Docs updates for E/A#94093 add Default supplier to Xero export settings

[MelvinBot]

Docs updates for #94093

Adds a Default supplier row to the Xero Set Up Export Settings section of the New Expensify Xero configuration article, documenting the new default-supplier control introduced by #94093 (Vendor matching CC – R4: App, Xero extension).

What changed

• Added one bullet after Xero bank account under Step 2: Set Up Export Settings:

  • Default supplier – Select a supplier to apply to all company card (non-reimbursable) transactions on export to Xero.

This mirrors how the peer accounting integrations already document their equivalent control (QuickBooks Online, Sage Intacct, QuickBooks Desktop, and NetSuite all document a "default vendor" in their export settings). Xero labels this control Default supplier in the UI, matching Xero's "Supplier" terminology, so the label is used verbatim per HELPSITE_NAMING_CONVENTIONS.md.

Scope decision

• The label text (Default supplier) and description are taken from the PR's en.ts string (workspace.xero.defaultSupplier / defaultSupplierDescription).
• I intentionally kept this scoped to the Default supplier export-config row only. The PR also flips the per-expense Vendor → Supplier field label and adds a Supplier picker, but the peer integration articles don't document the per-expense vendor field either, so there's no existing pattern to extend and no natural home for it in this connection-settings article.

⚠️ Important: hold until GA

The R4 feature is gated behind the vendorMatching beta and, per the source PR, is off for every Xero workspace today. Customers cannot see the Default supplier row yet. This article change describes GA behavior with no beta caveat, so it should stay in draft until the vendorMatching beta reaches general availability for Xero (the same GA cutover the source PR defers its Java exporter switch to). Please confirm the timing before merging.

---

@Beamanator, please review the files changed and confirm they reflect the current behavior. Then mark this PR Ready for review.

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[github-actions]

HelpDot Documentation Review

Overall Assessment

This PR adds a single bullet to the "Step 2: Set Up Export Settings" list in the New Expensify Xero configuration article, documenting a new Default supplier export control. The change is small, well-scoped, and consistent with the existing list of export-setting bullets. This review evaluates only the added line.

Scores Summary

• Readability: 9/10 - The new bullet is clear, concise, and action-oriented. It follows the exact pattern of the surrounding bullets (bold label, en-dash, single-sentence description) and reads cleanly.
• AI Readiness: 8/10 - Uses the full UI label verbatim and terminology matching Xero (Supplier), which aids retrieval. It sits under a non-compliant existing top-level heading (Step 2: Set Up Export Settings), but that heading is pre-existing and not part of this diff, so it is not scored against this change.
• Style Compliance: 9/10 - Correct bold formatting on the UI label, sentence case, no quotation marks, no vague/prohibited navigation language. Matches HELPSITE_NAMING_CONVENTIONS.md button/label rules. The parenthetical "(non-reimbursable)" is a helpful clarification consistent with the neighboring "Xero bank account" bullet.

Key Findings

• The added bullet correctly uses the exact UI label Default supplier in bold, per the Core UI Referencing and Button Naming standards.
• Description is deterministic and specific: what it does (apply a supplier), what it applies to (all company card / non-reimbursable transactions), and when (on export to Xero).
• Consistent with peer integration articles (QuickBooks Online, Sage Intacct, NetSuite) that document an equivalent default-vendor control.
• Note (not a defect in this diff): the article uses multiple top-level headings and generic "Step 1/Step 2/Step 3" heading names, which violate the single-title and task-based heading rules in HELP_AUTHORING_GUIDELINES.md. These are pre-existing and outside the scope of this one-line change.
• Non-doc consideration flagged by the author: the feature is gated behind the vendorMatching beta and is off for all Xero workspaces today. The bullet describes GA behavior with no caveat, so timing/draft status should be confirmed before publishing.

Recommendations

• No changes required to the added line for governance compliance. It is ready as written.
• Confirm the beta/GA timing before merging so the documented control is actually visible to customers, or add a brief availability note if published early.
• Optional future cleanup (separate PR): bring the article headings into compliance (single title heading, task-based section headings instead of "Step N").

Files Reviewed

• docs/articles/new-expensify/connections/xero/Configure-Xero.md - One bullet added under Step 2; compliant with naming and formatting standards.

Note: Detailed line-by-line feedback has been provided as inline comments.

[stephanieelliott]

Holding on this as I think it's behind a beta

[m-natarajan]

@stephanieelliott @Beamanator NO QA steps, OK to checkoff this one?

[OSBotify]

🚀 Deployed to staging by https://github.com/stephanieelliott in version: 9.4.73-0 🚀

platform	result
🕸 web 🕸	success ✅
🤖 android 🤖	success ✅
🍎 iOS 🍎	failure ❌

[Beamanator]

@m-natarajan yep for sure 👍

[OSBotify]

🚀 Deployed to production by https://github.com/mountiny in version: 9.4.73-3 🚀

platform	result
🕸 web 🕸	success ✅
🤖 android 🤖	success ✅
🍎 iOS 🍎	success ✅

Bundle Size Analysis (Sentry):

• Android