Fix Sync modal capping at 20 sites on the Sync modal

[ivan-ottinger]

Related issues

Related issue report: p1777991412633529-slack-C06DRMD6VPZ

How AI was used in this PR

Investigation of the regression and identification of the fix were done with Claude Code. The author reviewed all findings and the diff manually.

Proposed Changes

• Pass perPage: 200 to useGetWpComSitesQuery in the classic Sync modal so the site list isn't silently capped at the 20-per-page default introduced in Redesign site list and Add Site flow with richer sync metadata #3161.

Background

PR #3161 added server-side pagination to getWpComSites in apps/studio/src/stores/sync/wpcom-sites.ts and switched /me/sites from rest/v1.2 (unpaginated) to rest/v1.3 (paginated). The new queryFn defaults to perPage = 20 when no caller overrides it.

The redesigned modal (sync-sites-modal-selector.tsx, behind the enableBlueprintsGallery feature flag) explicitly passes perPage: 100 and wires up server-side search, so users with large accounts can still find sites past the page-1 cap.

The classic modal — the default modal for users without the feature flag — passed no perPage, so it inherited the 20-per-page default. Its search box is client-side only (filters the already-fetched list), so anything past site number 20 became unreachable. Reported in p1777991412633529-slack-C06DRMD6VPZ where a user's account had 20+ WordPress.com sites and the missing site never appeared in the modal nor in client-side search.

Testing Instructions

1. Have access to a WordPress.com account with 20+ atomic/wpcom sites where the 21st site (or beyond) is one you can identify.
2. Run Studio on this branch (npm start).
3. Open a local site → Sync tab → Connect → click to open the site picker.
4. Verify all of your WordPress.com sites appear (not just the first 20).
5. In the Network tab, confirm the /me/sites request now uses per_page=200.
6. Search for the previously-missing site by name in the modal's search box and confirm it appears.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[katinthehatsite]

The changes look good, I can see more than 20 sites in the modal:

Screen.Recording.2026-05-06.at.10.54.07.AM.mov

[wpmobilebot]

📊 Performance Test Results

Comparing 49851d2 vs trunk

app-size

Metric	trunk	49851d2	Diff	Change
App Size (Mac)	1404.87 MB	1404.87 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	49851d2	Diff	Change
load	1504 ms	1505 ms	+1 ms	⚪ 0.0%

site-startup

Metric	trunk	49851d2	Diff	Change
siteCreation	8085 ms	8085 ms	0 ms	⚪ 0.0%
siteStartup	4945 ms	4937 ms	8 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)