Fix: header stat counts not updating after bulk-assign or revoke on Contract Admin page

[daniellefrappier18]

What are the relevant tickets?

Description (What does it do?)

The Contract Admin page header shows stat counts (Unassigned, Pending claim, etc.) derived from the contract detail query. Bulk-assigning seats or revoking a code mutates those counts server-side, but the contractDetail query wasn't being invalidated on mutation, so the header stayed stale until a full page refresh.

Screenshots (if appropriate):

• Desktop screenshots
• Mobile width screenshots

counts.mov

How can this be tested?

1. Navigate to a Contract Admin page for an org with an active contract
2. Note the Unassigned and Pending claim counts in the header.
3. Bulk-assign one or more seats via email (paste an email, click Assign Seats, confirm the send)
4. Confirm the header's Unassigned count decreases and Pending claim increases immediately — no manual page refresh needed.
5. From the codes table, open More actions on an assigned-but-unredeemed code and click Release seat (revoke), then confirm.
6. Confirm the header's Unassigned count increases and Pending claim decreases immediately.

Additional Context

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OpenAPI Changes

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[Copilot]

Pull request overview

This PR fixes stale header stat counts on the Contract Admin page by ensuring the contract detail React Query cache is invalidated after mutations that change server-side seat counts (bulk-assign and revoke). This aligns the UI header (Unassigned / Pending claim) with the latest backend state without requiring a full page refresh.

Changes:

• Invalidate the managerOrganizationKeys.contractDetail(...) query after bulk seat assignment and code revocation mutations.
• Add ContractAdminPage tests that simulate post-mutation contract-detail changes and assert header counts update accordingly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
frontends/main/src/app-pages/ContractAdminPage/ContractAdminPage.test.tsx	Adds regression tests verifying header stat counts refresh after bulk-assign and revoke actions.
frontends/api/src/mitxonline/hooks/organizations/index.ts	Invalidates the contract detail query on seat-assign and revoke mutations so the header stats refetch and update.