feat: extract State taxes card from DashboardFlow into standalone management block

[serikjensen]

Summary

Migrates the State taxes card off the monolithic DashboardFlow path onto the "thin workflow + standalone pieces" pattern established by PaymentMethod / WorkAddress / Paystubs. Continues the strangler-fig migration outlined in .claude/skills/migrate-dashboard-card-to-block/SKILL.md.

Four standalone partner-consumable surfaces under Employee/StateTaxes/

• useStateTaxesSummary — BaseHookReady-shaped data hook in shared/useStateTaxesSummary/.
• StateTaxesCard — self-fetching standalone card in management/StateTaxesCard/. Hides the Edit button when no state has any withholding questions (e.g. a no-income-tax state has nothing to edit).
• StateTaxesEditForm — renamed from the previous management/StateTaxes.tsx, now firing scoped EMPLOYEE_MANAGEMENT_STATE_TAXES_* events. Keeps the form open with an inline success alert on save; cancel returns to the card.
• StateTaxes — robot3-orchestrated block composing the card and edit form for partners who want a single in-place surface.

Dashboard integration

The dashboard composes the pieces (StateTaxesCard + StateTaxesEditForm) directly via its existing state machine; dashboardStateMachine and DashboardComponents are retargeted from EMPLOYEE_STATE_TAXES_EDIT (now removed) onto the new scoped events. useEmployeeTaxes is trimmed to federal-only.

Shared EmployeeStateTaxesView decoupling

Following the same pattern the in-flight Deductions migration uses for DeductionsForm: the shared view now owns a dedicated Employee.StateTaxesView namespace with its own defaults. Onboarding (StateTaxes) and management (StateTaxesEditForm) each ship a flow-local dictionary hook (useOnboardingStateTaxesViewDictionary / useManagementStateTaxesViewDictionary) that resolves the view's keys against the flow's own namespace (Employee.StateTaxes / Employee.Management.StateTaxes). Partner dictionary overrides on either flow propagate into the view without leaking across flows — and the view itself no longer needs callers to dual-load Employee.StateTaxes.

Test plan

• npm run test -- --run — 3028 tests pass (1 expected-fail unchanged).
• npm run lint:check — 0 errors (pre-existing warnings unchanged).
• npm run i18n:generate — types in sync with the new Employee.StateTaxesView and Employee.Management.StateTaxes namespaces.
• npx tsx sdk-app/scripts/analyze-component-props.ts — registry exposes EmployeeManagement.StateTaxes, EmployeeManagement.StateTaxesCard, and EmployeeManagement.StateTaxesEditForm with employeeId as the required entity.
• Spot-check in the SDK dev app: card → Edit emits EMPLOYEE_MANAGEMENT_STATE_TAXES_EDIT_REQUESTED; Save emits EMPLOYEE_MANAGEMENT_STATE_TAXES_UPDATED and shows the inline alert; Cancel emits EMPLOYEE_MANAGEMENT_STATE_TAXES_EDIT_CANCELLED and returns to the card.
• Spot-check the dashboard Taxes tab: clicking the card's Edit routes the dashboard chrome into the edit form; Save / Cancel return to the dashboard tab as before.

Screen.Recording.2026-06-04.at.3.55.56.PM.mov

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