLockIcon so the lock stays while there is an outstanding balance, same shape the other workspace toggles use (e.g. tags showLockIcon={!canWriteTags || shouldPreventDisableOrDelete}). The toggle stays interactive (not disabled) so tapping it still opens the outstanding balance modal, same as before.

Fixed Issues

$ #94909
PROPOSAL:

Tests

1. Have a workspace with Consolidated Travel Billing enabled that has an outstanding balance (current travel spend > 0, so the Pay balance button shows).
2. Open Workspace settings > Travel.
3. Verify the Consolidated Travel Billing toggle shows a lock icon that stays on and does not flicker off after the page finishes loading.
4. Tap the toggle and verify it stays on and the outstanding balance modal appears (can't turn off until the balance is paid).
5. Pay the balance so the spend is 0, reopen the Travel page, and verify the lock icon is gone and the toggle can be turned off (the disable confirmation modal shows).

• Verify that no errors appear in the JS console

Offline tests

The lock is derived from the Travel Invoicing card settings already in Onyx, so it renders the same offline. Tapping the toggle while a balance is outstanding shows the outstanding balance modal offline too.

QA Steps

Same as tests.

• Verify that no errors appear in the JS console

PR Author Checklist

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Screen.Recording.2026-07-01.at.6.06.49.PM.mov

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@huult @rlinoz @blimpich 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]

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/CONST/index.ts	94.02% <ø> (ø)
src/components/Switch.tsx	94.11% <ø> (ø)
...rkspace/travel/WorkspaceTravelInvoicingSection.tsx	91.61% <66.66%> (+0.05%)	⬆️
... and 14 files with indirect coverage changes

[rlinoz]

Thanks! I really thought that we were gonna need a backend fix here, glad it is a small change.

[rlinoz]

Reviewer Checklist

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  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
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[MelvinBot]

🤖 Help site review: no changes required.

This PR is a UI-only bug fix — the Consolidated Travel Billing toggle showed a lock icon that flickered off on load. The fix keeps showLockIcon on while there's an outstanding travel balance (matching what handleToggle already enforced). It changes when the lock renders, not any user-facing product behavior or naming.

The underlying rule this fix visually reflects is already documented correctly in Enable-Consolidated-Travel-Billing-in-a-Workspace.md:

Can I turn off Consolidated Travel Billing?
Yes, but only if your balance is fully paid. If there is an outstanding balance, you must settle it before disabling the feature.

Since the help site already describes the "can't disable until the balance is paid" behavior, no article changes are needed and no draft docs PR was created.

@allgandalf, please confirm you agree no help site update is required here. If you'd like the lock/outstanding-balance behavior called out more explicitly in the article, let me know and I'll open a draft PR.