Fix invoice fields collision, downgrade, and copy root causes

[ShridharGoel]

Explanation of Change

Fixes root causes across three related invoice fields issues:

1. #100876: Keyed field duplicate name validation error off colliding field target instead of current form target.
2. #100878: Gated invoice fields toggle and sub-page route access using canPolicyAccessFeature so downgraded Collect workspaces do not keep invoice fields enabled or accessible.
3. #100879: Included enabled invoice fields state (isInvoiceFieldsEnabled) in copy settings hasInvoiceConfiguration so the Invoices setting is presented when invoice fields are enabled with 0 fields created.

Fixed Issues

$ #100876
$ #100878
$ #100879

Tests

1. Field collision message (Invoices - Wrong error message when creating invoice field with the same name as report field #100876):

   • Go to Workspace settings > Reports > Add field. Create a text report field named PO Number.
   • Go to Workspace settings > Invoices > Add field > Name.
   • Enter PO Number.
   • Verify error displays: "A report field with this name already exists".
   • Create an invoice field named Client Ref.
   • Go to Workspace settings > Reports > Add field > Name.
   • Enter Client Ref.
   • Verify error displays: "An invoice field with this name already exists".

2. Downgrade to Collect (Invoices - Invoice fields remain enabled after downgrading workspace to Collect #100878):

   • Create a Collect workspace.
   • Enable Invoices, then go to Invoices and enable Invoice fields (upgrading to Control).
   • Go to Overview > Plan type and downgrade back to Collect.
   • Go to Invoices and scroll to Invoice fields.
   • Verify the Invoice fields toggle is disabled (off) and no fields/add button are visible.
   • Navigate directly to invoice fields create URL (e.g. /settings/workspaces/:policyID/invoices/fields/new).
   • Verify access is denied / redirects to not found.

3. Copy settings visibility (Invoices - No option to copy settings when invoice fields are enabled without invoice fields #100879):

   • Create two Control workspaces A and B. Enable Invoices on both.
   • On workspace A, enable Invoice fields but do not add any fields. Do not add a bank account or invoice company details.
   • On workspace B, keep Invoice fields disabled.
   • Open workspace A 3-dot menu > Copy settings > select workspace B > Next.
   • Verify the Invoices row is present in the list of features to copy.

• Verify that no errors appear in the JS console

Offline tests

Same as tests above.

QA Steps

Same as tests.

• 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
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Screenshots / Videos

Web

Screen.Recording.2026-09-18.at.2.38.32.AM.mov

Screen.Recording.2026-09-18.at.2.34.12.AM.mov

Screen.Recording.2026-09-18.at.2.36.53.AM.mov

[codecov]

Codecov Report

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

Files with missing lines	Coverage Δ
src/libs/CopyPolicySettingsUtils.ts	87.42% <100.00%> (ø)
src/libs/PolicyUtils.ts	81.92% <100.00%> (+0.05%)	⬆️
src/libs/WorkspaceReportFieldUtils.ts	72.82% <100.00%> (+3.93%)	⬆️
...ySettings/CopyPolicySettingsSelectFeaturesPage.tsx	80.24% <100.00%> (ø)
...rkspace/invoices/WorkspaceInvoiceFieldsSection.tsx	0.00% <0.00%> (ø)
src/pages/workspace/fields/CreateFieldsPage.tsx	0.00% <0.00%> (ø)
... and 12 files with indirect coverage changes

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